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
<qd> 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. </qd&g...
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fthighwire:oai:open-archive.highwire.org:icesjms:65/6/930 2023-05-15T15:43:53+02:00 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 2008-09-01 00:00:00.0 text/html http://icesjms.oxfordjournals.org/cgi/content/short/65/6/930 https://doi.org/10.1093/icesjms/fsn076 en eng Oxford University Press http://icesjms.oxfordjournals.org/cgi/content/short/65/6/930 http://dx.doi.org/10.1093/icesjms/fsn076 Copyright (C) 2008, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer Articles TEXT 2008 fthighwire https://doi.org/10.1093/icesjms/fsn076 2008-07-22T06:17:23Z <qd> 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. </qd>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. Text Bering Sea HighWire Press (Stanford University) Bering Sea Keta ENVELOPE(-19.455,-19.455,65.656,65.656) ICES Journal of Marine Science 65 6 930 936 |
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Articles 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 |
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<qd> 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. </qd>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 |
Text |
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 |
publishDate |
2008 |
url |
http://icesjms.oxfordjournals.org/cgi/content/short/65/6/930 https://doi.org/10.1093/icesjms/fsn076 |
long_lat |
ENVELOPE(-19.455,-19.455,65.656,65.656) |
geographic |
Bering Sea Keta |
geographic_facet |
Bering Sea Keta |
genre |
Bering Sea |
genre_facet |
Bering Sea |
op_relation |
http://icesjms.oxfordjournals.org/cgi/content/short/65/6/930 http://dx.doi.org/10.1093/icesjms/fsn076 |
op_rights |
Copyright (C) 2008, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer |
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 |
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1766378089974071296 |