Including older fish in fisheries management: A new age‐based indicator and reference point for exploited fish stocks
Abstract Larger and older fish contribute disproportionately to spawning and play an important role in the replenishment of exploited stocks. Fishing often removes specific size‐ and age‐classes, with direct impacts on stock productivity and population resilience. Despite this, fisheries advice is c...
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Online Access: | http://dx.doi.org/10.1111/faf.12789 https://onlinelibrary.wiley.com/doi/pdf/10.1111/faf.12789 |
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crwiley:10.1111/faf.12789 2024-06-23T07:55:28+00:00 Including older fish in fisheries management: A new age‐based indicator and reference point for exploited fish stocks Griffiths, Christopher A. Winker, Henning Bartolino, Valerio Wennhage, Håkan Orio, Alessandro Cardinale, Massimiliano 2023 http://dx.doi.org/10.1111/faf.12789 https://onlinelibrary.wiley.com/doi/pdf/10.1111/faf.12789 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Fish and Fisheries volume 25, issue 1, page 18-37 ISSN 1467-2960 1467-2979 journal-article 2023 crwiley https://doi.org/10.1111/faf.12789 2024-06-11T04:38:49Z Abstract Larger and older fish contribute disproportionately to spawning and play an important role in the replenishment of exploited stocks. Fishing often removes specific size‐ and age‐classes, with direct impacts on stock productivity and population resilience. Despite this, fisheries advice is commonly based on estimates of spawning stock biomass (SSB) and fishing mortality (F) and makes little reference to the importance of size and/or age structure. Consequently, there is a need for indicators of size and/or age structure to better inform fisheries management and help assess global sustainability goals. Here, we introduce a new age‐based indicator ABI MSY that monitors age structure relative to the equilibrium age structure at F MSY . We apply this new indicator to 72 commercially important stocks in the Northeast Atlantic, covering 26 species, which collectively contributed 86% of all commercial catches in the region in 2019. We estimate that 62% (45 stocks) currently have proportionally fewer older fish relative to F MSY conditions, whereas 38% (27 stocks) have proportionally more older fish; we also note patterns with respect to geographic area and taxonomic family. Simulation testing demonstrated that ABI MSY is responsive to overfishing and generally tracks (with high sensitivity and specificity) a common measure of stock depletion, SSB relative to B MSY . Throughout, we show that ABI MSY provides information on the age structure of exploited stocks that is complementary to conventional reference points for SSB and F . Further, the framework used to estimate ABI MSY make it well placed for integration into current advisory frameworks on fisheries management. Article in Journal/Newspaper Northeast Atlantic Wiley Online Library Fish and Fisheries 25 1 18 37 |
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Abstract Larger and older fish contribute disproportionately to spawning and play an important role in the replenishment of exploited stocks. Fishing often removes specific size‐ and age‐classes, with direct impacts on stock productivity and population resilience. Despite this, fisheries advice is commonly based on estimates of spawning stock biomass (SSB) and fishing mortality (F) and makes little reference to the importance of size and/or age structure. Consequently, there is a need for indicators of size and/or age structure to better inform fisheries management and help assess global sustainability goals. Here, we introduce a new age‐based indicator ABI MSY that monitors age structure relative to the equilibrium age structure at F MSY . We apply this new indicator to 72 commercially important stocks in the Northeast Atlantic, covering 26 species, which collectively contributed 86% of all commercial catches in the region in 2019. We estimate that 62% (45 stocks) currently have proportionally fewer older fish relative to F MSY conditions, whereas 38% (27 stocks) have proportionally more older fish; we also note patterns with respect to geographic area and taxonomic family. Simulation testing demonstrated that ABI MSY is responsive to overfishing and generally tracks (with high sensitivity and specificity) a common measure of stock depletion, SSB relative to B MSY . Throughout, we show that ABI MSY provides information on the age structure of exploited stocks that is complementary to conventional reference points for SSB and F . Further, the framework used to estimate ABI MSY make it well placed for integration into current advisory frameworks on fisheries management. |
format |
Article in Journal/Newspaper |
author |
Griffiths, Christopher A. Winker, Henning Bartolino, Valerio Wennhage, Håkan Orio, Alessandro Cardinale, Massimiliano |
spellingShingle |
Griffiths, Christopher A. Winker, Henning Bartolino, Valerio Wennhage, Håkan Orio, Alessandro Cardinale, Massimiliano Including older fish in fisheries management: A new age‐based indicator and reference point for exploited fish stocks |
author_facet |
Griffiths, Christopher A. Winker, Henning Bartolino, Valerio Wennhage, Håkan Orio, Alessandro Cardinale, Massimiliano |
author_sort |
Griffiths, Christopher A. |
title |
Including older fish in fisheries management: A new age‐based indicator and reference point for exploited fish stocks |
title_short |
Including older fish in fisheries management: A new age‐based indicator and reference point for exploited fish stocks |
title_full |
Including older fish in fisheries management: A new age‐based indicator and reference point for exploited fish stocks |
title_fullStr |
Including older fish in fisheries management: A new age‐based indicator and reference point for exploited fish stocks |
title_full_unstemmed |
Including older fish in fisheries management: A new age‐based indicator and reference point for exploited fish stocks |
title_sort |
including older fish in fisheries management: a new age‐based indicator and reference point for exploited fish stocks |
publisher |
Wiley |
publishDate |
2023 |
url |
http://dx.doi.org/10.1111/faf.12789 https://onlinelibrary.wiley.com/doi/pdf/10.1111/faf.12789 |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_source |
Fish and Fisheries volume 25, issue 1, page 18-37 ISSN 1467-2960 1467-2979 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1111/faf.12789 |
container_title |
Fish and Fisheries |
container_volume |
25 |
container_issue |
1 |
container_start_page |
18 |
op_container_end_page |
37 |
_version_ |
1802648088977866752 |