Deep Vision: An In-Trawl Stereo Camera Makes a Step Forward in Monitoring the Pelagic Community
Ecosystem surveys are carried out annually in the Barents Sea by Russia and Norway to monitor the spatial distribution of ecosystem components and to study population dynamics. One component of the survey is mapping the upper pelagic zone using a trawl towed at several depths. However, the current t...
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ftpubmed:oai:pubmedcentral.nih.gov:4230979 2023-05-15T15:39:05+02:00 Deep Vision: An In-Trawl Stereo Camera Makes a Step Forward in Monitoring the Pelagic Community Underwood, Melanie J. Rosen, Shale Engås, Arill Eriksen, Elena 2014-11-13 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4230979 http://www.ncbi.nlm.nih.gov/pubmed/25393121 https://doi.org/10.1371/journal.pone.0112304 en eng Public Library of Science http://www.ncbi.nlm.nih.gov/pmc/articles/PMC http://www.ncbi.nlm.nih.gov/pubmed/25393121 http://dx.doi.org/10.1371/journal.pone.0112304 This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. CC-BY Research Article Text 2014 ftpubmed https://doi.org/10.1371/journal.pone.0112304 2014-11-23T00:57:02Z Ecosystem surveys are carried out annually in the Barents Sea by Russia and Norway to monitor the spatial distribution of ecosystem components and to study population dynamics. One component of the survey is mapping the upper pelagic zone using a trawl towed at several depths. However, the current technique with a single codend does not provide fine-scale spatial data needed to directly study species overlaps. An in-trawl camera system, Deep Vision, was mounted in front of the codend in order to acquire continuous images of all organisms passing. It was possible to identify and quantify of most young-of-the-year fish (e.g. Gadus morhua, Boreogadus saida and Reinhardtius hippoglossoides) and zooplankton, including Ctenophora, which are usually damaged in the codend. The system showed potential for measuring the length of small organisms and also recorded the vertical and horizontal positions where individuals were imaged. Young-of-the-year fish were difficult to identify when passing the camera at maximum range and to quantify during high densities. In addition, a large number of fish with damaged opercula were observed passing the Deep Vision camera during heaving; suggesting individuals had become entangled in meshes farther forward in the trawl. This indicates that unknown numbers of fish are probably lost in forward sections of the trawl and that the heaving procedure may influence the number of fish entering the codend, with implications for abundance indices and understanding population dynamics. This study suggests modifications to the Deep Vision and the trawl to increase our understanding of the population dynamics. Text Barents Sea Boreogadus saida Gadus morhua PubMed Central (PMC) Barents Sea Norway PLoS ONE 9 11 e112304 |
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Research Article Underwood, Melanie J. Rosen, Shale Engås, Arill Eriksen, Elena Deep Vision: An In-Trawl Stereo Camera Makes a Step Forward in Monitoring the Pelagic Community |
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Research Article |
description |
Ecosystem surveys are carried out annually in the Barents Sea by Russia and Norway to monitor the spatial distribution of ecosystem components and to study population dynamics. One component of the survey is mapping the upper pelagic zone using a trawl towed at several depths. However, the current technique with a single codend does not provide fine-scale spatial data needed to directly study species overlaps. An in-trawl camera system, Deep Vision, was mounted in front of the codend in order to acquire continuous images of all organisms passing. It was possible to identify and quantify of most young-of-the-year fish (e.g. Gadus morhua, Boreogadus saida and Reinhardtius hippoglossoides) and zooplankton, including Ctenophora, which are usually damaged in the codend. The system showed potential for measuring the length of small organisms and also recorded the vertical and horizontal positions where individuals were imaged. Young-of-the-year fish were difficult to identify when passing the camera at maximum range and to quantify during high densities. In addition, a large number of fish with damaged opercula were observed passing the Deep Vision camera during heaving; suggesting individuals had become entangled in meshes farther forward in the trawl. This indicates that unknown numbers of fish are probably lost in forward sections of the trawl and that the heaving procedure may influence the number of fish entering the codend, with implications for abundance indices and understanding population dynamics. This study suggests modifications to the Deep Vision and the trawl to increase our understanding of the population dynamics. |
format |
Text |
author |
Underwood, Melanie J. Rosen, Shale Engås, Arill Eriksen, Elena |
author_facet |
Underwood, Melanie J. Rosen, Shale Engås, Arill Eriksen, Elena |
author_sort |
Underwood, Melanie J. |
title |
Deep Vision: An In-Trawl Stereo Camera Makes a Step Forward in Monitoring the Pelagic Community |
title_short |
Deep Vision: An In-Trawl Stereo Camera Makes a Step Forward in Monitoring the Pelagic Community |
title_full |
Deep Vision: An In-Trawl Stereo Camera Makes a Step Forward in Monitoring the Pelagic Community |
title_fullStr |
Deep Vision: An In-Trawl Stereo Camera Makes a Step Forward in Monitoring the Pelagic Community |
title_full_unstemmed |
Deep Vision: An In-Trawl Stereo Camera Makes a Step Forward in Monitoring the Pelagic Community |
title_sort |
deep vision: an in-trawl stereo camera makes a step forward in monitoring the pelagic community |
publisher |
Public Library of Science |
publishDate |
2014 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4230979 http://www.ncbi.nlm.nih.gov/pubmed/25393121 https://doi.org/10.1371/journal.pone.0112304 |
geographic |
Barents Sea Norway |
geographic_facet |
Barents Sea Norway |
genre |
Barents Sea Boreogadus saida Gadus morhua |
genre_facet |
Barents Sea Boreogadus saida Gadus morhua |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC http://www.ncbi.nlm.nih.gov/pubmed/25393121 http://dx.doi.org/10.1371/journal.pone.0112304 |
op_rights |
This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1371/journal.pone.0112304 |
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PLoS ONE |
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9 |
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