Implications of late-in-life density-dependent growth for fishery size-at-entry leading to maximum sustainable yield
Abstract Currently applied fisheries models and stock assessments rely on the assumption that density-dependent regulation only affects processes early in life, as described by stock–recruitment relationships. However, many fish stocks also experience density-dependent processes late in life, such a...
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Oxford University Press (OUP)
2018
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Online Access: | http://dx.doi.org/10.1093/icesjms/fsx236 http://academic.oup.com/icesjms/article-pdf/75/4/1296/31236411/fsx236.pdf |
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croxfordunivpr:10.1093/icesjms/fsx236 2024-09-15T18:25:25+00:00 Implications of late-in-life density-dependent growth for fishery size-at-entry leading to maximum sustainable yield van Gemert, Rob Andersen, Ken H Kuparinen, Anna Villum Foundation European Union’s Horizon 2020 research and innovation programme Marie Skłodowska-Curie 2018 http://dx.doi.org/10.1093/icesjms/fsx236 http://academic.oup.com/icesjms/article-pdf/75/4/1296/31236411/fsx236.pdf en eng Oxford University Press (OUP) http://creativecommons.org/licenses/by/4.0/ ICES Journal of Marine Science volume 75, issue 4, page 1296-1305 ISSN 1054-3139 1095-9289 journal-article 2018 croxfordunivpr https://doi.org/10.1093/icesjms/fsx236 2024-08-12T04:24:31Z Abstract Currently applied fisheries models and stock assessments rely on the assumption that density-dependent regulation only affects processes early in life, as described by stock–recruitment relationships. However, many fish stocks also experience density-dependent processes late in life, such as density-dependent adult growth. Theoretical studies have found that, for stocks which experience strong late-in-life density dependence, maximum sustainable yield (MSY) is obtained with a small fishery size-at-entry that also targets juveniles. This goes against common fisheries advice, which dictates that primarily adults should be fished. This study aims to examine whether the strength of density-dependent growth in actual fish stocks is sufficiently strong to reduce optimal fishery size-at-entry to below size-at-maturity. A size-structured model is fitted to three stocks that have shown indications of late-in-life density-dependent growth: North Sea plaice (Pleuronectes platessa), Northeast Atlantic (NEA) mackerel (Scomber scombrus), and Baltic sprat (Sprattus sprattus balticus). For all stocks, the model predicts exploitation at MSY with a large size-at-entry into the fishery, indicating that late-in-life density dependence in fish stocks is generally not strong enough to warrant the targeting of juveniles. This result lends credibility to the practise of predominantly targeting adults in spite of the presence of late-in-life density-dependent growth. Article in Journal/Newspaper Northeast Atlantic Oxford University Press ICES Journal of Marine Science 75 4 1296 1305 |
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Oxford University Press |
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English |
description |
Abstract Currently applied fisheries models and stock assessments rely on the assumption that density-dependent regulation only affects processes early in life, as described by stock–recruitment relationships. However, many fish stocks also experience density-dependent processes late in life, such as density-dependent adult growth. Theoretical studies have found that, for stocks which experience strong late-in-life density dependence, maximum sustainable yield (MSY) is obtained with a small fishery size-at-entry that also targets juveniles. This goes against common fisheries advice, which dictates that primarily adults should be fished. This study aims to examine whether the strength of density-dependent growth in actual fish stocks is sufficiently strong to reduce optimal fishery size-at-entry to below size-at-maturity. A size-structured model is fitted to three stocks that have shown indications of late-in-life density-dependent growth: North Sea plaice (Pleuronectes platessa), Northeast Atlantic (NEA) mackerel (Scomber scombrus), and Baltic sprat (Sprattus sprattus balticus). For all stocks, the model predicts exploitation at MSY with a large size-at-entry into the fishery, indicating that late-in-life density dependence in fish stocks is generally not strong enough to warrant the targeting of juveniles. This result lends credibility to the practise of predominantly targeting adults in spite of the presence of late-in-life density-dependent growth. |
author2 |
Kuparinen, Anna Villum Foundation European Union’s Horizon 2020 research and innovation programme Marie Skłodowska-Curie |
format |
Article in Journal/Newspaper |
author |
van Gemert, Rob Andersen, Ken H |
spellingShingle |
van Gemert, Rob Andersen, Ken H Implications of late-in-life density-dependent growth for fishery size-at-entry leading to maximum sustainable yield |
author_facet |
van Gemert, Rob Andersen, Ken H |
author_sort |
van Gemert, Rob |
title |
Implications of late-in-life density-dependent growth for fishery size-at-entry leading to maximum sustainable yield |
title_short |
Implications of late-in-life density-dependent growth for fishery size-at-entry leading to maximum sustainable yield |
title_full |
Implications of late-in-life density-dependent growth for fishery size-at-entry leading to maximum sustainable yield |
title_fullStr |
Implications of late-in-life density-dependent growth for fishery size-at-entry leading to maximum sustainable yield |
title_full_unstemmed |
Implications of late-in-life density-dependent growth for fishery size-at-entry leading to maximum sustainable yield |
title_sort |
implications of late-in-life density-dependent growth for fishery size-at-entry leading to maximum sustainable yield |
publisher |
Oxford University Press (OUP) |
publishDate |
2018 |
url |
http://dx.doi.org/10.1093/icesjms/fsx236 http://academic.oup.com/icesjms/article-pdf/75/4/1296/31236411/fsx236.pdf |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_source |
ICES Journal of Marine Science volume 75, issue 4, page 1296-1305 ISSN 1054-3139 1095-9289 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1093/icesjms/fsx236 |
container_title |
ICES Journal of Marine Science |
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75 |
container_issue |
4 |
container_start_page |
1296 |
op_container_end_page |
1305 |
_version_ |
1810465930901192704 |