Historic changes in length distributions of three Baltic cod ( Gadus morhua) stocks: Evidence of growth retardation
Abstract 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...
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crwiley:10.1002/ece3.3173 2024-09-15T18:07:21+00:00 Historic changes in length distributions of three Baltic cod ( Gadus morhua) stocks: Evidence of growth retardation Svedäng, Henrik Hornborg, Sara BONUS INSPIRE and Baltic Sea 2020 2017 http://dx.doi.org/10.1002/ece3.3173 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fece3.3173 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ece3.3173 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Ecology and Evolution volume 7, issue 16, page 6089-6102 ISSN 2045-7758 2045-7758 journal-article 2017 crwiley https://doi.org/10.1002/ece3.3173 2024-06-27T04:21:58Z Abstract 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. Article in Journal/Newspaper Gadus morhua Wiley Online Library Ecology and Evolution 7 16 6089 6102 |
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Wiley Online Library |
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crwiley |
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English |
description |
Abstract 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. |
author2 |
BONUS INSPIRE and Baltic Sea 2020 |
format |
Article in Journal/Newspaper |
author |
Svedäng, Henrik Hornborg, Sara |
spellingShingle |
Svedäng, Henrik Hornborg, Sara Historic changes in length distributions of three Baltic cod ( Gadus morhua) stocks: Evidence of growth retardation |
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 |
Wiley |
publishDate |
2017 |
url |
http://dx.doi.org/10.1002/ece3.3173 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fece3.3173 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ece3.3173 |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_source |
Ecology and Evolution volume 7, issue 16, page 6089-6102 ISSN 2045-7758 2045-7758 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/ece3.3173 |
container_title |
Ecology and Evolution |
container_volume |
7 |
container_issue |
16 |
container_start_page |
6089 |
op_container_end_page |
6102 |
_version_ |
1810444733086957568 |