Historic changes in length distributions of three Baltic cod (Gadus morhua) stocks: Evidence of growth retardation
Understanding how combinations of fishing effort and selectivity affect productivity is central to fisheries research. We investigate the roles of fishing regulation in comparison with ecosystem status for Baltic Sea cod stock productivity, growth performance, and population stability. This case stu...
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ftpubmed:oai:pubmedcentral.nih.gov:5574768 2023-05-15T16:19:18+02:00 Historic changes in length distributions of three Baltic cod (Gadus morhua) stocks: Evidence of growth retardation Svedäng, Henrik Hornborg, Sara 2017-06-28 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5574768/ https://doi.org/10.1002/ece3.3173 en eng John Wiley and Sons Inc. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5574768/ http://dx.doi.org/10.1002/ece3.3173 © 2017 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution (http://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. CC-BY Original Research Text 2017 ftpubmed https://doi.org/10.1002/ece3.3173 2017-09-03T00:30:55Z Understanding how combinations of fishing effort and selectivity affect productivity is central to fisheries research. We investigate the roles of fishing regulation in comparison with ecosystem status for Baltic Sea cod stock productivity, growth performance, and population stability. This case study is interesting because three cod populations with different exploitation patterns and stock status are located in three adjacent but partially, ecologically different areas. In assessing stock status, growth, and productivity, we use survey information and rather basic stock parameters without relying on age readings. Because there is an urgent interest of better understanding of the current development of the Eastern Baltic cod stock, we argue that our approach represents partly a novel way of interpreting monitoring information together with catch data in a simplified yet more informative way. Our study reports how the Eastern and Western Baltic cod have gone toward more truncated size structures between 1991 and 2016, in particular for the Eastern Baltic cod, whereas the Öresund cod show no trend. We suggest that selective fishing may disrupt fish population dynamic stability and that lower natural productivity might amplify the effects of selective fishing. In support of earlier findings on a density‐dependent growth of Eastern Baltic cod, management is advised to acknowledge that sustainable exploitation levels for Eastern Baltic cod are much more limited than perceived in regular assessments. Of more general importance, our results emphasize the need to embrace a more realistic view on what ecosystems can produce regarding tractable fish biomass to facilitate a more ecosystem‐based fisheries management. Text Gadus morhua PubMed Central (PMC) Ecology and Evolution 7 16 6089 6102 |
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Original Research Svedäng, Henrik Hornborg, Sara Historic changes in length distributions of three Baltic cod (Gadus morhua) stocks: Evidence of growth retardation |
topic_facet |
Original Research |
description |
Understanding how combinations of fishing effort and selectivity affect productivity is central to fisheries research. We investigate the roles of fishing regulation in comparison with ecosystem status for Baltic Sea cod stock productivity, growth performance, and population stability. This case study is interesting because three cod populations with different exploitation patterns and stock status are located in three adjacent but partially, ecologically different areas. In assessing stock status, growth, and productivity, we use survey information and rather basic stock parameters without relying on age readings. Because there is an urgent interest of better understanding of the current development of the Eastern Baltic cod stock, we argue that our approach represents partly a novel way of interpreting monitoring information together with catch data in a simplified yet more informative way. Our study reports how the Eastern and Western Baltic cod have gone toward more truncated size structures between 1991 and 2016, in particular for the Eastern Baltic cod, whereas the Öresund cod show no trend. We suggest that selective fishing may disrupt fish population dynamic stability and that lower natural productivity might amplify the effects of selective fishing. In support of earlier findings on a density‐dependent growth of Eastern Baltic cod, management is advised to acknowledge that sustainable exploitation levels for Eastern Baltic cod are much more limited than perceived in regular assessments. Of more general importance, our results emphasize the need to embrace a more realistic view on what ecosystems can produce regarding tractable fish biomass to facilitate a more ecosystem‐based fisheries management. |
format |
Text |
author |
Svedäng, Henrik Hornborg, Sara |
author_facet |
Svedäng, Henrik Hornborg, Sara |
author_sort |
Svedäng, Henrik |
title |
Historic changes in length distributions of three Baltic cod (Gadus morhua) stocks: Evidence of growth retardation |
title_short |
Historic changes in length distributions of three Baltic cod (Gadus morhua) stocks: Evidence of growth retardation |
title_full |
Historic changes in length distributions of three Baltic cod (Gadus morhua) stocks: Evidence of growth retardation |
title_fullStr |
Historic changes in length distributions of three Baltic cod (Gadus morhua) stocks: Evidence of growth retardation |
title_full_unstemmed |
Historic changes in length distributions of three Baltic cod (Gadus morhua) stocks: Evidence of growth retardation |
title_sort |
historic changes in length distributions of three baltic cod (gadus morhua) stocks: evidence of growth retardation |
publisher |
John Wiley and Sons Inc. |
publishDate |
2017 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5574768/ https://doi.org/10.1002/ece3.3173 |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5574768/ http://dx.doi.org/10.1002/ece3.3173 |
op_rights |
© 2017 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution (http://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1002/ece3.3173 |
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Ecology and Evolution |
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7 |
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16 |
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6089 |
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6102 |
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1766005675847057408 |