Species-specific residence times in the aft part of a pelagic survey trawl: implications for inference of pre-capture spatial distribution using the Deep Vision system
Abstract In-trawl camera systems promise to improve the resolution of trawl sampling used to ground-truth the interpretation of acoustic survey data. In this study, the residence time of fish in front of the Deep Vision camera system, used to identify, measure and count fish inside the trawl, was an...
Published in: | ICES Journal of Marine Science |
---|---|
Main Authors: | , , , , |
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Oxford University Press (OUP)
2018
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1093/icesjms/fsx233 http://academic.oup.com/icesjms/article-pdf/75/4/1393/31236595/fsx233.pdf |
id |
croxfordunivpr:10.1093/icesjms/fsx233 |
---|---|
record_format |
openpolar |
spelling |
croxfordunivpr:10.1093/icesjms/fsx233 2024-09-15T17:55:32+00:00 Species-specific residence times in the aft part of a pelagic survey trawl: implications for inference of pre-capture spatial distribution using the Deep Vision system Underwood, Melanie J Rosen, Shale Engås, Arill Jørgensen, Terje Fernö, Anders O’Neill, Finbarr Research Council of Norway 2018 http://dx.doi.org/10.1093/icesjms/fsx233 http://academic.oup.com/icesjms/article-pdf/75/4/1393/31236595/fsx233.pdf en eng Oxford University Press (OUP) https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model ICES Journal of Marine Science volume 75, issue 4, page 1393-1404 ISSN 1054-3139 1095-9289 journal-article 2018 croxfordunivpr https://doi.org/10.1093/icesjms/fsx233 2024-08-12T04:26:02Z Abstract In-trawl camera systems promise to improve the resolution of trawl sampling used to ground-truth the interpretation of acoustic survey data. In this study, the residence time of fish in front of the Deep Vision camera system, used to identify, measure and count fish inside the trawl, was analysed to determine the reliability of spatial distribution recorded by the system. Although Atlantic herring (Clupea harengus), haddock (Melanogrammus aeglefinus), and most Atlantic cod (Gadus morhua) moved quickly back through the aft part of the pelagic trawl, saithe (Pollachius virens) spent up to 4 min in front of the system. The residence time increased for saithe and cod when other individuals were present, and cod swimming in the low water flow close to the trawl netting spent longer there than cod at the centre of the trawl. Surprisingly, residence time was not related to the size of the fish, which may be explained by the collective behaviour of shoaling fish. Our findings suggest that while in-trawl images can be used to identify, measure and count most species, when sampling fast-swimming species such as saithe the position inferred from when they were imaged may not reflect the actual spatial distribution prior to capture. Article in Journal/Newspaper atlantic cod Gadus morhua Oxford University Press ICES Journal of Marine Science 75 4 1393 1404 |
institution |
Open Polar |
collection |
Oxford University Press |
op_collection_id |
croxfordunivpr |
language |
English |
description |
Abstract In-trawl camera systems promise to improve the resolution of trawl sampling used to ground-truth the interpretation of acoustic survey data. In this study, the residence time of fish in front of the Deep Vision camera system, used to identify, measure and count fish inside the trawl, was analysed to determine the reliability of spatial distribution recorded by the system. Although Atlantic herring (Clupea harengus), haddock (Melanogrammus aeglefinus), and most Atlantic cod (Gadus morhua) moved quickly back through the aft part of the pelagic trawl, saithe (Pollachius virens) spent up to 4 min in front of the system. The residence time increased for saithe and cod when other individuals were present, and cod swimming in the low water flow close to the trawl netting spent longer there than cod at the centre of the trawl. Surprisingly, residence time was not related to the size of the fish, which may be explained by the collective behaviour of shoaling fish. Our findings suggest that while in-trawl images can be used to identify, measure and count most species, when sampling fast-swimming species such as saithe the position inferred from when they were imaged may not reflect the actual spatial distribution prior to capture. |
author2 |
O’Neill, Finbarr Research Council of Norway |
format |
Article in Journal/Newspaper |
author |
Underwood, Melanie J Rosen, Shale Engås, Arill Jørgensen, Terje Fernö, Anders |
spellingShingle |
Underwood, Melanie J Rosen, Shale Engås, Arill Jørgensen, Terje Fernö, Anders Species-specific residence times in the aft part of a pelagic survey trawl: implications for inference of pre-capture spatial distribution using the Deep Vision system |
author_facet |
Underwood, Melanie J Rosen, Shale Engås, Arill Jørgensen, Terje Fernö, Anders |
author_sort |
Underwood, Melanie J |
title |
Species-specific residence times in the aft part of a pelagic survey trawl: implications for inference of pre-capture spatial distribution using the Deep Vision system |
title_short |
Species-specific residence times in the aft part of a pelagic survey trawl: implications for inference of pre-capture spatial distribution using the Deep Vision system |
title_full |
Species-specific residence times in the aft part of a pelagic survey trawl: implications for inference of pre-capture spatial distribution using the Deep Vision system |
title_fullStr |
Species-specific residence times in the aft part of a pelagic survey trawl: implications for inference of pre-capture spatial distribution using the Deep Vision system |
title_full_unstemmed |
Species-specific residence times in the aft part of a pelagic survey trawl: implications for inference of pre-capture spatial distribution using the Deep Vision system |
title_sort |
species-specific residence times in the aft part of a pelagic survey trawl: implications for inference of pre-capture spatial distribution using the deep vision system |
publisher |
Oxford University Press (OUP) |
publishDate |
2018 |
url |
http://dx.doi.org/10.1093/icesjms/fsx233 http://academic.oup.com/icesjms/article-pdf/75/4/1393/31236595/fsx233.pdf |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_source |
ICES Journal of Marine Science volume 75, issue 4, page 1393-1404 ISSN 1054-3139 1095-9289 |
op_rights |
https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model |
op_doi |
https://doi.org/10.1093/icesjms/fsx233 |
container_title |
ICES Journal of Marine Science |
container_volume |
75 |
container_issue |
4 |
container_start_page |
1393 |
op_container_end_page |
1404 |
_version_ |
1810431809435992064 |