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However, due to logistical constraints associated with conventional SCUBA diving, deeper habitats, such as vertical rocky reefs, are rarely studied and poorly known. This paper describes the Deep Vertical Transect (DVT) method as a safe and effective method for assessing fish in waters up to 50 m of depth. It is based on sampling of vertical transects browsing within it (S-type transect) by divers using Full HD video cameras. The diving profile includes the use of deep decompression stops and Nitrox 50 as a decompression gas. Hence, the study yields information on fish assemblages associated with deeper vertical coralligenous reefs. The results of 51 recorded species, yielded 41 considered as reef-associated and 10 as occasional. This suggests that underwater steep coralligenous reefs are marine biodiversity hotspots. They may be considered to represent a distinctive marine subecosystem, possessing its own food chain, with the depth, in relation to temperature, as the most important factor responsible for the diversity of fish assemblages within this habitat.","publication_date":"2020,10,2","publication_name":"Turkish Journal of Fisheries and Aquatic Sciences","grobid_abstract_attachment_id":"109739099"},"document_type":"paper","pre_hit_view_count_baseline":null,"quality":"high","language":"en","title":"Underwater Visual Census of Deeper Vertical Rocky Reefs","broadcastable":false,"draft":null,"has_indexable_attachment":true,"indexable":true}}["work"]; window.loswp.workCoauthors = [59964222]; window.loswp.locale = "en"; window.loswp.countryCode = "SG"; window.loswp.cwvAbTestBucket = ""; window.loswp.designVariant = "ds_vanilla"; window.loswp.fullPageMobileSutdModalVariant = "full_page_mobile_sutd_modal"; window.loswp.useOptimizedScribd4genScript = false; window.loswp.appleClientId = 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class="material-symbols-outlined" style="font-size: 20px" translate="no">download</span><p>Download Free PDF</p></div><div class="ds-work-cover--ribbon-container">Download Free PDF</div><div class="ds-work-cover--ribbon-triangle"></div></button></div></div></div><div class="ds-work-card--work-information"><h1 class="ds-work-card--work-title">Underwater Visual Census of Deeper Vertical Rocky Reefs</h1><div class="ds-work-card--work-authors ds-work-card--detail"><a class="ds-work-card--author js-wsj-grid-card-author ds2-5-body-md ds2-5-body-link" data-author-id="59964222" href="https://independent.academia.edu/iglavi%C4%8Di%C4%87"><img alt="Profile image of igor glavičić" class="ds-work-card--author-avatar" src="https://0.academia-photos.com/59964222/21216024/20661689/s65_igor.glavi_i_.jpg" />igor glavičić</a></div><div class="ds-work-card--detail"><p class="ds-work-card--detail ds2-5-body-sm">2020, Turkish Journal of Fisheries and Aquatic Sciences</p></div><div class="ds-work-card--button-container"><button class="ds2-5-button js-swp-download-button" data-signup-modal="{"location":"continue-reading-button--work-card","attachmentId":109739099,"attachmentType":"pdf","workUrl":"https://www.academia.edu/112539447/Underwater_Visual_Census_of_Deeper_Vertical_Rocky_Reefs"}">See full PDF</button><button class="ds2-5-button ds2-5-button--secondary js-swp-download-button" data-signup-modal="{"location":"download-pdf-button--work-card","attachmentId":109739099,"attachmentType":"pdf","workUrl":"https://www.academia.edu/112539447/Underwater_Visual_Census_of_Deeper_Vertical_Rocky_Reefs"}"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">download</span>Download PDF</button></div></div></div></div><div data-auto_select="false" data-client_id="331998490334-rsn3chp12mbkiqhl6e7lu2q0mlbu0f1b" data-doc_id="109739099" data-landing_url="https://www.academia.edu/112539447/Underwater_Visual_Census_of_Deeper_Vertical_Rocky_Reefs" data-login_uri="https://www.academia.edu/registrations/google_one_tap" data-moment_callback="onGoogleOneTapEvent" id="g_id_onload"></div><div class="ds-top-related-works--grid-container"><div class="ds-related-content--container ds-top-related-works--container"><h2 class="ds-related-content--heading">Related papers</h2><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="0" data-entity-id="31377557" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/31377557/UNDERWATER_VISUAL_CENSUS_UVC_OF_VERTICAL_REEFS">UNDERWATER VISUAL CENSUS (UVC) OF VERTICAL REEFS</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="59964222" href="https://independent.academia.edu/iglavi%C4%8Di%C4%87">igor glavičić</a></div><p class="ds-related-work--abstract ds2-5-body-sm">Underwater visual census (UVC) methods have started to be used extensively for the first time in coral reef fish studies of population dynamics, ecology and management. As non-destructive method, compared to standard methods using fishing gear, later it was adopted for fishery purposes research and at different habitats. In a fisheries context visual census estimates of fish abundance are particularly useful because they are independent of standard fishing methods. Visual census methods can provide rapid estimates of relative abundance, biomass, and length frequency distributions of fish. For this reason, UVC methods have been used to census a wide range of demersal and coastal species that are taken by shallow water fisheries in infralittoral and circalittoral zone. There are several different sub-methods of UVC, however, all of them are based on research of horizontal areas at depths mainly to 15 m, rarely exceeding 20 m. The main reasons for such depth limits during research are diving restrictions and standardized procedures. In this paper a new method of UVC for vertical reefs up to 50 m of depth is described. It is based on transect method were the length of transect is 50 m, while the depth of each transect is 5 m. Two same observers, trained in species identification, are used and HD video recording, for subsequent analysis, is applied. Vertical reef location is modeled using AutoCad. Using 3D system and X, Y and Z axes, vertical reef is shown in perspective view from surface to 50 m of depth. Combining 3D model with biological and ecological records obtained at each depth transect, such as identified algae and sessile organisms, fish species and temperature data, can provide a detailed representation of specific marine environment and better knowledge of complex interactions between species and their habitat.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"UNDERWATER VISUAL CENSUS (UVC) OF VERTICAL REEFS","attachmentId":51754007,"attachmentType":"pdf","work_url":"https://www.academia.edu/31377557/UNDERWATER_VISUAL_CENSUS_UVC_OF_VERTICAL_REEFS","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/31377557/UNDERWATER_VISUAL_CENSUS_UVC_OF_VERTICAL_REEFS"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="1" data-entity-id="23756510" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/23756510/Video_transects_are_the_most_appropriate_underwater_visual_census_method_for_surveying_high_latitude_coral_reef_fishes_in_the_southwestern_Indian_Ocean">Video transects are the most appropriate underwater visual census method for surveying high-latitude coral reef fishes in the southwestern Indian Ocean</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="45967773" href="https://independent.academia.edu/ReeceWartenberg">Reece Wartenberg</a></div><p class="ds-related-work--abstract ds2-5-body-sm">Pilot studies are used to assess different sampling and monitoring protocols when developing long-term monitoring programs (LTMPs). Considering that the ultimate goal of LTMPs is preservation-orientated, non-destructive sampling methods are favoured. For coral reef fishes, underwater visual censuses (UVCs) have become the method of choice for surveying shallow, highly-diverse reefs. This study assessed three different UVC transect types to monitor high-latitude western Indian Ocean coral reefs; these were slate, photo and video transects. Slate data were analysed with CountN (all fish observed), while footage from reviewable photo and video transects was analysed by both CountN and MaxN (a single frame with the most fish per species), resulting in an assessment of five transect-type analysis technique combinations ; slate, photo-CountN, video-CountN, photo-MaxN and video-MaxN. Video-CountN transects had the highest estimates of richness and abundance, the lowest variability, and the most representative diversity. Video-CountN transects were also the most efficient in that the time taken to analyse footage was comparable to the other combinations considered, the proportion of unidentifiable individuals was low, and it required the lowest sample size to achieve an acceptable statistical power. Video-CountN transecting is therefore recommended as the most appropriate method for conducting UVCs of high-latitude coral reef fishes in the southwestern Indian Ocean.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Video transects are the most appropriate underwater visual census method for surveying high-latitude coral reef fishes in the southwestern Indian Ocean","attachmentId":44185381,"attachmentType":"pdf","work_url":"https://www.academia.edu/23756510/Video_transects_are_the_most_appropriate_underwater_visual_census_method_for_surveying_high_latitude_coral_reef_fishes_in_the_southwestern_Indian_Ocean","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/23756510/Video_transects_are_the_most_appropriate_underwater_visual_census_method_for_surveying_high_latitude_coral_reef_fishes_in_the_southwestern_Indian_Ocean"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="2" data-entity-id="68483832" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/68483832/On_the_underwater_visual_census_of_Western_Indian_Ocean_coral_reef_fishes">On the underwater visual census of Western Indian Ocean coral reef fishes</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="45967773" href="https://independent.academia.edu/ReeceWartenberg">Reece Wartenberg</a></div><p class="ds-related-work--metadata ds2-5-body-xs">2012</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"On the underwater visual census of Western Indian Ocean coral reef fishes","attachmentId":78942680,"attachmentType":"pdf","work_url":"https://www.academia.edu/68483832/On_the_underwater_visual_census_of_Western_Indian_Ocean_coral_reef_fishes","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/68483832/On_the_underwater_visual_census_of_Western_Indian_Ocean_coral_reef_fishes"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="3" data-entity-id="27996002" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/27996002/Comparison_of_visual_census_and_high_definition_video_transects_for_monitoring_coral_reef_fish_assemblages">Comparison of visual census and high definition video transects for monitoring coral reef fish assemblages</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="52496106" href="https://univ-reunion.academia.edu/PascaleChabanet">Pascale Chabanet</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Fisheries Research, 2011</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Comparison of visual census and high definition video transects for monitoring coral reef fish assemblages","attachmentId":48302124,"attachmentType":"pdf","work_url":"https://www.academia.edu/27996002/Comparison_of_visual_census_and_high_definition_video_transects_for_monitoring_coral_reef_fish_assemblages","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/27996002/Comparison_of_visual_census_and_high_definition_video_transects_for_monitoring_coral_reef_fish_assemblages"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="4" data-entity-id="20762841" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/20762841/Evaluating_the_use_of_roving_diver_and_transect_surveys_to_assess_the_coral_reef_fish_assemblage_off_southeastern_Hispaniola">Evaluating the use of roving diver and transect surveys to assess the coral reef fish assemblage off southeastern Hispaniola</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="11821549" href="https://miami.academia.edu/KSullivanSealey">Kathleen Sullivan Sealey</a><span>, </span><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="11111343" href="https://independent.academia.edu/RobertSluka">Robert Sluka</a></div><p class="ds-related-work--abstract ds2-5-body-sm">The relatively little-studied fish fauna off southeastern Hispaniola was rapidly assessed using a combination of visual survey techniques including transects and roving diver surveys. It was found that when combined, both methods provided a more complete overall species assessment than either method was able to provide in isolation. Being able to conduct rapid species assessments is becoming increasingly more important as a conservation tool. Data on species composition , sighting frequency, and abundance of all fishes were collected using both methods. Abundance was recorded in four logarithmic-based categories (roving diver method) while the number of fishes were counted within 40-m 2 transects (transect method). Both methods were similar in recording the most abundant species, while a greater number of rare species (especially fishery-targeted species) were recorded with the roving diver method. The most abundant groupers were Cephalo-pholis cruentata and C. fulva. The most abundant parrotfishes were Scarus taeniopterus, Sparisoma auro-frenatum, and Scarus iserti. The most conspicuous differences between fishes off southeastern Hispaniola and elsewhere in the tropical western Atlantic were the low abundance and smaller size of harvested species such as groupers, snappers (Fam. Lutjanidae), and grunts (Fam. Haemulidae). With the roving diver method, more time could be spent surveying (instead of placing transect lines), resulting in a greater number of species being recorded. Additionally, well-trained volunteers can adopt the roving diver method as part of their regular diving program. Transect surveys were able to provide information such as length (biomass) and actual density measures that were not recorded in roving diver surveys. Thus, these methods were complementary and should be used in conjunction when conducting rapid assessments of fish assemblages, especially to detect the effects of overfishing.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Evaluating the use of roving diver and transect surveys to assess the coral reef fish assemblage off southeastern Hispaniola","attachmentId":41547853,"attachmentType":"pdf","work_url":"https://www.academia.edu/20762841/Evaluating_the_use_of_roving_diver_and_transect_surveys_to_assess_the_coral_reef_fish_assemblage_off_southeastern_Hispaniola","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/20762841/Evaluating_the_use_of_roving_diver_and_transect_surveys_to_assess_the_coral_reef_fish_assemblage_off_southeastern_Hispaniola"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="5" data-entity-id="55501213" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/55501213/Taking_a_deeper_look_Quantifying_the_differences_in_fish_assemblages_between_shallow_and_mesophotic_temperate_rocky_reefs">Taking a deeper look: Quantifying the differences in fish assemblages between shallow and mesophotic temperate rocky reefs</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="38391847" href="https://independent.academia.edu/TimIngleton">Tim Ingleton</a></div><p class="ds-related-work--metadata ds2-5-body-xs">PLOS ONE</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Taking a deeper look: Quantifying the differences in fish assemblages between shallow and mesophotic temperate rocky reefs","attachmentId":71341971,"attachmentType":"pdf","work_url":"https://www.academia.edu/55501213/Taking_a_deeper_look_Quantifying_the_differences_in_fish_assemblages_between_shallow_and_mesophotic_temperate_rocky_reefs","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/55501213/Taking_a_deeper_look_Quantifying_the_differences_in_fish_assemblages_between_shallow_and_mesophotic_temperate_rocky_reefs"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="6" data-entity-id="28833078" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/28833078/Descending_to_the_twilight_zone_changes_in_coral_reef_fish_assemblages_along_a_depth_gradient_down_to_65_m">Descending to the twilight-zone: changes in coral reef fish assemblages along a depth gradient down to 65 m</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="54280994" href="https://independent.academia.edu/SalitKark">Salit Kark</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Marine Ecology Progress Series, 2008</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Descending to the twilight-zone: changes in coral reef fish assemblages along a depth gradient down to 65 m","attachmentId":49251729,"attachmentType":"pdf","work_url":"https://www.academia.edu/28833078/Descending_to_the_twilight_zone_changes_in_coral_reef_fish_assemblages_along_a_depth_gradient_down_to_65_m","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/28833078/Descending_to_the_twilight_zone_changes_in_coral_reef_fish_assemblages_along_a_depth_gradient_down_to_65_m"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="7" data-entity-id="14989435" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/14989435/Using_underwater_cameras_to_assess_the_effects_of_snorkeler_and_SCUBA_diver_presence_on_coral_reef_fish_abundance_family_richness_and_species_composition">Using underwater cameras to assess the effects of snorkeler and SCUBA diver presence on coral reef fish abundance, family richness, and species composition</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="34137018" href="https://questu.academia.edu/MYasu%C3%A9">M. Yasué</a><span>, </span><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="33985127" href="https://independent.academia.edu/PhilipDearden">Philip Dearden</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Environmental Monitoring and Assessment, 2010</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Using underwater cameras to assess the effects of snorkeler and SCUBA diver presence on coral reef fish abundance, family richness, and species composition","attachmentId":43671499,"attachmentType":"pdf","work_url":"https://www.academia.edu/14989435/Using_underwater_cameras_to_assess_the_effects_of_snorkeler_and_SCUBA_diver_presence_on_coral_reef_fish_abundance_family_richness_and_species_composition","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/14989435/Using_underwater_cameras_to_assess_the_effects_of_snorkeler_and_SCUBA_diver_presence_on_coral_reef_fish_abundance_family_richness_and_species_composition"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="8" data-entity-id="112539445" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/112539445/The_influence_of_depth_on_the_Mediterranean_reef_fish_assemblage_revealed_by_the_new_video_on_underwater_scooter_method">The influence of depth on the Mediterranean reef fish assemblage revealed by the new video on underwater scooter method</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="59964222" href="https://independent.academia.edu/iglavi%C4%8Di%C4%87">igor glavičić</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Acta Adriatica: International Journal of Marine Sciences, 2020</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"The influence of depth on the Mediterranean reef fish assemblage revealed by the new video on underwater scooter method","attachmentId":109739154,"attachmentType":"pdf","work_url":"https://www.academia.edu/112539445/The_influence_of_depth_on_the_Mediterranean_reef_fish_assemblage_revealed_by_the_new_video_on_underwater_scooter_method","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/112539445/The_influence_of_depth_on_the_Mediterranean_reef_fish_assemblage_revealed_by_the_new_video_on_underwater_scooter_method"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="9" data-entity-id="96383887" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/96383887/Sampling_errors_and_variability_in_video_transects_for_assessment_of_reef_fish_assemblage_structure_and_diversity">Sampling errors and variability in video transects for assessment of reef fish assemblage structure and diversity</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="49161621" href="https://ugent.academia.edu/WoutEchelpoel">Wout Van Echelpoel</a></div><p class="ds-related-work--metadata ds2-5-body-xs">PLOS ONE</p><p class="ds-related-work--abstract ds2-5-body-sm">Video monitoring is a rapidly evolving tool in aquatic ecological research because of its non-destructive ability to assess fish assemblages. Nevertheless, methodological considerations of video monitoring techniques are often overlooked, especially in more complex sampling designs, causing inefficient data collection, processing, and interpretation. In this study, we discuss how video transect sampling designs could be assessed and how the inter-observer variability, design errors and sampling variability should be quantified and accounted for. The study took place in the coastal areas of the Galapagos archipelago and consisted of a hierarchical repeated-observations sampling design with multiple observers. Although observer bias was negligible for the assessment of fish assemblage structure, diversity and counts of individual species, sampling variability caused by simple counting/detection errors, observer effects and instantaneous fish displacement was often important. Especiall...</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Sampling errors and variability in video transects for assessment of reef fish assemblage structure and diversity","attachmentId":98296569,"attachmentType":"pdf","work_url":"https://www.academia.edu/96383887/Sampling_errors_and_variability_in_video_transects_for_assessment_of_reef_fish_assemblage_structure_and_diversity","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/96383887/Sampling_errors_and_variability_in_video_transects_for_assessment_of_reef_fish_assemblage_structure_and_diversity"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div></div></div><div class="ds-sticky-ctas--wrapper js-loswp-sticky-ctas hidden"><div class="ds-sticky-ctas--grid-container"><div class="ds-sticky-ctas--container"><button class="ds2-5-button js-swp-download-button" data-signup-modal="{"location":"continue-reading-button--sticky-ctas","attachmentId":109739099,"attachmentType":"pdf","workUrl":null}">See full PDF</button><button class="ds2-5-button ds2-5-button--secondary js-swp-download-button" data-signup-modal="{"location":"download-pdf-button--sticky-ctas","attachmentId":109739099,"attachmentType":"pdf","workUrl":null}"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">download</span>Download PDF</button></div></div></div><div class="ds-below-fold--grid-container"><div class="ds-work--container js-loswp-embedded-document"><div class="attachment_preview" data-attachment="Attachment_109739099" style="display: none"><div class="js-scribd-document-container"><div class="scribd--document-loading js-scribd-document-loader" style="display: block;"><img alt="Loading..." src="//a.academia-assets.com/images/loaders/paper-load.gif" /><p>Loading Preview</p></div></div><div style="text-align: center;"><div class="scribd--no-preview-alert js-preview-unavailable"><p>Sorry, preview is currently unavailable. 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class="ds-related-work--metadata ds2-5-body-xs">Frontiers in Marine Science, 2019</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Depth-Dependent Structuring of Reef Fish Assemblages From the Shallows to the Rariphotic Zone","attachmentId":91394236,"attachmentType":"pdf","work_url":"https://www.academia.edu/87083063/Depth_Dependent_Structuring_of_Reef_Fish_Assemblages_From_the_Shallows_to_the_Rariphotic_Zone","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-related-work-grid-card-view-pdf" href="https://www.academia.edu/87083063/Depth_Dependent_Structuring_of_Reef_Fish_Assemblages_From_the_Shallows_to_the_Rariphotic_Zone"><span 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Crec'Hriou</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Aquatic Biology, 2013</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Video transects as a complement to underwater visual census to study reserve effect on fish assemblages","attachmentId":45232868,"attachmentType":"pdf","work_url":"https://www.academia.edu/13538638/Video_transects_as_a_complement_to_underwater_visual_census_to_study_reserve_effect_on_fish_assemblages","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-related-work-grid-card-view-pdf" href="https://www.academia.edu/13538638/Video_transects_as_a_complement_to_underwater_visual_census_to_study_reserve_effect_on_fish_assemblages"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-related-work-sidebar-card" data-collection-position="4" data-entity-id="112314843" data-sort-order="default"><a class="ds-related-work--title js-related-work-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/112314843/How_many_fish_Comparison_of_two_underwater_visual_sampling_methods_for_monitoring_fish_communities">How many fish? 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