Bias in size composition of chum salmon (Oncorhynchus keta) caught by a gillnet with a geometric series of mesh sizes, and its correction using gear intercalibration
Abstract Fukuwaka, M., Azumaya, T., Davis, N. D., and Nagasawa, T. 2008. Bias in size composition of chum salmon (Oncorhynchus keta) caught by a gillnet with a geometric series of mesh sizes, and its correction using gear intercalibration. – ICES Journal of Marine Science, 65: 930–936. Some research...
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Online Access: | http://dx.doi.org/10.1093/icesjms/fsn076 http://academic.oup.com/icesjms/article-pdf/65/6/930/29130732/fsn076.pdf |
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croxfordunivpr:10.1093/icesjms/fsn076 2023-12-31T10:05:22+01:00 Bias in size composition of chum salmon (Oncorhynchus keta) caught by a gillnet with a geometric series of mesh sizes, and its correction using gear intercalibration Fukuwaka, Masa-aki Azumaya, Tomonori Davis, Nancy D. Nagasawa, Toru 2008 http://dx.doi.org/10.1093/icesjms/fsn076 http://academic.oup.com/icesjms/article-pdf/65/6/930/29130732/fsn076.pdf en eng Oxford University Press (OUP) ICES Journal of Marine Science volume 65, issue 6, page 930-936 ISSN 1095-9289 1054-3139 Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2008 croxfordunivpr https://doi.org/10.1093/icesjms/fsn076 2023-12-06T08:48:38Z Abstract Fukuwaka, M., Azumaya, T., Davis, N. D., and Nagasawa, T. 2008. Bias in size composition of chum salmon (Oncorhynchus keta) caught by a gillnet with a geometric series of mesh sizes, and its correction using gear intercalibration. – ICES Journal of Marine Science, 65: 930–936. Some research gillnets with size combinations based on a geometric series have been used for research surveys underpinning the stock assessment of fresh-water and marine fish. We assessed a bias in size composition of chum salmon caught using a research gillnet consisting of ten different mesh sizes based on a geometric series of factor 1.14. In all, 11 fishing operations were conducted for gear intercalibration between the research gillnet and a midwater trawl in the central Bering Sea. The best-fit selectivity model to pooled catch data included different fishing intensities among gillnet meshes. The pooled catch efficiency and the maximum catch efficiency of the gillnet increased with fish size. Estimated size composition of chum salmon was more similar to trawl catches than to research gillnet catches. Bias in size composition of research gillnet catches may be caused by the difference in encounter probability among mesh sizes, variability in fish swimming speed based on fish size, mesh visibility influencing fish behaviour, and diel vertical migration of chum salmon. When conducting multimesh gillnet surveys for stock assessment, researchers should correct a bias in size composition by performing gear intercalibrations. Article in Journal/Newspaper Bering Sea Oxford University Press (via Crossref) ICES Journal of Marine Science 65 6 930 936 |
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Open Polar |
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Oxford University Press (via Crossref) |
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croxfordunivpr |
language |
English |
topic |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography Fukuwaka, Masa-aki Azumaya, Tomonori Davis, Nancy D. Nagasawa, Toru Bias in size composition of chum salmon (Oncorhynchus keta) caught by a gillnet with a geometric series of mesh sizes, and its correction using gear intercalibration |
topic_facet |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract Fukuwaka, M., Azumaya, T., Davis, N. D., and Nagasawa, T. 2008. Bias in size composition of chum salmon (Oncorhynchus keta) caught by a gillnet with a geometric series of mesh sizes, and its correction using gear intercalibration. – ICES Journal of Marine Science, 65: 930–936. Some research gillnets with size combinations based on a geometric series have been used for research surveys underpinning the stock assessment of fresh-water and marine fish. We assessed a bias in size composition of chum salmon caught using a research gillnet consisting of ten different mesh sizes based on a geometric series of factor 1.14. In all, 11 fishing operations were conducted for gear intercalibration between the research gillnet and a midwater trawl in the central Bering Sea. The best-fit selectivity model to pooled catch data included different fishing intensities among gillnet meshes. The pooled catch efficiency and the maximum catch efficiency of the gillnet increased with fish size. Estimated size composition of chum salmon was more similar to trawl catches than to research gillnet catches. Bias in size composition of research gillnet catches may be caused by the difference in encounter probability among mesh sizes, variability in fish swimming speed based on fish size, mesh visibility influencing fish behaviour, and diel vertical migration of chum salmon. When conducting multimesh gillnet surveys for stock assessment, researchers should correct a bias in size composition by performing gear intercalibrations. |
format |
Article in Journal/Newspaper |
author |
Fukuwaka, Masa-aki Azumaya, Tomonori Davis, Nancy D. Nagasawa, Toru |
author_facet |
Fukuwaka, Masa-aki Azumaya, Tomonori Davis, Nancy D. Nagasawa, Toru |
author_sort |
Fukuwaka, Masa-aki |
title |
Bias in size composition of chum salmon (Oncorhynchus keta) caught by a gillnet with a geometric series of mesh sizes, and its correction using gear intercalibration |
title_short |
Bias in size composition of chum salmon (Oncorhynchus keta) caught by a gillnet with a geometric series of mesh sizes, and its correction using gear intercalibration |
title_full |
Bias in size composition of chum salmon (Oncorhynchus keta) caught by a gillnet with a geometric series of mesh sizes, and its correction using gear intercalibration |
title_fullStr |
Bias in size composition of chum salmon (Oncorhynchus keta) caught by a gillnet with a geometric series of mesh sizes, and its correction using gear intercalibration |
title_full_unstemmed |
Bias in size composition of chum salmon (Oncorhynchus keta) caught by a gillnet with a geometric series of mesh sizes, and its correction using gear intercalibration |
title_sort |
bias in size composition of chum salmon (oncorhynchus keta) caught by a gillnet with a geometric series of mesh sizes, and its correction using gear intercalibration |
publisher |
Oxford University Press (OUP) |
publishDate |
2008 |
url |
http://dx.doi.org/10.1093/icesjms/fsn076 http://academic.oup.com/icesjms/article-pdf/65/6/930/29130732/fsn076.pdf |
genre |
Bering Sea |
genre_facet |
Bering Sea |
op_source |
ICES Journal of Marine Science volume 65, issue 6, page 930-936 ISSN 1095-9289 1054-3139 |
op_doi |
https://doi.org/10.1093/icesjms/fsn076 |
container_title |
ICES Journal of Marine Science |
container_volume |
65 |
container_issue |
6 |
container_start_page |
930 |
op_container_end_page |
936 |
_version_ |
1786836956688154624 |