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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ftdoajarticles:oai:doaj.org/article:2a0eda35565e4018b8f91776abf80ded 2023-05-15T15:39:05+02:00 Deep vision: an in-trawl stereo camera makes a step forward in monitoring the pelagic community. Melanie J Underwood Shale Rosen Arill Engås Elena Eriksen 2014-01-01T00:00:00Z https://doi.org/10.1371/journal.pone.0112304 https://doaj.org/article/2a0eda35565e4018b8f91776abf80ded EN eng Public Library of Science (PLoS) http://europepmc.org/articles/PMC4230979?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0112304 https://doaj.org/article/2a0eda35565e4018b8f91776abf80ded PLoS ONE, Vol 9, Iss 11, p e112304 (2014) Medicine R Science Q article 2014 ftdoajarticles https://doi.org/10.1371/journal.pone.0112304 2022-12-31T07:19:24Z 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. Article in Journal/Newspaper Barents Sea Boreogadus saida Gadus morhua Directory of Open Access Journals: DOAJ Articles Barents Sea Norway PLoS ONE 9 11 e112304 |
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Directory of Open Access Journals: DOAJ Articles |
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English |
topic |
Medicine R Science Q |
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Medicine R Science Q Melanie J Underwood Shale Rosen Arill Engås Elena Eriksen Deep vision: an in-trawl stereo camera makes a step forward in monitoring the pelagic community. |
topic_facet |
Medicine R Science Q |
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 |
Article in Journal/Newspaper |
author |
Melanie J Underwood Shale Rosen Arill Engås Elena Eriksen |
author_facet |
Melanie J Underwood Shale Rosen Arill Engås Elena Eriksen |
author_sort |
Melanie J Underwood |
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 (PLoS) |
publishDate |
2014 |
url |
https://doi.org/10.1371/journal.pone.0112304 https://doaj.org/article/2a0eda35565e4018b8f91776abf80ded |
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_source |
PLoS ONE, Vol 9, Iss 11, p e112304 (2014) |
op_relation |
http://europepmc.org/articles/PMC4230979?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0112304 https://doaj.org/article/2a0eda35565e4018b8f91776abf80ded |
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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11 |
container_start_page |
e112304 |
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