CINXE.COM

<!DOCTYPE html> <html dir="ltr" lang="en-US" prefix="og: https://ogp.me/ns#"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="profile" href="http://gmpg.org/xfn/11"> <link rel="pingback" href="https://platypus.asn.au/xmlrpc.php"> <title>Improving platypus passage: weirs and fishways - Australian Platypus Conservancy</title> <script type="text/javascript"> WebFontConfig = {"google":{"families":["Lato:r:latin,latin-ext","Lato:r,i,b,bi:latin,latin-ext"]},"api_url":"https:\/\/fonts-api.wp.com\/css"}; (function() { var wf = document.createElement('script'); wf.src = 'https://platypus.asn.au/wp-content/mu-plugins/wpcomsh/vendor/automattic/custom-fonts/js/webfont.js'; wf.type = 'text/javascript'; wf.async = 'true'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(wf, s); })(); </script><style id="jetpack-custom-fonts-css">.wf-active body{font-family:"Lato",sans-serif}.wf-active input[type="color"], .wf-active input[type="date"], .wf-active input[type="datetime"], .wf-active input[type="datetime-local"], .wf-active input[type="email"], .wf-active input[type="month"], .wf-active input[type="number"], .wf-active input[type="password"], .wf-active input[type="search"], .wf-active input[type="tel"], .wf-active input[type="text"], .wf-active input[type="time"], .wf-active input[type="url"], .wf-active input[type="week"], .wf-active textarea{font-family:"Lato",sans-serif}.wf-active h1, .wf-active h2, .wf-active h3, .wf-active h4, .wf-active h5, .wf-active h6{font-family:"Lato",sans-serif;font-weight:400;font-style:normal}.wf-active h1 small, .wf-active h2 small, .wf-active h3 small, .wf-active h4 small, .wf-active h5 small, .wf-active h6 small{font-style:normal;font-weight:400}.wf-active h1{font-style:normal;font-weight:400}.wf-active h2{font-style:normal;font-weight:400}.wf-active h3{font-style:normal;font-weight:400}.wf-active h4{font-style:normal;font-weight:400}.wf-active h5{font-style:normal;font-weight:400}.wf-active h6{font-style:normal;font-weight:400}.wf-active .subtitle{font-weight:400;font-style:normal}.wf-active .site-description{font-style:normal;font-weight:400}.wf-active .hero-section .hero-title{font-weight:400;font-style:normal}.wf-active .home-posts-titles h2{font-weight:400;font-style:normal}.wf-active .featured-posts .entry-title{font-style:normal;font-weight:400}.wf-active .error-404 .page-title{font-style:normal;font-weight:400}.wf-active .error-404 .widget-title, .wf-active .error-404 .widgettitle{font-style:normal;font-weight:400}.wf-active .page-title{font-style:normal;font-weight:400}.wf-active .comment-reply-title{font-style:normal;font-weight:400}.wf-active .widget-title{font-style:normal;font-weight:400}@media screen and (min-width: 50em){.wf-active h1{font-style:normal;font-weight:400}}@media screen and (min-width: 50em){.wf-active h2{font-style:normal;font-weight:400}}@media screen and (min-width: 50em){.wf-active h3{font-style:normal;font-weight:400}}@media screen and (min-width: 50em){.wf-active h4{font-style:normal;font-weight:400}}@media screen and (min-width: 50em){.wf-active h5{font-style:normal;font-weight:400}}@media screen and (min-width: 50em){.wf-active h6{font-style:normal;font-weight:400}}@media screen and (min-width: 50em){.wf-active .home-posts-titles h2{font-style:normal;font-weight:400}}</style> <style>img:is([sizes="auto" i], [sizes^="auto," i]) { contain-intrinsic-size: 3000px 1500px }</style>  <meta name="description" content="It is known from live-trapping studies that a platypus can travel both upstream and downstream past sizable waterfalls as exemplified by Mackenzie Falls in Grampians National Park, which is more than 30 metres high (shown below at left) (Griffiths and Weeks 2010). This indicates that natural waterfalls are unlikely to prevent a platypus from bypassing" /> <meta name="robots" content="max-image-preview:large" /> <link rel="canonical" href="https://platypus.asn.au/weir-walls-and-fishways/" /> <meta name="generator" content="All in One SEO (AIOSEO) 4.7.9.1" /> <meta property="og:locale" content="en_US" /> <meta property="og:site_name" content="Australian Platypus Conservancy - Australian Platypus Conservancy" /> <meta property="og:type" content="article" /> <meta property="og:title" content="Improving platypus passage: weirs and fishways - Australian Platypus Conservancy" /> <meta property="og:description" content="It is known from live-trapping studies that a platypus can travel both upstream and downstream past sizable waterfalls as exemplified by Mackenzie Falls in Grampians National Park, which is more than 30 metres high (shown below at left) (Griffiths and Weeks 2010). This indicates that natural waterfalls are unlikely to prevent a platypus from bypassing" /> <meta property="og:url" content="https://platypus.asn.au/weir-walls-and-fishways/" /> <meta property="article:published_time" content="2021-06-28T03:30:22+00:00" /> <meta property="article:modified_time" content="2024-05-15T01:06:10+00:00" /> <meta name="twitter:card" content="summary_large_image" /> <meta name="twitter:title" content="Improving platypus passage: weirs and fishways - Australian Platypus Conservancy" /> <meta name="twitter:description" content="It is known from live-trapping studies that a platypus can travel both upstream and downstream past sizable waterfalls as exemplified by Mackenzie Falls in Grampians National Park, which is more than 30 metres high (shown below at left) (Griffiths and Weeks 2010). This indicates that natural waterfalls are unlikely to prevent a platypus from bypassing" /> <script type="application/ld+json" class="aioseo-schema"> {"@context":"https:\/\/schema.org","@graph":[{"@type":"BreadcrumbList","@id":"https:\/\/platypus.asn.au\/weir-walls-and-fishways\/#breadcrumblist","itemListElement":[{"@type":"ListItem","@id":"https:\/\/platypus.asn.au\/#listItem","position":1,"name":"Home","item":"https:\/\/platypus.asn.au\/","nextItem":{"@type":"ListItem","@id":"https:\/\/platypus.asn.au\/weir-walls-and-fishways\/#listItem","name":"Improving platypus passage: weirs and fishways"}},{"@type":"ListItem","@id":"https:\/\/platypus.asn.au\/weir-walls-and-fishways\/#listItem","position":2,"name":"Improving platypus passage: weirs and fishways","previousItem":{"@type":"ListItem","@id":"https:\/\/platypus.asn.au\/#listItem","name":"Home"}}]},{"@type":"Organization","@id":"https:\/\/platypus.asn.au\/#organization","name":"Australian Platypus Conservancy","description":"Australian Platypus Conservancy","url":"https:\/\/platypus.asn.au\/"},{"@type":"WebPage","@id":"https:\/\/platypus.asn.au\/weir-walls-and-fishways\/#webpage","url":"https:\/\/platypus.asn.au\/weir-walls-and-fishways\/","name":"Improving platypus passage: weirs and fishways - Australian Platypus Conservancy","description":"It is known from live-trapping studies that a platypus can travel both upstream and downstream past sizable waterfalls as exemplified by Mackenzie Falls in Grampians National Park, which is more than 30 metres high (shown below at left) (Griffiths and Weeks 2010). This indicates that natural waterfalls are unlikely to prevent a platypus from bypassing","inLanguage":"en-US","isPartOf":{"@id":"https:\/\/platypus.asn.au\/#website"},"breadcrumb":{"@id":"https:\/\/platypus.asn.au\/weir-walls-and-fishways\/#breadcrumblist"},"datePublished":"2021-06-28T13:30:22+10:00","dateModified":"2024-05-15T11:06:10+10:00"},{"@type":"WebSite","@id":"https:\/\/platypus.asn.au\/#website","url":"https:\/\/platypus.asn.au\/","name":"Australian Platypus Conservancy","description":"Australian Platypus Conservancy","inLanguage":"en-US","publisher":{"@id":"https:\/\/platypus.asn.au\/#organization"}}]} </script>  <link rel='dns-prefetch' href='//secure.gravatar.com' /> <link rel='dns-prefetch' href='//stats.wp.com' /> <link rel='dns-prefetch' href='//fonts-api.wp.com' /> <link rel='dns-prefetch' href='//widgets.wp.com' /> <link rel='dns-prefetch' href='//jetpack.wordpress.com' /> <link rel='dns-prefetch' href='//s0.wp.com' /> <link rel='dns-prefetch' href='//public-api.wordpress.com' /> <link rel='dns-prefetch' href='//0.gravatar.com' /> <link rel='dns-prefetch' href='//1.gravatar.com' /> <link rel='dns-prefetch' href='//2.gravatar.com' /> <link rel='preconnect' href='//i0.wp.com' /> <link rel='preconnect' href='//c0.wp.com' /> <link rel="alternate" type="application/rss+xml" title="Australian Platypus Conservancy » Feed" href="https://platypus.asn.au/feed/" /> <link rel="alternate" type="application/rss+xml" title="Australian Platypus Conservancy » Comments Feed" href="https://platypus.asn.au/comments/feed/" /> <script type="text/javascript"> /* <![CDATA[ */ window._wpemojiSettings = {"baseUrl":"https:\/\/s.w.org\/images\/core\/emoji\/15.0.3\/72x72\/","ext":".png","svgUrl":"https:\/\/s.w.org\/images\/core\/emoji\/15.0.3\/svg\/","svgExt":".svg","source":{"concatemoji":"https:\/\/platypus.asn.au\/wp-includes\/js\/wp-emoji-release.min.js?ver=6.7.2"}}; /*! This file is auto-generated */ !function(i,n){var o,s,e;function c(e){try{var t={supportTests:e,timestamp:(new Date).valueOf()};sessionStorage.setItem(o,JSON.stringify(t))}catch(e){}}function p(e,t,n){e.clearRect(0,0,e.canvas.width,e.canvas.height),e.fillText(t,0,0);var t=new Uint32Array(e.getImageData(0,0,e.canvas.width,e.canvas.height).data),r=(e.clearRect(0,0,e.canvas.width,e.canvas.height),e.fillText(n,0,0),new Uint32Array(e.getImageData(0,0,e.canvas.width,e.canvas.height).data));return t.every(function(e,t){return e===r[t]})}function u(e,t,n){switch(t){case"flag":return n(e,"\ud83c\udff3\ufe0f\u200d\u26a7\ufe0f","\ud83c\udff3\ufe0f\u200b\u26a7\ufe0f")?!1:!n(e,"\ud83c\uddfa\ud83c\uddf3","\ud83c\uddfa\u200b\ud83c\uddf3")&&!n(e,"\ud83c\udff4\udb40\udc67\udb40\udc62\udb40\udc65\udb40\udc6e\udb40\udc67\udb40\udc7f","\ud83c\udff4\u200b\udb40\udc67\u200b\udb40\udc62\u200b\udb40\udc65\u200b\udb40\udc6e\u200b\udb40\udc67\u200b\udb40\udc7f");case"emoji":return!n(e,"\ud83d\udc26\u200d\u2b1b","\ud83d\udc26\u200b\u2b1b")}return!1}function f(e,t,n){var r="undefined"!=typeof WorkerGlobalScope&&self instanceof WorkerGlobalScope?new OffscreenCanvas(300,150):i.createElement("canvas"),a=r.getContext("2d",{willReadFrequently:!0}),o=(a.textBaseline="top",a.font="600 32px Arial",{});return e.forEach(function(e){o[e]=t(a,e,n)}),o}function t(e){var t=i.createElement("script");t.src=e,t.defer=!0,i.head.appendChild(t)}"undefined"!=typeof Promise&&(o="wpEmojiSettingsSupports",s=["flag","emoji"],n.supports={everything:!0,everythingExceptFlag:!0},e=new Promise(function(e){i.addEventListener("DOMContentLoaded",e,{once:!0})}),new Promise(function(t){var n=function(){try{var e=JSON.parse(sessionStorage.getItem(o));if("object"==typeof e&&"number"==typeof e.timestamp&&(new Date).valueOf()<e.timestamp+604800&&"object"==typeof e.supportTests)return e.supportTests}catch(e){}return null}();if(!n){if("undefined"!=typeof Worker&&"undefined"!=typeof OffscreenCanvas&&"undefined"!=typeof URL&&URL.createObjectURL&&"undefined"!=typeof Blob)try{var e="postMessage("+f.toString()+"("+[JSON.stringify(s),u.toString(),p.toString()].join(",")+"));",r=new Blob([e],{type:"text/javascript"}),a=new Worker(URL.createObjectURL(r),{name:"wpTestEmojiSupports"});return void(a.onmessage=function(e){c(n=e.data),a.terminate(),t(n)})}catch(e){}c(n=f(s,u,p))}t(n)}).then(function(e){for(var t in e)n.supports[t]=e[t],n.supports.everything=n.supports.everything&&n.supports[t],"flag"!==t&&(n.supports.everythingExceptFlag=n.supports.everythingExceptFlag&&n.supports[t]);n.supports.everythingExceptFlag=n.supports.everythingExceptFlag&&!n.supports.flag,n.DOMReady=!1,n.readyCallback=function(){n.DOMReady=!0}}).then(function(){return e}).then(function(){var e;n.supports.everything||(n.readyCallback(),(e=n.source||{}).concatemoji?t(e.concatemoji):e.wpemoji&&e.twemoji&&(t(e.twemoji),t(e.wpemoji)))}))}((window,document),window._wpemojiSettings); /* ]]> */ </script> <link rel='stylesheet' id='all-css-c19939fae0fdc6de59ab4ba5b5a93125' href='https://platypus.asn.au/_static/??-eJydktFOwzAMRX+ILJsGGi+Il0l8AB+AssRk3pI4qhNK/x63ZWgrVEN7ixMf33vltFlZSgVS0TlUj4l1MB3VonyDTnPpAiws812bFSYbqgPWB9YRHBoIEHvyvMiCQ6MCeGO7RcR0lZa38/qcmVqztAtkj6wdchnNqdOdWt1Ewaf0MlLim3CTMJoi+JSOVZ0GtNlS5L3+gOSo0aYWEqag1UXUx/CqReehqGG8aLJg403fM2fNVyl30Hi9qxicWI2ZknTw5eZmI/0sZQtZ3EGyKMULbY1znX4dzYyzgynAv5yUvSxNjMhja7q/VSc979T76xP2J2VaYIqzVg9QsrFHHcnV3kzAI8ykm+hItu9tDQv4rwDvTQNuyN8fMflr5NugRBZNUIE88UVx+s/P8Wm1uV8+bB7Xy/UXMkhUOw==' type='text/css' media='all' /> <style id='gateway-parent-styles-inline-css'> .byline { clip: rect(1px, 1px, 1px, 1px); height: 1px; position: absolute; overflow: hidden; width: 1px; } </style> <style id='wp-emoji-styles-inline-css'> img.wp-smiley, img.emoji { display: inline !important; border: none !important; box-shadow: none !important; height: 1em !important; width: 1em !important; margin: 0 0.07em !important; vertical-align: -0.1em !important; background: none !important; padding: 0 !important; } </style> <style id='jetpack-sharing-buttons-style-inline-css'> .jetpack-sharing-buttons__services-list{display:flex;flex-direction:row;flex-wrap:wrap;gap:0;list-style-type:none;margin:5px;padding:0}.jetpack-sharing-buttons__services-list.has-small-icon-size{font-size:12px}.jetpack-sharing-buttons__services-list.has-normal-icon-size{font-size:16px}.jetpack-sharing-buttons__services-list.has-large-icon-size{font-size:24px}.jetpack-sharing-buttons__services-list.has-huge-icon-size{font-size:36px}@media print{.jetpack-sharing-buttons__services-list{display:none!important}}.editor-styles-wrapper .wp-block-jetpack-sharing-buttons{gap:0;padding-inline-start:0}ul.jetpack-sharing-buttons__services-list.has-background{padding:1.25em 2.375em} </style> <style id='global-styles-inline-css'> :root{--wp--preset--aspect-ratio--square: 1;--wp--preset--aspect-ratio--4-3: 4/3;--wp--preset--aspect-ratio--3-4: 3/4;--wp--preset--aspect-ratio--3-2: 3/2;--wp--preset--aspect-ratio--2-3: 2/3;--wp--preset--aspect-ratio--16-9: 16/9;--wp--preset--aspect-ratio--9-16: 9/16;--wp--preset--color--black: #000000;--wp--preset--color--cyan-bluish-gray: #abb8c3;--wp--preset--color--white: #ffffff;--wp--preset--color--pale-pink: #f78da7;--wp--preset--color--vivid-red: #cf2e2e;--wp--preset--color--luminous-vivid-orange: #ff6900;--wp--preset--color--luminous-vivid-amber: #fcb900;--wp--preset--color--light-green-cyan: #7bdcb5;--wp--preset--color--vivid-green-cyan: #00d084;--wp--preset--color--pale-cyan-blue: #8ed1fc;--wp--preset--color--vivid-cyan-blue: #0693e3;--wp--preset--color--vivid-purple: #9b51e0;--wp--preset--gradient--vivid-cyan-blue-to-vivid-purple: linear-gradient(135deg,rgba(6,147,227,1) 0%,rgb(155,81,224) 100%);--wp--preset--gradient--light-green-cyan-to-vivid-green-cyan: linear-gradient(135deg,rgb(122,220,180) 0%,rgb(0,208,130) 100%);--wp--preset--gradient--luminous-vivid-amber-to-luminous-vivid-orange: linear-gradient(135deg,rgba(252,185,0,1) 0%,rgba(255,105,0,1) 100%);--wp--preset--gradient--luminous-vivid-orange-to-vivid-red: linear-gradient(135deg,rgba(255,105,0,1) 0%,rgb(207,46,46) 100%);--wp--preset--gradient--very-light-gray-to-cyan-bluish-gray: linear-gradient(135deg,rgb(238,238,238) 0%,rgb(169,184,195) 100%);--wp--preset--gradient--cool-to-warm-spectrum: linear-gradient(135deg,rgb(74,234,220) 0%,rgb(151,120,209) 20%,rgb(207,42,186) 40%,rgb(238,44,130) 60%,rgb(251,105,98) 80%,rgb(254,248,76) 100%);--wp--preset--gradient--blush-light-purple: linear-gradient(135deg,rgb(255,206,236) 0%,rgb(152,150,240) 100%);--wp--preset--gradient--blush-bordeaux: linear-gradient(135deg,rgb(254,205,165) 0%,rgb(254,45,45) 50%,rgb(107,0,62) 100%);--wp--preset--gradient--luminous-dusk: linear-gradient(135deg,rgb(255,203,112) 0%,rgb(199,81,192) 50%,rgb(65,88,208) 100%);--wp--preset--gradient--pale-ocean: linear-gradient(135deg,rgb(255,245,203) 0%,rgb(182,227,212) 50%,rgb(51,167,181) 100%);--wp--preset--gradient--electric-grass: linear-gradient(135deg,rgb(202,248,128) 0%,rgb(113,206,126) 100%);--wp--preset--gradient--midnight: linear-gradient(135deg,rgb(2,3,129) 0%,rgb(40,116,252) 100%);--wp--preset--font-size--small: 13px;--wp--preset--font-size--medium: 20px;--wp--preset--font-size--large: 36px;--wp--preset--font-size--x-large: 42px;--wp--preset--font-family--albert-sans: 'Albert Sans', sans-serif;--wp--preset--font-family--alegreya: Alegreya, serif;--wp--preset--font-family--arvo: Arvo, serif;--wp--preset--font-family--bodoni-moda: 'Bodoni Moda', serif;--wp--preset--font-family--bricolage-grotesque: 'Bricolage Grotesque', sans-serif;--wp--preset--font-family--cabin: Cabin, sans-serif;--wp--preset--font-family--chivo: Chivo, sans-serif;--wp--preset--font-family--commissioner: Commissioner, sans-serif;--wp--preset--font-family--cormorant: Cormorant, serif;--wp--preset--font-family--courier-prime: 'Courier Prime', monospace;--wp--preset--font-family--crimson-pro: 'Crimson Pro', serif;--wp--preset--font-family--dm-mono: 'DM Mono', monospace;--wp--preset--font-family--dm-sans: 'DM Sans', sans-serif;--wp--preset--font-family--dm-serif-display: 'DM Serif Display', serif;--wp--preset--font-family--domine: Domine, serif;--wp--preset--font-family--eb-garamond: 'EB Garamond', serif;--wp--preset--font-family--epilogue: Epilogue, sans-serif;--wp--preset--font-family--fahkwang: Fahkwang, sans-serif;--wp--preset--font-family--figtree: Figtree, sans-serif;--wp--preset--font-family--fira-sans: 'Fira Sans', sans-serif;--wp--preset--font-family--fjalla-one: 'Fjalla One', sans-serif;--wp--preset--font-family--fraunces: Fraunces, serif;--wp--preset--font-family--gabarito: Gabarito, system-ui;--wp--preset--font-family--ibm-plex-mono: 'IBM Plex Mono', monospace;--wp--preset--font-family--ibm-plex-sans: 'IBM Plex Sans', sans-serif;--wp--preset--font-family--ibarra-real-nova: 'Ibarra Real Nova', serif;--wp--preset--font-family--instrument-serif: 'Instrument Serif', serif;--wp--preset--font-family--inter: Inter, sans-serif;--wp--preset--font-family--josefin-sans: 'Josefin Sans', sans-serif;--wp--preset--font-family--jost: Jost, sans-serif;--wp--preset--font-family--libre-baskerville: 'Libre Baskerville', serif;--wp--preset--font-family--libre-franklin: 'Libre Franklin', sans-serif;--wp--preset--font-family--literata: Literata, serif;--wp--preset--font-family--lora: Lora, serif;--wp--preset--font-family--merriweather: Merriweather, serif;--wp--preset--font-family--montserrat: Montserrat, sans-serif;--wp--preset--font-family--newsreader: Newsreader, serif;--wp--preset--font-family--noto-sans-mono: 'Noto Sans Mono', sans-serif;--wp--preset--font-family--nunito: Nunito, sans-serif;--wp--preset--font-family--open-sans: 'Open Sans', sans-serif;--wp--preset--font-family--overpass: Overpass, sans-serif;--wp--preset--font-family--pt-serif: 'PT Serif', serif;--wp--preset--font-family--petrona: Petrona, serif;--wp--preset--font-family--piazzolla: Piazzolla, serif;--wp--preset--font-family--playfair-display: 'Playfair Display', serif;--wp--preset--font-family--plus-jakarta-sans: 'Plus Jakarta Sans', sans-serif;--wp--preset--font-family--poppins: Poppins, sans-serif;--wp--preset--font-family--raleway: Raleway, sans-serif;--wp--preset--font-family--roboto: Roboto, sans-serif;--wp--preset--font-family--roboto-slab: 'Roboto Slab', serif;--wp--preset--font-family--rubik: Rubik, sans-serif;--wp--preset--font-family--rufina: Rufina, serif;--wp--preset--font-family--sora: Sora, sans-serif;--wp--preset--font-family--source-sans-3: 'Source Sans 3', sans-serif;--wp--preset--font-family--source-serif-4: 'Source Serif 4', serif;--wp--preset--font-family--space-mono: 'Space Mono', monospace;--wp--preset--font-family--syne: Syne, sans-serif;--wp--preset--font-family--texturina: Texturina, serif;--wp--preset--font-family--urbanist: Urbanist, sans-serif;--wp--preset--font-family--work-sans: 'Work Sans', sans-serif;--wp--preset--spacing--20: 0.44rem;--wp--preset--spacing--30: 0.67rem;--wp--preset--spacing--40: 1rem;--wp--preset--spacing--50: 1.5rem;--wp--preset--spacing--60: 2.25rem;--wp--preset--spacing--70: 3.38rem;--wp--preset--spacing--80: 5.06rem;--wp--preset--shadow--natural: 6px 6px 9px rgba(0, 0, 0, 0.2);--wp--preset--shadow--deep: 12px 12px 50px rgba(0, 0, 0, 0.4);--wp--preset--shadow--sharp: 6px 6px 0px rgba(0, 0, 0, 0.2);--wp--preset--shadow--outlined: 6px 6px 0px -3px rgba(255, 255, 255, 1), 6px 6px rgba(0, 0, 0, 1);--wp--preset--shadow--crisp: 6px 6px 0px rgba(0, 0, 0, 1);}:where(.is-layout-flex){gap: 0.5em;}:where(.is-layout-grid){gap: 0.5em;}body .is-layout-flex{display: flex;}.is-layout-flex{flex-wrap: wrap;align-items: center;}.is-layout-flex > :is(*, div){margin: 0;}body .is-layout-grid{display: grid;}.is-layout-grid > :is(*, div){margin: 0;}:where(.wp-block-columns.is-layout-flex){gap: 2em;}:where(.wp-block-columns.is-layout-grid){gap: 2em;}:where(.wp-block-post-template.is-layout-flex){gap: 1.25em;}:where(.wp-block-post-template.is-layout-grid){gap: 1.25em;}.has-black-color{color: var(--wp--preset--color--black) !important;}.has-cyan-bluish-gray-color{color: var(--wp--preset--color--cyan-bluish-gray) !important;}.has-white-color{color: var(--wp--preset--color--white) !important;}.has-pale-pink-color{color: var(--wp--preset--color--pale-pink) !important;}.has-vivid-red-color{color: var(--wp--preset--color--vivid-red) !important;}.has-luminous-vivid-orange-color{color: var(--wp--preset--color--luminous-vivid-orange) !important;}.has-luminous-vivid-amber-color{color: var(--wp--preset--color--luminous-vivid-amber) !important;}.has-light-green-cyan-color{color: var(--wp--preset--color--light-green-cyan) !important;}.has-vivid-green-cyan-color{color: var(--wp--preset--color--vivid-green-cyan) !important;}.has-pale-cyan-blue-color{color: var(--wp--preset--color--pale-cyan-blue) !important;}.has-vivid-cyan-blue-color{color: var(--wp--preset--color--vivid-cyan-blue) !important;}.has-vivid-purple-color{color: var(--wp--preset--color--vivid-purple) !important;}.has-black-background-color{background-color: var(--wp--preset--color--black) !important;}.has-cyan-bluish-gray-background-color{background-color: var(--wp--preset--color--cyan-bluish-gray) !important;}.has-white-background-color{background-color: var(--wp--preset--color--white) !important;}.has-pale-pink-background-color{background-color: var(--wp--preset--color--pale-pink) !important;}.has-vivid-red-background-color{background-color: var(--wp--preset--color--vivid-red) !important;}.has-luminous-vivid-orange-background-color{background-color: var(--wp--preset--color--luminous-vivid-orange) !important;}.has-luminous-vivid-amber-background-color{background-color: var(--wp--preset--color--luminous-vivid-amber) !important;}.has-light-green-cyan-background-color{background-color: var(--wp--preset--color--light-green-cyan) !important;}.has-vivid-green-cyan-background-color{background-color: var(--wp--preset--color--vivid-green-cyan) !important;}.has-pale-cyan-blue-background-color{background-color: var(--wp--preset--color--pale-cyan-blue) !important;}.has-vivid-cyan-blue-background-color{background-color: var(--wp--preset--color--vivid-cyan-blue) !important;}.has-vivid-purple-background-color{background-color: var(--wp--preset--color--vivid-purple) !important;}.has-black-border-color{border-color: var(--wp--preset--color--black) !important;}.has-cyan-bluish-gray-border-color{border-color: var(--wp--preset--color--cyan-bluish-gray) !important;}.has-white-border-color{border-color: var(--wp--preset--color--white) !important;}.has-pale-pink-border-color{border-color: var(--wp--preset--color--pale-pink) !important;}.has-vivid-red-border-color{border-color: var(--wp--preset--color--vivid-red) !important;}.has-luminous-vivid-orange-border-color{border-color: var(--wp--preset--color--luminous-vivid-orange) !important;}.has-luminous-vivid-amber-border-color{border-color: var(--wp--preset--color--luminous-vivid-amber) !important;}.has-light-green-cyan-border-color{border-color: var(--wp--preset--color--light-green-cyan) !important;}.has-vivid-green-cyan-border-color{border-color: var(--wp--preset--color--vivid-green-cyan) !important;}.has-pale-cyan-blue-border-color{border-color: var(--wp--preset--color--pale-cyan-blue) !important;}.has-vivid-cyan-blue-border-color{border-color: var(--wp--preset--color--vivid-cyan-blue) !important;}.has-vivid-purple-border-color{border-color: var(--wp--preset--color--vivid-purple) !important;}.has-vivid-cyan-blue-to-vivid-purple-gradient-background{background: var(--wp--preset--gradient--vivid-cyan-blue-to-vivid-purple) !important;}.has-light-green-cyan-to-vivid-green-cyan-gradient-background{background: var(--wp--preset--gradient--light-green-cyan-to-vivid-green-cyan) !important;}.has-luminous-vivid-amber-to-luminous-vivid-orange-gradient-background{background: var(--wp--preset--gradient--luminous-vivid-amber-to-luminous-vivid-orange) !important;}.has-luminous-vivid-orange-to-vivid-red-gradient-background{background: var(--wp--preset--gradient--luminous-vivid-orange-to-vivid-red) !important;}.has-very-light-gray-to-cyan-bluish-gray-gradient-background{background: var(--wp--preset--gradient--very-light-gray-to-cyan-bluish-gray) !important;}.has-cool-to-warm-spectrum-gradient-background{background: var(--wp--preset--gradient--cool-to-warm-spectrum) !important;}.has-blush-light-purple-gradient-background{background: var(--wp--preset--gradient--blush-light-purple) !important;}.has-blush-bordeaux-gradient-background{background: var(--wp--preset--gradient--blush-bordeaux) !important;}.has-luminous-dusk-gradient-background{background: var(--wp--preset--gradient--luminous-dusk) !important;}.has-pale-ocean-gradient-background{background: var(--wp--preset--gradient--pale-ocean) !important;}.has-electric-grass-gradient-background{background: var(--wp--preset--gradient--electric-grass) !important;}.has-midnight-gradient-background{background: var(--wp--preset--gradient--midnight) !important;}.has-small-font-size{font-size: var(--wp--preset--font-size--small) !important;}.has-medium-font-size{font-size: var(--wp--preset--font-size--medium) !important;}.has-large-font-size{font-size: var(--wp--preset--font-size--large) !important;}.has-x-large-font-size{font-size: var(--wp--preset--font-size--x-large) !important;}.has-albert-sans-font-family{font-family: var(--wp--preset--font-family--albert-sans) !important;}.has-alegreya-font-family{font-family: var(--wp--preset--font-family--alegreya) !important;}.has-arvo-font-family{font-family: var(--wp--preset--font-family--arvo) !important;}.has-bodoni-moda-font-family{font-family: var(--wp--preset--font-family--bodoni-moda) !important;}.has-bricolage-grotesque-font-family{font-family: var(--wp--preset--font-family--bricolage-grotesque) !important;}.has-cabin-font-family{font-family: var(--wp--preset--font-family--cabin) !important;}.has-chivo-font-family{font-family: var(--wp--preset--font-family--chivo) !important;}.has-commissioner-font-family{font-family: var(--wp--preset--font-family--commissioner) !important;}.has-cormorant-font-family{font-family: var(--wp--preset--font-family--cormorant) !important;}.has-courier-prime-font-family{font-family: var(--wp--preset--font-family--courier-prime) !important;}.has-crimson-pro-font-family{font-family: var(--wp--preset--font-family--crimson-pro) !important;}.has-dm-mono-font-family{font-family: var(--wp--preset--font-family--dm-mono) !important;}.has-dm-sans-font-family{font-family: var(--wp--preset--font-family--dm-sans) !important;}.has-dm-serif-display-font-family{font-family: var(--wp--preset--font-family--dm-serif-display) !important;}.has-domine-font-family{font-family: var(--wp--preset--font-family--domine) !important;}.has-eb-garamond-font-family{font-family: var(--wp--preset--font-family--eb-garamond) !important;}.has-epilogue-font-family{font-family: var(--wp--preset--font-family--epilogue) !important;}.has-fahkwang-font-family{font-family: var(--wp--preset--font-family--fahkwang) !important;}.has-figtree-font-family{font-family: var(--wp--preset--font-family--figtree) !important;}.has-fira-sans-font-family{font-family: var(--wp--preset--font-family--fira-sans) !important;}.has-fjalla-one-font-family{font-family: var(--wp--preset--font-family--fjalla-one) !important;}.has-fraunces-font-family{font-family: var(--wp--preset--font-family--fraunces) !important;}.has-gabarito-font-family{font-family: var(--wp--preset--font-family--gabarito) !important;}.has-ibm-plex-mono-font-family{font-family: var(--wp--preset--font-family--ibm-plex-mono) !important;}.has-ibm-plex-sans-font-family{font-family: var(--wp--preset--font-family--ibm-plex-sans) !important;}.has-ibarra-real-nova-font-family{font-family: var(--wp--preset--font-family--ibarra-real-nova) !important;}.has-instrument-serif-font-family{font-family: var(--wp--preset--font-family--instrument-serif) !important;}.has-inter-font-family{font-family: var(--wp--preset--font-family--inter) !important;}.has-josefin-sans-font-family{font-family: var(--wp--preset--font-family--josefin-sans) !important;}.has-jost-font-family{font-family: var(--wp--preset--font-family--jost) !important;}.has-libre-baskerville-font-family{font-family: var(--wp--preset--font-family--libre-baskerville) !important;}.has-libre-franklin-font-family{font-family: var(--wp--preset--font-family--libre-franklin) !important;}.has-literata-font-family{font-family: var(--wp--preset--font-family--literata) !important;}.has-lora-font-family{font-family: var(--wp--preset--font-family--lora) !important;}.has-merriweather-font-family{font-family: var(--wp--preset--font-family--merriweather) !important;}.has-montserrat-font-family{font-family: var(--wp--preset--font-family--montserrat) !important;}.has-newsreader-font-family{font-family: var(--wp--preset--font-family--newsreader) !important;}.has-noto-sans-mono-font-family{font-family: var(--wp--preset--font-family--noto-sans-mono) !important;}.has-nunito-font-family{font-family: var(--wp--preset--font-family--nunito) !important;}.has-open-sans-font-family{font-family: var(--wp--preset--font-family--open-sans) !important;}.has-overpass-font-family{font-family: var(--wp--preset--font-family--overpass) !important;}.has-pt-serif-font-family{font-family: var(--wp--preset--font-family--pt-serif) !important;}.has-petrona-font-family{font-family: var(--wp--preset--font-family--petrona) !important;}.has-piazzolla-font-family{font-family: var(--wp--preset--font-family--piazzolla) !important;}.has-playfair-display-font-family{font-family: var(--wp--preset--font-family--playfair-display) !important;}.has-plus-jakarta-sans-font-family{font-family: var(--wp--preset--font-family--plus-jakarta-sans) !important;}.has-poppins-font-family{font-family: var(--wp--preset--font-family--poppins) !important;}.has-raleway-font-family{font-family: var(--wp--preset--font-family--raleway) !important;}.has-roboto-font-family{font-family: var(--wp--preset--font-family--roboto) !important;}.has-roboto-slab-font-family{font-family: var(--wp--preset--font-family--roboto-slab) !important;}.has-rubik-font-family{font-family: var(--wp--preset--font-family--rubik) !important;}.has-rufina-font-family{font-family: var(--wp--preset--font-family--rufina) !important;}.has-sora-font-family{font-family: var(--wp--preset--font-family--sora) !important;}.has-source-sans-3-font-family{font-family: var(--wp--preset--font-family--source-sans-3) !important;}.has-source-serif-4-font-family{font-family: var(--wp--preset--font-family--source-serif-4) !important;}.has-space-mono-font-family{font-family: var(--wp--preset--font-family--space-mono) !important;}.has-syne-font-family{font-family: var(--wp--preset--font-family--syne) !important;}.has-texturina-font-family{font-family: var(--wp--preset--font-family--texturina) !important;}.has-urbanist-font-family{font-family: var(--wp--preset--font-family--urbanist) !important;}.has-work-sans-font-family{font-family: var(--wp--preset--font-family--work-sans) !important;} :where(.wp-block-columns.is-layout-flex){gap: 2em;}:where(.wp-block-columns.is-layout-grid){gap: 2em;} :root :where(.wp-block-pullquote){font-size: 1.5em;line-height: 1.6;} :where(.wp-block-post-template.is-layout-flex){gap: 1.25em;}:where(.wp-block-post-template.is-layout-grid){gap: 1.25em;} </style> <link rel='stylesheet' id='dashicons-css' href='https://platypus.asn.au/wp-includes/css/dashicons.min.css?ver=6.7.2' media='all' /> <link rel='stylesheet' id='gateway-fonts-css' href='https://fonts-api.wp.com/css?family=Quattrocento%3A400%2C700%7CFanwood+Text%3A400%2C400italic&subset=latin%2Clatin-ext' media='all' /> <style id='akismet-widget-style-inline-css'> .a-stats { --akismet-color-mid-green: #357b49; --akismet-color-white: #fff; --akismet-color-light-grey: #f6f7f7; max-width: 350px; width: auto; } .a-stats * { all: unset; box-sizing: border-box; } .a-stats strong { font-weight: 600; } .a-stats a.a-stats__link, .a-stats a.a-stats__link:visited, .a-stats a.a-stats__link:active { background: var(--akismet-color-mid-green); border: none; box-shadow: none; border-radius: 8px; color: var(--akismet-color-white); cursor: pointer; display: block; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen-Sans', 'Ubuntu', 'Cantarell', 'Helvetica Neue', sans-serif; font-weight: 500; padding: 12px; text-align: center; text-decoration: none; transition: all 0.2s ease; } /* Extra specificity to deal with TwentyTwentyOne focus style */ .widget .a-stats a.a-stats__link:focus { background: var(--akismet-color-mid-green); color: var(--akismet-color-white); text-decoration: none; } .a-stats a.a-stats__link:hover { filter: brightness(110%); box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06), 0 0 2px rgba(0, 0, 0, 0.16); } .a-stats .count { color: var(--akismet-color-white); display: block; font-size: 1.5em; line-height: 1.4; padding: 0 13px; white-space: nowrap; } </style> <style id='jetpack-global-styles-frontend-style-inline-css'> :root { --font-headings: unset; --font-base: unset; --font-headings-default: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen-Sans,Ubuntu,Cantarell,"Helvetica Neue",sans-serif; --font-base-default: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen-Sans,Ubuntu,Cantarell,"Helvetica Neue",sans-serif;} </style> <script type="text/javascript" id="jetpack-mu-wpcom-settings-js-before"> /* <![CDATA[ */ var JETPACK_MU_WPCOM_SETTINGS = {"assetsUrl":"https:\/\/platypus.asn.au\/wp-content\/mu-plugins\/wpcomsh\/jetpack_vendor\/automattic\/jetpack-mu-wpcom\/src\/build\/"}; /* ]]> */ </script> <script type="text/javascript" id="wpgmza_data-js-extra"> /* <![CDATA[ */ var wpgmza_google_api_status = {"message":"Engine is not google-maps","code":"ENGINE_NOT_GOOGLE_MAPS"}; /* ]]> */ </script> <script type='text/javascript' src='https://platypus.asn.au/wp-content/plugins/wp-google-maps/wpgmza_data.js?m=1732034880'></script> <script type="text/javascript" src="https://platypus.asn.au/wp-includes/js/jquery/jquery.min.js?ver=3.7.1" id="jquery-core-js"></script> <script type='text/javascript' src='https://platypus.asn.au/wp-includes/js/jquery/jquery-migrate.min.js?m=1686289764'></script> <link rel="https://api.w.org/" href="https://platypus.asn.au/wp-json/" /><link rel="alternate" title="JSON" type="application/json" href="https://platypus.asn.au/wp-json/wp/v2/pages/6162" /><link rel="EditURI" type="application/rsd+xml" title="RSD" href="https://platypus.asn.au/xmlrpc.php?rsd" /> <link rel='shortlink' href='https://wp.me/P88gm0-1Bo' /> <link rel="alternate" title="oEmbed (JSON)" type="application/json+oembed" href="https://platypus.asn.au/wp-json/oembed/1.0/embed?url=https%3A%2F%2Fplatypus.asn.au%2Fweir-walls-and-fishways%2F" /> <link rel="alternate" title="oEmbed (XML)" type="text/xml+oembed" href="https://platypus.asn.au/wp-json/oembed/1.0/embed?url=https%3A%2F%2Fplatypus.asn.au%2Fweir-walls-and-fishways%2F&format=xml" /> <style>img#wpstats{display:none}</style> <style type="text/css"> .site-title, .site-description { position: absolute; clip: rect(1px, 1px, 1px, 1px); } .header-bg { background-image: url( https://platypus.asn.au/wp-content/uploads/2016/11/cropped-feeding_platypus_commons1.jpg ); background-repeat: no-repeat; } @media screen and ( min-width: 50em ) { .header-bg { background-attachment: scroll; background-position: center; } } </style> <link rel="amphtml" href="https://platypus.asn.au/weir-walls-and-fishways/?amp"><link rel="icon" href="https://s0.wp.com/i/webclip.png" sizes="32x32" /> <link rel="icon" href="https://s0.wp.com/i/webclip.png" sizes="192x192" /> <link rel="apple-touch-icon" href="https://s0.wp.com/i/webclip.png" /> <meta name="msapplication-TileImage" content="https://s0.wp.com/i/webclip.png" /> <style type="text/css" id="wp-custom-css">p {color:#000000;}</style></head> <body class="page-template-default page page-id-6162 group-blog custom-colors author-hidden"> <div id="page" class="hfeed site"> <a class="skip-link screen-reader-text" href="#content">Skip to content</a> <div class="header-bg"> <div class="site-branding"> <h1 class="site-title"><a href="https://platypus.asn.au/" rel="home">Australian Platypus Conservancy</a></h1> <h2 class="site-description">Australian Platypus Conservancy</h2> </div> </div> <header id="masthead" class="site-header" role="banner"> <div class="stick"> <nav id="site-navigation" class="main-navigation clear" role="navigation"> <button class="menu-toggle" aria-controls="primary-menu" aria-expanded="false">Menu</button> <div class="menu-primary-container"><ul id="primary-menu" class="menu"><li id="menu-item-18" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-home menu-item-18"><a href="https://platypus.asn.au/">HOME</a></li> <li id="menu-item-2183" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children menu-item-2183"><a href="https://platypus.asn.au/platypus-survey-monitoring/">Platypus Survey & Monitoring</a> <ul class="sub-menu"> <li id="menu-item-2185" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-2185"><a href="https://platypus.asn.au/overview-of-methods-pros-and-cons/">Platypus survey methods (pros and cons)</a></li> <li id="menu-item-2187" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-2187"><a href="https://platypus.asn.au/live-trapping-methods/">Live-trapping methods</a></li> <li id="menu-item-2189" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-2189"><a href="https://platypus.asn.au/visual-methods/">Visual methods</a></li> <li id="menu-item-2317" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-2317"><a href="https://platypus.asn.au/other-methods-for-platypus-survey-or-monitoring/">Environmental DNA (eDNA)</a></li> <li id="menu-item-6616" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-6616"><a href="https://platypus.asn.au/cameras/">Cameras</a></li> <li id="menu-item-6615" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-6615"><a href="https://platypus.asn.au/burrow-counts/">Platypus burrow counts</a></li> <li id="menu-item-249" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-249"><a href="https://platypus.asn.au/spotting-hints/">Spotting hints</a></li> </ul> </li> <li id="menu-item-1990" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children menu-item-1990"><a href="https://platypus.asn.au/conservation-issues/">Platypus Conservation Issues</a> <ul class="sub-menu"> <li id="menu-item-12235" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-12235"><a href="https://platypus.asn.au/water-flow-and-the-platypus/">Water flow</a></li> <li id="menu-item-12236" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-12236"><a href="https://platypus.asn.au/water-quality-and-the-platypus/">Water quality</a></li> <li id="menu-item-12233" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-12233"><a href="https://platypus.asn.au/platypus-habitat-quality/">Habitat quality</a></li> <li id="menu-item-12239" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-12239"><a href="https://platypus.asn.au/dams-weirs-and-the-platypus/">Dams & weirs</a></li> <li id="menu-item-12237" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-12237"><a href="https://platypus.asn.au/urban-stream-syndrome-and-the-platypus/">Urban development</a></li> <li id="menu-item-12240" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-12240"><a href="https://platypus.asn.au/pumps-pipes-culverts-and-the-platypus/">Culverts & pipes</a></li> <li id="menu-item-12241" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-12241"><a href="https://platypus.asn.au/litter-and-the-platypus/">Litter</a></li> <li id="menu-item-12234" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-12234"><a href="https://platypus.asn.au/angling-and-the-platypus/">Angling</a></li> <li id="menu-item-12231" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-12231"><a href="https://platypus.asn.au/platypus-deaths-in-nets-and-traps/">Dangerous nets & traps</a></li> <li id="menu-item-12238" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-12238"><a href="https://platypus.asn.au/platypus-predators-and-disease/">Predators & disease</a></li> <li id="menu-item-12232" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-12232"><a href="https://platypus.asn.au/wildfire-and-the-platypus/">Wildfire</a></li> </ul> </li> <li id="menu-item-6285" class="menu-item menu-item-type-post_type menu-item-object-page current-menu-ancestor current-menu-parent current_page_parent current_page_ancestor menu-item-has-children menu-item-6285"><a href="https://platypus.asn.au/management-guidelines-2/">Platypus Management Guidelines</a> <ul class="sub-menu"> <li id="menu-item-6286" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-6286"><a href="https://platypus.asn.au/maintaining-a-suitable-flow-regime-in-managed-river-systems/">Streamflow</a></li> <li id="menu-item-6291" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-6291"><a href="https://platypus.asn.au/water-quality-and-sediment-contaminants/">Water quality</a></li> <li id="menu-item-6288" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-6288"><a href="https://platypus.asn.au/protecting-and-improving-bank-habitats/">Bank habitats</a></li> <li id="menu-item-6289" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-6289"><a href="https://platypus.asn.au/instream-woody-habitat-logs-and-branches/">Instream wood</a></li> <li id="menu-item-6290" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-6290"><a href="https://platypus.asn.au/managing-stormwater-drainage/">Stormwater drainage</a></li> <li id="menu-item-6287" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-6287"><a href="https://platypus.asn.au/platypus-drought-refuges/">Drought refuges</a></li> <li id="menu-item-6295" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-6295"><a href="https://platypus.asn.au/culverts-pipes-and-grilles/">Culverts & pipes</a></li> <li id="menu-item-6297" class="menu-item menu-item-type-post_type menu-item-object-page current-menu-item page_item page-item-6162 current_page_item menu-item-6297"><a href="https://platypus.asn.au/weir-walls-and-fishways/" aria-current="page">Weirs & fishways</a></li> <li id="menu-item-6296" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-6296"><a href="https://platypus.asn.au/walking-tracks-viewing-platforms-bridges-and-street-lighting/">Paths & lights</a></li> <li id="menu-item-6293" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-6293"><a href="https://platypus.asn.au/use-of-heavy-machinery-in-and-near-waterways/">Use of heavy equipment</a></li> <li id="menu-item-6298" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-6298"><a href="https://platypus.asn.au/pumps-and-small-scale-hydropower-generators/">Pumps & generators</a></li> </ul> </li> <li id="menu-item-11698" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children menu-item-11698"><a href="https://platypus.asn.au/platypus-biology/">Platypus Biology</a> <ul class="sub-menu"> <li id="menu-item-11651" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-11651"><a href="https://platypus.asn.au/platypus-vital-statistics/">Vital statistics</a></li> <li id="menu-item-11652" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-11652"><a href="https://platypus.asn.au/platypus-fur-colour-and-general-features/">General features and fur colour</a></li> <li id="menu-item-11653" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-11653"><a href="https://platypus.asn.au/the-platypus-bill-push-rods-and-electroreception/">The bill and its senses</a></li> <li id="menu-item-11654" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-11654"><a href="https://platypus.asn.au/platypus-vision-and-hearing/">Vision and hearing</a></li> <li id="menu-item-11655" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-11655"><a href="https://platypus.asn.au/platypus-body-temperature/">Body temperature</a></li> <li id="menu-item-11656" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-11656"><a href="https://platypus.asn.au/platypus-venom-and-spurs/">Venom and spurs</a></li> <li id="menu-item-11657" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-11657"><a href="https://platypus.asn.au/platypus-genetics-and-dispersal/">Genetics and dispersal</a></li> <li id="menu-item-11658" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-11658"><a href="https://platypus.asn.au/platypus-sleep-and-dreaming/">Sleep and dreaming</a></li> </ul> </li> <li id="menu-item-1999" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children menu-item-1999"><a href="https://platypus.asn.au/ecology-behaviour/">Platypus Ecology & Behaviour</a> <ul class="sub-menu"> <li id="menu-item-11666" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-11666"><a href="https://platypus.asn.au/platypus-foraging-behaviour/">Foraging behaviour</a></li> <li id="menu-item-11667" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-11667"><a href="https://platypus.asn.au/platypus-diet-and-food-consumption/">Diet and food consumption</a></li> <li id="menu-item-11668" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-11668"><a href="https://platypus.asn.au/platypus-home-range-movements-and-dispersal/">Home range and movements</a></li> <li id="menu-item-11669" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-11669"><a href="https://platypus.asn.au/platypus-burrows/">Burrows</a></li> <li id="menu-item-11670" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-11670"><a href="https://platypus.asn.au/platypus-reproduction/">Reproduction</a></li> <li id="menu-item-11671" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-11671"><a href="https://platypus.asn.au/platypus-courtship-mating-and-nest-building/">Courtship, mating and nest-building</a></li> <li id="menu-item-11672" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-11672"><a href="https://platypus.asn.au/platypus-communication/">Communication</a></li> <li id="menu-item-11673" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-11673"><a href="https://platypus.asn.au/platypus-mortality-factors/">Mortality factors</a></li> </ul> </li> <li id="menu-item-2003" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children menu-item-2003"><a href="https://platypus.asn.au/evolution-names/">Names & Evolution</a> <ul class="sub-menu"> <li id="menu-item-11638" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-11638"><a href="https://platypus.asn.au/platypus-names-including-whats-the-plural-of-platypus/">Names (including “What’s the plural of platypus?”)</a></li> <li id="menu-item-11640" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-11640"><a href="https://platypus.asn.au/the-platypuss-fossil-history/">Fossil history</a></li> <li id="menu-item-11641" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-11641"><a href="https://platypus.asn.au/echidnas-the-other-modern-monotremes/">Echidnas – the other modern monotremes</a></li> </ul> </li> <li id="menu-item-2001" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children menu-item-2001"><a href="https://platypus.asn.au/distribution-numbers/">Platypus Status</a> <ul class="sub-menu"> <li id="menu-item-12577" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-12577"><a href="https://platypus.asn.au/conservation-status/">Platypus conservation status</a></li> <li id="menu-item-12578" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-12578"><a href="https://platypus.asn.au/distribution/">Platypus distribution</a></li> <li id="menu-item-12576" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-12576"><a href="https://platypus.asn.au/population-size-and-density/">Platypus abundance</a></li> </ul> </li> <li id="menu-item-1998" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children menu-item-1998"><a href="https://platypus.asn.au/faqs/">FAQs & Myths</a> <ul class="sub-menu"> <li id="menu-item-12574" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-12574"><a href="https://platypus.asn.au/some-platypus-faqs/">Some platypus FAQs</a></li> <li id="menu-item-12575" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-12575"><a href="https://platypus.asn.au/platypus-myths/">Some platypus myths</a></li> </ul> </li> <li id="menu-item-11819" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children menu-item-11819"><a href="https://platypus.asn.au/rakali-master/">Rakali</a> <ul class="sub-menu"> <li id="menu-item-11774" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-11774"><a href="https://platypus.asn.au/rakali-size-and-general-features/">Size and general features</a></li> <li id="menu-item-11793" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-11793"><a href="https://platypus.asn.au/rakali-distribution-and-habitats/">Distribution and habitats</a></li> <li id="menu-item-11770" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-11770"><a href="https://platypus.asn.au/rakali-names-and-origin/">Names and origin</a></li> <li id="menu-item-11785" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-11785"><a href="https://platypus.asn.au/rakali-spatial-use-and-shelter-sites/">Spatial use and shelter sites</a></li> <li id="menu-item-11779" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-11779"><a href="https://platypus.asn.au/rakali-diet-and-foraging-behaviour/">Diet and foraging behaviour</a></li> <li id="menu-item-11782" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-11782"><a href="https://platypus.asn.au/rakali-reproduction/">Reproduction</a></li> <li id="menu-item-11789" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-11789"><a href="https://platypus.asn.au/rakali-conservation-status-and-concerns/">Rakali conservation status</a></li> <li id="menu-item-11791" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-11791"><a href="https://platypus.asn.au/coexistence-of-rakali-and-platypus/">Coexistence of rakali and platypus</a></li> </ul> </li> <li id="menu-item-19" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-privacy-policy menu-item-19"><a rel="privacy-policy" href="https://platypus.asn.au/about/">About the Conservancy</a></li> <li id="menu-item-21" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-21"><a href="https://platypus.asn.au/apc-newsletter/">APC Newsletter</a></li> <li id="menu-item-10930" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-10930"><a href="https://platypus.asn.au/report-a-sighting/">Report a Sighting</a></li> <li id="menu-item-13134" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children menu-item-13134"><a href="https://platypus.asn.au/how-you-can-help/">Donate or Make Bequest</a> <ul class="sub-menu"> <li id="menu-item-11145" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-11145"><a href="https://platypus.asn.au/donate-by-bank-transfer/">Donate by bank transfer</a></li> <li id="menu-item-11141" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-11141"><a href="https://platypus.asn.au/donate-by-visa-mastercard/">Donate by Visa/Mastercard</a></li> <li id="menu-item-14252" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-14252"><a href="https://platypus.asn.au/make-a-bequest/">Make a Bequest</a></li> </ul> </li> </ul></div> </nav> </div> </header> <div id="content" class="site-content"> <div id="primary" class="content-area"> <main id="main" class="site-main" role="main"> <article id="post-6162" class="post-6162 page type-page status-publish hentry"> <header class="entry-header"> <h2 class="entry-title">Improving platypus passage: weirs and fishways</h2> </header> <div class="entry-content"> <div class="featured-image"> </div> <p class="has-black-color has-text-color">It is known from live-trapping studies that a platypus can travel both upstream and downstream past sizable waterfalls as exemplified by Mackenzie Falls in Grampians National Park, which is more than 30 metres high (shown below at left) (Griffiths and Weeks 2010). This indicates that natural waterfalls are unlikely to prevent a platypus from bypassing them if the animal can exit the water and climb up or down at least one adjoining slope. It should therefore not be particularly surprising that 45% of adult males and 23% of adult/subadult females captured within 3 kilometres of the Belgrave Lake weir wall in Melbourne’s outer eastern suburbs – a steep concrete structure measuring just under 6 metres high (shown below at right) – were confirmed to have travelled past the structure on at least one occasion, again presumably by climbing up or down the adjoining vegetated slopes (Serena et al. 2023). Similarly, animals have been repeatedly recorded leaving the water and moving across land to bypass the 10-metre-high Blue Lake Dam wall in Jenolan Karst Conservation Reserve (Musser et al. 2024).</p> <figure data-carousel-extra='{"blog_id":1,"permalink":"https:\/\/platypus.asn.au\/weir-walls-and-fishways\/"}' class="wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex"> <figure class="wp-block-image size-large"><img data-recalc-dims="1" fetchpriority="high" decoding="async" width="748" height="561" data-attachment-id="12354" data-permalink="https://platypus.asn.au/weir-walls-and-fishways/mackenzie-falls-052/" data-orig-file="https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/Mackenzie-Falls-052.jpg?fit=4896%2C3672&ssl=1" data-orig-size="4896,3672" data-comments-opened="1" data-image-meta="{"aperture":"4","credit":"","camera":"DSC-HX90V","caption":"","created_timestamp":"1640178986","copyright":"","focal_length":"5.26","iso":"80","shutter_speed":"0.0025","title":"","orientation":"1"}" data-image-title="Mackenzie-Falls-052" data-image-description="" data-image-caption="" data-medium-file="https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/Mackenzie-Falls-052.jpg?fit=300%2C225&ssl=1" data-large-file="https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/Mackenzie-Falls-052.jpg?fit=748%2C561&ssl=1" data-id="12354" class="wp-image-12354" src="https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/Mackenzie-Falls-052.jpg?resize=748%2C561&ssl=1" alt="Despite being more than 30 metres high, MacKenzie Falls is not an intractable barrier to platypus movement." srcset="https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/Mackenzie-Falls-052.jpg?resize=1024%2C768&ssl=1 1024w, https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/Mackenzie-Falls-052.jpg?resize=300%2C225&ssl=1 300w, https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/Mackenzie-Falls-052.jpg?resize=768%2C576&ssl=1 768w, https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/Mackenzie-Falls-052.jpg?resize=1536%2C1152&ssl=1 1536w, https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/Mackenzie-Falls-052.jpg?resize=2048%2C1536&ssl=1 2048w, https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/Mackenzie-Falls-052.jpg?resize=1200%2C900&ssl=1 1200w, https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/Mackenzie-Falls-052.jpg?resize=800%2C600&ssl=1 800w, https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/Mackenzie-Falls-052.jpg?resize=600%2C450&ssl=1 600w, https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/Mackenzie-Falls-052.jpg?resize=400%2C300&ssl=1 400w, https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/Mackenzie-Falls-052.jpg?resize=200%2C150&ssl=1 200w, https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/Mackenzie-Falls-052.jpg?w=2244&ssl=1 2244w" sizes="(max-width: 748px) 100vw, 748px" /></figure> <figure class="wp-block-image size-large"><img data-recalc-dims="1" decoding="async" width="327" height="328" data-attachment-id="12352" data-permalink="https://platypus.asn.au/weir-walls-and-fishways/screenshot-belgrave-lke/" data-orig-file="https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/screenshot-Belgrave-Lke.png?fit=327%2C328&ssl=1" data-orig-size="327,328" data-comments-opened="1" data-image-meta="{"aperture":"0","credit":"","camera":"","caption":"","created_timestamp":"0","copyright":"","focal_length":"0","iso":"0","shutter_speed":"0","title":"","orientation":"0"}" data-image-title="screenshot-Belgrave-Lke" data-image-description="" data-image-caption="" data-medium-file="https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/screenshot-Belgrave-Lke.png?fit=300%2C300&ssl=1" data-large-file="https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/screenshot-Belgrave-Lke.png?fit=327%2C328&ssl=1" data-id="12352" class="wp-image-12352" src="https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/screenshot-Belgrave-Lke.png?resize=327%2C328&ssl=1" alt="Platypus routinely travel around this 6-metre-high concrete weir wall in Melbourne's eastern suburbs. " srcset="https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/screenshot-Belgrave-Lke.png?w=327&ssl=1 327w, https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/screenshot-Belgrave-Lke.png?resize=300%2C300&ssl=1 300w, https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/screenshot-Belgrave-Lke.png?resize=150%2C150&ssl=1 150w, https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/screenshot-Belgrave-Lke.png?resize=200%2C200&ssl=1 200w" sizes="(max-width: 327px) 100vw, 327px" /></figure> </figure> <p class="has-black-color has-text-color">Although platypus are quite good at scrambling up steep banks, they find it difficult or impossible to climb vertical or near-vertical concrete or metal surfaces, particularly if large volumes of water are cascading down. Weir walls and associated structures can therefore be intractable barriers to a platypus seeking to move upstream and/or downstream, particularly if the animal finds it difficult or impossible to leave the channel due to other adjoining vertical walls being present (as illustrated in the two photos below).</p> <figure data-carousel-extra='{"blog_id":1,"permalink":"https:\/\/platypus.asn.au\/weir-walls-and-fishways\/"}' class="wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-2 is-layout-flex wp-block-gallery-is-layout-flex"> <figure class="wp-block-image size-large"><img data-recalc-dims="1" decoding="async" width="748" height="499" data-attachment-id="6171" data-permalink="https://platypus.asn.au/weir-walls-and-fishways/attachment/005/" data-orig-file="https://i0.wp.com/platypus.asn.au/wp-content/uploads/2021/06/005.jpg?fit=4608%2C3072&ssl=1" data-orig-size="4608,3072" data-comments-opened="1" data-image-meta="{"aperture":"5","credit":"","camera":"NIKON D3100","caption":"","created_timestamp":"1399292934","copyright":"","focal_length":"32","iso":"400","shutter_speed":"0.01","title":"","orientation":"1"}" data-image-title="005" data-image-description="" data-image-caption="" data-medium-file="https://i0.wp.com/platypus.asn.au/wp-content/uploads/2021/06/005.jpg?fit=300%2C200&ssl=1" data-large-file="https://i0.wp.com/platypus.asn.au/wp-content/uploads/2021/06/005.jpg?fit=748%2C499&ssl=1" data-id="6171" class="wp-image-6171" src="https://i0.wp.com/platypus.asn.au/wp-content/uploads/2021/06/005.jpg?resize=748%2C499&ssl=1" alt="The vertical walls adjoining this concrete weir will make it very difficult for a platypus to bypass the weir, particularly when travelling upstream. " srcset="https://i0.wp.com/platypus.asn.au/wp-content/uploads/2021/06/005.jpg?resize=1024%2C683&ssl=1 1024w, https://i0.wp.com/platypus.asn.au/wp-content/uploads/2021/06/005.jpg?resize=300%2C200&ssl=1 300w, https://i0.wp.com/platypus.asn.au/wp-content/uploads/2021/06/005.jpg?resize=768%2C512&ssl=1 768w, https://i0.wp.com/platypus.asn.au/wp-content/uploads/2021/06/005.jpg?resize=1536%2C1024&ssl=1 1536w, https://i0.wp.com/platypus.asn.au/wp-content/uploads/2021/06/005.jpg?resize=2048%2C1365&ssl=1 2048w, https://i0.wp.com/platypus.asn.au/wp-content/uploads/2021/06/005.jpg?resize=1200%2C800&ssl=1 1200w, https://i0.wp.com/platypus.asn.au/wp-content/uploads/2021/06/005.jpg?w=2244&ssl=1 2244w" sizes="(max-width: 748px) 100vw, 748px" /></figure> <figure class="wp-block-image size-large"><img data-recalc-dims="1" loading="lazy" decoding="async" width="748" height="561" data-attachment-id="12359" data-permalink="https://platypus.asn.au/weir-walls-and-fishways/attachment/031/" data-orig-file="https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/031.jpg?fit=4896%2C3672&ssl=1" data-orig-size="4896,3672" data-comments-opened="1" data-image-meta="{"aperture":"4.5","credit":"","camera":"DSC-HX90V","caption":"","created_timestamp":"1663581503","copyright":"","focal_length":"11.32","iso":"80","shutter_speed":"0.005","title":"","orientation":"1"}" data-image-title="031" data-image-description="" data-image-caption="" data-medium-file="https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/031.jpg?fit=300%2C225&ssl=1" data-large-file="https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/031.jpg?fit=748%2C561&ssl=1" data-id="12359" class="wp-image-12359" src="https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/031.jpg?resize=748%2C561&ssl=1" alt="The design of the upstream end of the Lake Eppalock spillway will make it very difficult for a platypus to move farther downstream unless water is actually spilling over the top." srcset="https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/031.jpg?resize=1024%2C768&ssl=1 1024w, https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/031.jpg?resize=300%2C225&ssl=1 300w, https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/031.jpg?resize=768%2C576&ssl=1 768w, https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/031.jpg?resize=1536%2C1152&ssl=1 1536w, https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/031.jpg?resize=2048%2C1536&ssl=1 2048w, https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/031.jpg?resize=1200%2C900&ssl=1 1200w, https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/031.jpg?resize=800%2C600&ssl=1 800w, https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/031.jpg?resize=600%2C450&ssl=1 600w, https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/031.jpg?resize=400%2C300&ssl=1 400w, https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/031.jpg?resize=200%2C150&ssl=1 200w, https://i0.wp.com/platypus.asn.au/wp-content/uploads/2024/04/031.jpg?w=2244&ssl=1 2244w" sizes="auto, (max-width: 748px) 100vw, 748px" /></figure> </figure> <p> </p> <div class="wp-block-image is-resized"> <figure class="alignright size-large"><img data-recalc-dims="1" loading="lazy" decoding="async" width="423" height="269" data-attachment-id="6181" data-permalink="https://platypus.asn.au/weir-walls-and-fishways/weir-fishladder-gunbck/" data-orig-file="https://i0.wp.com/platypus.asn.au/wp-content/uploads/2021/06/weir-fishladder-GunbCk.jpg?fit=423%2C269&ssl=1" data-orig-size="423,269" data-comments-opened="1" data-image-meta="{"aperture":"2.8","credit":"","camera":"Canon PowerShot S45","caption":"","created_timestamp":"1282235364","copyright":"","focal_length":"7.09375","iso":"0","shutter_speed":"0.001","title":"","orientation":"1"}" data-image-title="weir-fishladder-GunbCk" data-image-description="" data-image-caption="" data-medium-file="https://i0.wp.com/platypus.asn.au/wp-content/uploads/2021/06/weir-fishladder-GunbCk.jpg?fit=300%2C191&ssl=1" data-large-file="https://i0.wp.com/platypus.asn.au/wp-content/uploads/2021/06/weir-fishladder-GunbCk.jpg?fit=423%2C269&ssl=1" class="wp-image-6181" style="width: 408px; height: auto;" src="https://i0.wp.com/platypus.asn.au/wp-content/uploads/2021/06/weir-fishladder-GunbCk.jpg?resize=423%2C269&ssl=1" alt="A fishway that should be readily used by a platypus." srcset="https://i0.wp.com/platypus.asn.au/wp-content/uploads/2021/06/weir-fishladder-GunbCk.jpg?w=423&ssl=1 423w, https://i0.wp.com/platypus.asn.au/wp-content/uploads/2021/06/weir-fishladder-GunbCk.jpg?resize=300%2C191&ssl=1 300w" sizes="auto, (max-width: 423px) 100vw, 423px" /></figure></div> <p class="has-black-color has-text-color">Most structures designed to enable medium-to-large fish to travel past weir walls (including rock-ramp, Denil, natural bypass, cone, trapezoidal and vertical-slot fishways) should also be able to be navigated by a platypus. In particular, this species should easily cope with a water velocity of 0.3 metre/second (the recommended maximum to enable fish measuring more than 200 mm in length to navigate through fishways: O’Connor et al. 2017).</p> <p class="has-black-color has-text-color">Providing an attracting flow at a fishway entrance should help direct a platypus to use the structure, particularly when the structure is encountered for the first time. To accommodate a large platypus comfortably and reduce the risk that hard or sharp edges cause injuries, we recommend that the minimum aperture width in vertical-slot fishways (or in trash racks associated with fishways) should be 150 mm. A minimum water depth of 200-300 mm should ideally be maintained along the length of a fishway at all times (particularly if the structure is unscreened from above) so a platypus using the fishway remains fairly well hidden from the view of predators, including birds of prey.</p> <p class="has-black-color has-text-color">The only types of fishway that may not be well suited to platypus use are mechanical fish locks and lifts. Based on our knowledge of platypus behaviour, a platypus is likely to investigate the interior of a lock/lift box only briefly (probably for less than a minute) before it leaves. This presumably will mitigate against the animal being inside the box when the door shuts and the lift or lock mechanism starts to operate. Having said that, behavioural studies have never been carried out to describe how platypus interact with mechanical fishways – more information is needed. </p> <p class="has-black-color has-text-color">If a weir cannot for practical reasons be retrofitted with a fishway or modified structurally to facilitate platypus movement along a spillway, consider whether it might at least be possible to provide animals with substantial protective cover (for example, in the form of dense shrubby vegetation) along the most plausible route that will be used to move past the barrier across land (Serena et al. 2023). </p> <p class="has-black-color has-text-color"><em>Photos: APC</em></p> <p class="has-black-color has-text-color"><strong>LITERATURE CITED</strong></p> <p><em>Griffiths J and Weeks A (2010) Distribution and status of platypuses in the MacKenzie River, autumn 2010. Report to Wimmera CMA by Cesar Consultants, Parkville VIC.</em></p> <p><em>Musser A, Grant T and Turak E (2024) Movement of platypuses around and through instream structures and natural barriers in the Jenolan Karst Conservation Reserve, New South Wales. Australian Mammalogy 46, in press, doi: 10.1071/AM23031. </em></p> <p class="has-black-color has-text-color"><em>O’Connor J, Stuart I and Jones M (2017) Guidelines for the design, approval and construction of fishways. Arthur Rylah Institute for Environmental Research Technical Reports Series No. 274. </em></p> <p><em>Serena M, Crowther K and Kitchingman AM (2023) Managing the impacts of large weirs as barriers to platypus dispersal: current knowledge and recommended actions. Arthur Rylah Institute of Environmental Research Technical Report Series No. 361. Department of Energy, Environment and Climate Action, Heidelberg VIC. </em></p> <div class="sharedaddy sd-sharing-enabled"><div class="robots-nocontent sd-block sd-social sd-social-icon-text sd-sharing"><h3 class="sd-title">Share this:</h3><div class="sd-content"><ul><li class="share-facebook"><a rel="nofollow noopener noreferrer" data-shared="sharing-facebook-6162" class="share-facebook sd-button share-icon" href="https://platypus.asn.au/weir-walls-and-fishways/?share=facebook" target="_blank" title="Click to share on Facebook" ><span>Facebook</span></a></li><li class="share-email"><a rel="nofollow noopener noreferrer" data-shared="" class="share-email sd-button share-icon" href="mailto:?subject=%5BShared%20Post%5D%20Improving%20platypus%20passage%3A%20weirs%20and%20fishways&body=https%3A%2F%2Fplatypus.asn.au%2Fweir-walls-and-fishways%2F&share=email" target="_blank" title="Click to email a link to a friend" data-email-share-error-title="Do you have email set up?" data-email-share-error-text="If you're having problems sharing via email, you might not have email set up for your browser. You may need to create a new email yourself." data-email-share-nonce="0d2e6bff46" data-email-share-track-url="https://platypus.asn.au/weir-walls-and-fishways/?share=email"><span>Email</span></a></li><li class="share-twitter"><a rel="nofollow noopener noreferrer" data-shared="sharing-twitter-6162" class="share-twitter sd-button share-icon" href="https://platypus.asn.au/weir-walls-and-fishways/?share=twitter" target="_blank" title="Click to share on Twitter" ><span>Twitter</span></a></li><li class="share-end"></li></ul></div></div></div><div class='sharedaddy sd-block sd-like jetpack-likes-widget-wrapper jetpack-likes-widget-unloaded' id='like-post-wrapper-120180180-6162-67bf46bea6241' data-src='https://widgets.wp.com/likes/?ver=14.4-a.7#blog_id=120180180&post_id=6162&origin=platypus.asn.au&obj_id=120180180-6162-67bf46bea6241' data-name='like-post-frame-120180180-6162-67bf46bea6241' data-title='Like or Reblog'><h3 class="sd-title">Like this:</h3><div class='likes-widget-placeholder post-likes-widget-placeholder' style='height: 55px;'><span class='button'><span>Like</span></span> <span class="loading">Loading...</span></div><span class='sd-text-color'></span><a class='sd-link-color'></a></div> </div> <footer class="entry-footer"> </footer> </article> </main> </div> <div id="secondary" class="widget-area" role="complementary"> <aside id="search-1" class="widget widget_search"><form role="search" method="get" class="search-form" action="https://platypus.asn.au/"> <label> <span class="screen-reader-text">Search for:</span> <input type="search" class="search-field" placeholder="Search …" value="" name="s" /> </label> <input type="submit" class="search-submit" value="Search" /> </form></aside><aside id="wpcom_social_media_icons_widget-1" class="widget widget_wpcom_social_media_icons_widget"><h1 class="widget-title">Social</h1><ul><li><a href="https://www.facebook.com/Australian-Platypus-Conservancy-Official-225816770830721/" class="genericon genericon-facebook" target="_blank"><span class="screen-reader-text">View Australian-Platypus-Conservancy-Official-225816770830721’s profile on Facebook</span></a></li></ul></aside><aside id="archives-3" class="widget widget_archive"><h1 class="widget-title">Archives</h1> <label class="screen-reader-text" for="archives-dropdown-3">Archives</label> <select id="archives-dropdown-3" name="archive-dropdown"> <option value="">Select Month</option> <option value='https://platypus.asn.au/2024/12/'> December 2024 </option> <option value='https://platypus.asn.au/2024/09/'> September 2024 </option> <option value='https://platypus.asn.au/2024/03/'> March 2024 </option> <option value='https://platypus.asn.au/2023/12/'> December 2023 </option> <option value='https://platypus.asn.au/2023/09/'> September 2023 </option> <option value='https://platypus.asn.au/2023/03/'> March 2023 </option> <option value='https://platypus.asn.au/2022/12/'> December 2022 </option> <option value='https://platypus.asn.au/2022/10/'> October 2022 </option> <option value='https://platypus.asn.au/2022/09/'> September 2022 </option> <option value='https://platypus.asn.au/2022/06/'> June 2022 </option> <option value='https://platypus.asn.au/2022/03/'> March 2022 </option> <option value='https://platypus.asn.au/2021/12/'> December 2021 </option> <option value='https://platypus.asn.au/2021/09/'> September 2021 </option> <option value='https://platypus.asn.au/2021/06/'> June 2021 </option> <option value='https://platypus.asn.au/2021/03/'> March 2021 </option> <option value='https://platypus.asn.au/2020/11/'> November 2020 </option> <option value='https://platypus.asn.au/2020/09/'> September 2020 </option> <option value='https://platypus.asn.au/2020/06/'> June 2020 </option> <option value='https://platypus.asn.au/2020/02/'> February 2020 </option> <option value='https://platypus.asn.au/2019/12/'> December 2019 </option> <option value='https://platypus.asn.au/2019/11/'> November 2019 </option> <option value='https://platypus.asn.au/2019/07/'> July 2019 </option> <option value='https://platypus.asn.au/2019/06/'> June 2019 </option> <option value='https://platypus.asn.au/2019/03/'> March 2019 </option> <option value='https://platypus.asn.au/2018/12/'> December 2018 </option> <option value='https://platypus.asn.au/2018/09/'> September 2018 </option> <option value='https://platypus.asn.au/2018/06/'> June 2018 </option> <option value='https://platypus.asn.au/2018/03/'> March 2018 </option> <option value='https://platypus.asn.au/2017/12/'> December 2017 </option> <option value='https://platypus.asn.au/2017/11/'> November 2017 </option> <option value='https://platypus.asn.au/2017/07/'> July 2017 </option> <option value='https://platypus.asn.au/2017/04/'> April 2017 </option> <option value='https://platypus.asn.au/2016/11/'> November 2016 </option> <option value='https://platypus.asn.au/2016/08/'> August 2016 </option> <option value='https://platypus.asn.au/2016/05/'> May 2016 </option> <option value='https://platypus.asn.au/2016/02/'> February 2016 </option> <option value='https://platypus.asn.au/2015/11/'> November 2015 </option> <option value='https://platypus.asn.au/2015/08/'> August 2015 </option> <option value='https://platypus.asn.au/2015/05/'> May 2015 </option> <option value='https://platypus.asn.au/2015/02/'> February 2015 </option> <option value='https://platypus.asn.au/2014/11/'> November 2014 </option> <option value='https://platypus.asn.au/2014/08/'> August 2014 </option> <option value='https://platypus.asn.au/2014/05/'> May 2014 </option> <option value='https://platypus.asn.au/2014/02/'> February 2014 </option> <option value='https://platypus.asn.au/2013/11/'> November 2013 </option> <option value='https://platypus.asn.au/2013/08/'> August 2013 </option> <option value='https://platypus.asn.au/2013/06/'> June 2013 </option> <option value='https://platypus.asn.au/2013/02/'> February 2013 </option> <option value='https://platypus.asn.au/2012/10/'> October 2012 </option> <option value='https://platypus.asn.au/2012/06/'> June 2012 </option> <option value='https://platypus.asn.au/2012/02/'> February 2012 </option> <option value='https://platypus.asn.au/2011/10/'> October 2011 </option> <option value='https://platypus.asn.au/2011/06/'> June 2011 </option> <option value='https://platypus.asn.au/2011/03/'> March 2011 </option> <option value='https://platypus.asn.au/2010/10/'> October 2010 </option> <option value='https://platypus.asn.au/2010/06/'> June 2010 </option> <option value='https://platypus.asn.au/2010/03/'> March 2010 </option> <option value='https://platypus.asn.au/2009/10/'> October 2009 </option> <option value='https://platypus.asn.au/2009/05/'> May 2009 </option> <option value='https://platypus.asn.au/2009/02/'> February 2009 </option> <option value='https://platypus.asn.au/2008/09/'> September 2008 </option> <option value='https://platypus.asn.au/2008/03/'> March 2008 </option> <option value='https://platypus.asn.au/2007/10/'> October 2007 </option> <option value='https://platypus.asn.au/2007/05/'> May 2007 </option> <option value='https://platypus.asn.au/2007/01/'> January 2007 </option> <option value='https://platypus.asn.au/2006/08/'> August 2006 </option> <option value='https://platypus.asn.au/2006/02/'> February 2006 </option> <option value='https://platypus.asn.au/2005/10/'> October 2005 </option> <option value='https://platypus.asn.au/2005/06/'> June 2005 </option> <option value='https://platypus.asn.au/2005/02/'> February 2005 </option> <option value='https://platypus.asn.au/2004/10/'> October 2004 </option> <option value='https://platypus.asn.au/2004/05/'> May 2004 </option> <option value='https://platypus.asn.au/2004/02/'> February 2004 </option> <option value='https://platypus.asn.au/2003/09/'> September 2003 </option> <option value='https://platypus.asn.au/2003/03/'> March 2003 </option> <option value='https://platypus.asn.au/2002/10/'> October 2002 </option> <option value='https://platypus.asn.au/2002/07/'> July 2002 </option> <option value='https://platypus.asn.au/2001/11/'> November 2001 </option> <option value='https://platypus.asn.au/2001/09/'> September 2001 </option> <option value='https://platypus.asn.au/2001/06/'> June 2001 </option> <option value='https://platypus.asn.au/2000/12/'> December 2000 </option> <option value='https://platypus.asn.au/2000/07/'> July 2000 </option> <option value='https://platypus.asn.au/2000/04/'> April 2000 </option> <option value='https://platypus.asn.au/1999/12/'> December 1999 </option> </select> <script type="text/javascript"> /* <![CDATA[ */ (function() { var dropdown = document.getElementById( "archives-dropdown-3" ); function onSelectChange() { if ( dropdown.options[ dropdown.selectedIndex ].value !== '' ) { document.location.href = this.options[ this.selectedIndex ].value; } } dropdown.onchange = onSelectChange; })(); /* ]]> */ </script> </aside> </div> </div> <div class="footer-wrap clear"> <footer id="colophon" class="site-footer" role="contentinfo"> <div class="footer-widgets"> <div class="widget-area"> <aside id="text-2" class="widget widget_text"><h1 class="widget-title">Report a Platypus Sighting</h1> <div class="textwidget">If you have ever seen a platypus in the wild (either alive or dead), you possess information that is vital to our understanding of the status, distribution and conservation needs of the species. Therefore, please consider reporting the details of your sighting(s) to the Australian Platypus Conservancy. Use our <a href="https://platypus.asn.au/report-a-sighting/">Reporting Form</a> </div> </aside> </div> <div class="widget-area"> <aside id="text-3" class="widget widget_text"><h1 class="widget-title">Platypus & Water Rat Reports</h1> <div class="textwidget">If you wish to keep up to date with the Platypus and Water Rat Reports, please go to our <a href="https://www.facebook.com/Australian-Platypus-Conservancy-Official-225816770830721/">Facebook Page </a></div> </aside> </div> <div class="widget-area"> <aside id="text-4" class="widget widget_text"><h1 class="widget-title">Rakali – the water rat</h1> <div class="textwidget">Information about the Rakali or Australian water-rat is available via the <a href="/rakali">Rakali Page</a>. These are often mistaken for platypus, or found in similar locations.</div> </aside> </div> </div> <div class="site-info"> <a href="https://wordpress.com/?ref=footer_custom_powered">Powered by WordPress.com</a>. </div> </footer> </div> </div>  <script defer id="bilmur" data-customproperties="{"woo_active":"0"}" data-provider="wordpress.com" data-service="atomic" src="https://s0.wp.com/wp-content/js/bilmur.min.js?m=202509" data-site-tz="Etc/GMT-10"></script> <div id="jp-carousel-loading-overlay"> <div id="jp-carousel-loading-wrapper"> <span id="jp-carousel-library-loading"> </span> </div> </div> <div class="jp-carousel-overlay" style="display: none;"> <div class="jp-carousel-container">  <div class="jp-carousel-wrap swiper-container jp-carousel-swiper-container jp-carousel-transitions" itemscope itemtype="https://schema.org/ImageGallery"> <div class="jp-carousel swiper-wrapper"></div> <div class="jp-swiper-button-prev swiper-button-prev"> <svg width="25" height="24" viewBox="0 0 25 24" fill="none" xmlns="http://www.w3.org/2000/svg"> <mask id="maskPrev" mask-type="alpha" maskUnits="userSpaceOnUse" x="8" y="6" width="9" height="12"> <path d="M16.2072 16.59L11.6496 12L16.2072 7.41L14.8041 6L8.8335 12L14.8041 18L16.2072 16.59Z" fill="white"/> </mask> <g mask="url(#maskPrev)"> <rect x="0.579102" width="23.8823" height="24" fill="#FFFFFF"/> </g> </svg> </div> <div class="jp-swiper-button-next swiper-button-next"> <svg width="25" height="24" viewBox="0 0 25 24" fill="none" xmlns="http://www.w3.org/2000/svg"> <mask id="maskNext" mask-type="alpha" maskUnits="userSpaceOnUse" x="8" y="6" width="8" height="12"> <path d="M8.59814 16.59L13.1557 12L8.59814 7.41L10.0012 6L15.9718 12L10.0012 18L8.59814 16.59Z" fill="white"/> </mask> <g mask="url(#maskNext)"> <rect x="0.34375" width="23.8822" height="24" fill="#FFFFFF"/> </g> </svg> </div> </div>  <div class="jp-carousel-close-hint"> <svg width="25" height="24" viewBox="0 0 25 24" fill="none" xmlns="http://www.w3.org/2000/svg"> <mask id="maskClose" mask-type="alpha" maskUnits="userSpaceOnUse" x="5" y="5" width="15" height="14"> <path d="M19.3166 6.41L17.9135 5L12.3509 10.59L6.78834 5L5.38525 6.41L10.9478 12L5.38525 17.59L6.78834 19L12.3509 13.41L17.9135 19L19.3166 17.59L13.754 12L19.3166 6.41Z" fill="white"/> </mask> <g mask="url(#maskClose)"> <rect x="0.409668" width="23.8823" height="24" fill="#FFFFFF"/> </g> </svg> </div>  <div class="jp-carousel-info"> <div class="jp-carousel-info-footer"> <div class="jp-carousel-pagination-container"> <div class="jp-swiper-pagination swiper-pagination"></div> <div class="jp-carousel-pagination"></div> </div> <div class="jp-carousel-photo-title-container"> <h2 class="jp-carousel-photo-caption"></h2> </div> <div class="jp-carousel-photo-icons-container"> <a href="#" class="jp-carousel-icon-btn jp-carousel-icon-info" aria-label="Toggle photo metadata visibility"> <span class="jp-carousel-icon"> <svg width="25" height="24" viewBox="0 0 25 24" fill="none" xmlns="http://www.w3.org/2000/svg"> <mask id="maskInfo" mask-type="alpha" maskUnits="userSpaceOnUse" x="2" y="2" width="21" height="20"> <path fill-rule="evenodd" clip-rule="evenodd" d="M12.7537 2C7.26076 2 2.80273 6.48 2.80273 12C2.80273 17.52 7.26076 22 12.7537 22C18.2466 22 22.7046 17.52 22.7046 12C22.7046 6.48 18.2466 2 12.7537 2ZM11.7586 7V9H13.7488V7H11.7586ZM11.7586 11V17H13.7488V11H11.7586ZM4.79292 12C4.79292 16.41 8.36531 20 12.7537 20C17.142 20 20.7144 16.41 20.7144 12C20.7144 7.59 17.142 4 12.7537 4C8.36531 4 4.79292 7.59 4.79292 12Z" fill="white"/> </mask> <g mask="url(#maskInfo)"> <rect x="0.8125" width="23.8823" height="24" fill="#FFFFFF"/> </g> </svg> </span> </a> <a href="#" class="jp-carousel-icon-btn jp-carousel-icon-comments" aria-label="Toggle photo comments visibility"> <span class="jp-carousel-icon"> <svg width="25" height="24" viewBox="0 0 25 24" fill="none" xmlns="http://www.w3.org/2000/svg"> <mask id="maskComments" mask-type="alpha" maskUnits="userSpaceOnUse" x="2" y="2" width="21" height="20"> <path fill-rule="evenodd" clip-rule="evenodd" d="M4.3271 2H20.2486C21.3432 2 22.2388 2.9 22.2388 4V16C22.2388 17.1 21.3432 18 20.2486 18H6.31729L2.33691 22V4C2.33691 2.9 3.2325 2 4.3271 2ZM6.31729 16H20.2486V4H4.3271V18L6.31729 16Z" fill="white"/> </mask> <g mask="url(#maskComments)"> <rect x="0.34668" width="23.8823" height="24" fill="#FFFFFF"/> </g> </svg> <span class="jp-carousel-has-comments-indicator" aria-label="This image has comments."></span> </span> </a> </div> </div> <div class="jp-carousel-info-extra"> <div class="jp-carousel-info-content-wrapper"> <div class="jp-carousel-photo-title-container"> <h2 class="jp-carousel-photo-title"></h2> </div> <div class="jp-carousel-comments-wrapper"> <div id="jp-carousel-comments-loading"> <span>Loading Comments...</span> </div> <div class="jp-carousel-comments"></div> <div id="jp-carousel-comment-form-container"> <span id="jp-carousel-comment-form-spinner"> </span> <div id="jp-carousel-comment-post-results"></div> <form id="jp-carousel-comment-form"> <label for="jp-carousel-comment-form-comment-field" class="screen-reader-text">Write a Comment...</label> <textarea name="comment" class="jp-carousel-comment-form-field jp-carousel-comment-form-textarea" id="jp-carousel-comment-form-comment-field" placeholder="Write a Comment..." ></textarea> <div id="jp-carousel-comment-form-submit-and-info-wrapper"> <div id="jp-carousel-comment-form-commenting-as"> <fieldset> <label for="jp-carousel-comment-form-email-field">Email (Required)</label> <input type="text" name="email" class="jp-carousel-comment-form-field jp-carousel-comment-form-text-field" id="jp-carousel-comment-form-email-field" /> </fieldset> <fieldset> <label for="jp-carousel-comment-form-author-field">Name (Required)</label> <input type="text" name="author" class="jp-carousel-comment-form-field jp-carousel-comment-form-text-field" id="jp-carousel-comment-form-author-field" /> </fieldset> <fieldset> <label for="jp-carousel-comment-form-url-field">Website</label> <input type="text" name="url" class="jp-carousel-comment-form-field jp-carousel-comment-form-text-field" id="jp-carousel-comment-form-url-field" /> </fieldset> </div> <input type="submit" name="submit" class="jp-carousel-comment-form-button" id="jp-carousel-comment-form-button-submit" value="Post Comment" /> </div> </form> </div> </div> <div class="jp-carousel-image-meta"> <div class="jp-carousel-title-and-caption"> <div class="jp-carousel-photo-info"> <h3 class="jp-carousel-caption" itemprop="caption description"></h3> </div> <div class="jp-carousel-photo-description"></div> </div> <ul class="jp-carousel-image-exif" style="display: none;"></ul> <a class="jp-carousel-image-download" href="#" target="_blank" style="display: none;"> <svg width="25" height="24" viewBox="0 0 25 24" fill="none" xmlns="http://www.w3.org/2000/svg"> <mask id="mask0" mask-type="alpha" maskUnits="userSpaceOnUse" x="3" y="3" width="19" height="18"> <path fill-rule="evenodd" clip-rule="evenodd" d="M5.84615 5V19H19.7775V12H21.7677V19C21.7677 20.1 20.8721 21 19.7775 21H5.84615C4.74159 21 3.85596 20.1 3.85596 19V5C3.85596 3.9 4.74159 3 5.84615 3H12.8118V5H5.84615ZM14.802 5V3H21.7677V10H19.7775V6.41L9.99569 16.24L8.59261 14.83L18.3744 5H14.802Z" fill="white"/> </mask> <g mask="url(#mask0)"> <rect x="0.870605" width="23.8823" height="24" fill="#FFFFFF"/> </g> </svg> <span class="jp-carousel-download-text"></span> </a> <div class="jp-carousel-image-map" style="display: none;"></div> </div> </div> </div> </div> </div> </div> <script type="text/javascript"> window.WPCOM_sharing_counts = {"https:\/\/platypus.asn.au\/weir-walls-and-fishways\/":6162}; </script> <link rel='stylesheet' id='all-css-867e70fe53ef820c94e92386f6f608bd' href='https://platypus.asn.au/_static/??-eJyVT8sKAjEM/CFrWMG1F/FTpKahRNu0NC3Fv1dY97ag3oZ5MTOKwSyNpEGJPbAo3KkVhw9I2fdICuhq7koRdHCham5dfKQ9qu7GH+mPYFbiW8GVBSGQUOW3RbfhrysG+0BNQTOyiyaRZ2eWMm3P5c0lnaf5dJiO1s72Bc14asI=' type='text/css' media='all' /> <style id='core-block-supports-inline-css'> .wp-block-gallery.wp-block-gallery-1{--wp--style--unstable-gallery-gap:var( --wp--style--gallery-gap-default, var( --gallery-block--gutter-size, var( --wp--style--block-gap, 0.5em ) ) );gap:var( --wp--style--gallery-gap-default, var( --gallery-block--gutter-size, var( --wp--style--block-gap, 0.5em ) ) );}.wp-block-gallery.wp-block-gallery-2{--wp--style--unstable-gallery-gap:var( --wp--style--gallery-gap-default, var( --gallery-block--gutter-size, var( --wp--style--block-gap, 0.5em ) ) );gap:var( --wp--style--gallery-gap-default, var( --gallery-block--gutter-size, var( --wp--style--block-gap, 0.5em ) ) );} </style> <script type="text/javascript" id="custom-content-types-data-js-before"> /* <![CDATA[ */ var CUSTOM_CONTENT_TYPE__INITIAL_STATE; typeof CUSTOM_CONTENT_TYPE__INITIAL_STATE === "object" || (CUSTOM_CONTENT_TYPE__INITIAL_STATE = JSON.parse(decodeURIComponent("%7B%22active%22%3Atrue%2C%22over_ride%22%3Afalse%2C%22should_show_testimonials%22%3Atrue%2C%22should_show_portfolios%22%3Atrue%7D"))); /* ]]> */ </script> <script type="text/javascript" id="coblocks-tinyswiper-initializer-js-extra"> /* <![CDATA[ */ var coblocksTinyswiper = {"carouselPrevButtonAriaLabel":"Previous","carouselNextButtonAriaLabel":"Next","sliderImageAriaLabel":"Image"}; /* ]]> */ </script> <script type='text/javascript' src='https://platypus.asn.au/_static/??-eJyNjkGOwjAQBD+EGRCREAfEU5BxhtCxMzbMmMC+fomQdg+AxLXV1V1jcSGLsRiVVDuIUsiHlENUaqFG/X/gvGDwhizzXmfjF+SVpc0XJYPcnY4ofPkW/Tud2CfqIDD4hJ+XGTvxwEqdNx79feLFX9G9k32takRxCRLdMYeq7ojbB8uerfgQaQ8JdKhILSXEx9q5cuWTlzY91AZMn7thu1w3i2a5Wa+aX5QSiFE='></script> <script type="text/javascript" src="https://stats.wp.com/e-202509.js" id="jetpack-stats-js" data-wp-strategy="defer"></script> <script type="text/javascript" id="jetpack-stats-js-after"> /* <![CDATA[ */ _stq = window._stq || []; _stq.push([ "view", JSON.parse("{\"v\":\"ext\",\"blog\":\"120180180\",\"post\":\"6162\",\"tz\":\"10\",\"srv\":\"platypus.asn.au\",\"hp\":\"atomic\",\"ac\":\"2\",\"amp\":\"0\",\"j\":\"1:14.4-a.7\"}") ]); _stq.push([ "clickTrackerInit", "120180180", "6162" ]); /* ]]> */ </script> <script type="text/javascript" id="jetpack-carousel-js-extra"> /* <![CDATA[ */ var jetpackSwiperLibraryPath = {"url":"https:\/\/platypus.asn.au\/wp-content\/plugins\/jetpack\/_inc\/build\/carousel\/swiper-bundle.min.js"}; var jetpackCarouselStrings = {"widths":[370,700,1000,1200,1400,2000],"is_logged_in":"","lang":"en","ajaxurl":"https:\/\/platypus.asn.au\/wp-admin\/admin-ajax.php","nonce":"30cd47722f","display_exif":"1","display_comments":"1","single_image_gallery":"1","single_image_gallery_media_file":"","background_color":"black","comment":"Comment","post_comment":"Post Comment","write_comment":"Write a Comment...","loading_comments":"Loading Comments...","image_label":"Open image in full-screen.","download_original":"View full size <span class=\"photo-size\">{0}<span class=\"photo-size-times\">\u00d7<\/span>{1}<\/span>","no_comment_text":"Please be sure to submit some text with your comment.","no_comment_email":"Please provide an email address to comment.","no_comment_author":"Please provide your name to comment.","comment_post_error":"Sorry, but there was an error posting your comment. Please try again later.","comment_approved":"Your comment was approved.","comment_unapproved":"Your comment is in moderation.","camera":"Camera","aperture":"Aperture","shutter_speed":"Shutter Speed","focal_length":"Focal Length","copyright":"Copyright","comment_registration":"0","require_name_email":"1","login_url":"https:\/\/platypus.asn.au\/wp-login.php?redirect_to=https%3A%2F%2Fplatypus.asn.au%2Fweir-walls-and-fishways%2F","blog_id":"1","meta_data":["camera","aperture","shutter_speed","focal_length","copyright"]}; /* ]]> */ </script> <script type='text/javascript' src='https://platypus.asn.au/wp-content/plugins/jetpack/_inc/build/carousel/jetpack-carousel.min.js?m=1734358916'></script> <script type="text/javascript" id="sharing-js-js-extra"> /* <![CDATA[ */ var sharing_js_options = {"lang":"en","counts":"1","is_stats_active":"1"}; /* ]]> */ </script> <script type="text/javascript" src="https://platypus.asn.au/wp-content/plugins/jetpack/_inc/build/sharedaddy/sharing.min.js?ver=14.4-a.7" id="sharing-js-js"></script> <script type="text/javascript" id="sharing-js-js-after"> /* <![CDATA[ */ var windowOpen; ( function () { function matches( el, sel ) { return !! ( el.matches && el.matches( sel ) || el.msMatchesSelector && el.msMatchesSelector( sel ) ); } document.body.addEventListener( 'click', function ( event ) { if ( ! event.target ) { return; } var el; if ( matches( event.target, 'a.share-facebook' ) ) { el = event.target; } else if ( event.target.parentNode && matches( event.target.parentNode, 'a.share-facebook' ) ) { el = event.target.parentNode; } if ( el ) { event.preventDefault(); // If there's another sharing window open, close it. if ( typeof windowOpen !== 'undefined' ) { windowOpen.close(); } windowOpen = window.open( el.getAttribute( 'href' ), 'wpcomfacebook', 'menubar=1,resizable=1,width=600,height=400' ); return false; } } ); } )(); var windowOpen; ( function () { function matches( el, sel ) { return !! ( el.matches && el.matches( sel ) || el.msMatchesSelector && el.msMatchesSelector( sel ) ); } document.body.addEventListener( 'click', function ( event ) { if ( ! event.target ) { return; } var el; if ( matches( event.target, 'a.share-twitter' ) ) { el = event.target; } else if ( event.target.parentNode && matches( event.target.parentNode, 'a.share-twitter' ) ) { el = event.target.parentNode; } if ( el ) { event.preventDefault(); // If there's another sharing window open, close it. if ( typeof windowOpen !== 'undefined' ) { windowOpen.close(); } windowOpen = window.open( el.getAttribute( 'href' ), 'wpcomtwitter', 'menubar=1,resizable=1,width=600,height=350' ); return false; } } ); } )(); /* ]]> */ </script> <iframe src='https://widgets.wp.com/likes/master.html?ver=20250226#ver=20250226' scrolling='no' id='likes-master' name='likes-master' style='display:none;'></iframe> <div id='likes-other-gravatars' role="dialog" aria-hidden="true" tabindex="-1"><div class="likes-text"><span>%d</span></div><ul class="wpl-avatars sd-like-gravatars"></ul></div> </body> </html>