Year-round genetic monitoring of mixed-stock fishery of Atlantic cod ( Gadus morhua ); implications for management

Mixed-stock fisheries pose a challenge for fisheries management recommendations and management, as mixed stocks can lead to unintentional over- or under-exploitation of stocks, with both short- and long-term biological and economic consequences. This study demonstrates practical application and impl...

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Published in:ICES Journal of Marine Science
Main Authors: Christensen, Helle Torp, Riget, Frank, Retzel, Anja, Nielsen, Erik Haar, Nielsen, Einar Eg, Hedeholm, Rasmus Berg
Format: Article in Journal/Newspaper
Language:English
Published: 2022
Subjects:
DNA
Online Access:https://pure.au.dk/portal/da/publications/yearround-genetic-monitoring-of-mixedstock-fishery-of-atlantic-cod-gadus-morhua-implications-for-management(9a3292ec-8925-45f8-8f15-5fb05561ede6).html
https://doi.org/10.1093/icesjms/fsac076
id ftuniaarhuspubl:oai:pure.atira.dk:publications/9a3292ec-8925-45f8-8f15-5fb05561ede6
record_format openpolar
spelling ftuniaarhuspubl:oai:pure.atira.dk:publications/9a3292ec-8925-45f8-8f15-5fb05561ede6 2023-08-27T04:08:25+02:00 Year-round genetic monitoring of mixed-stock fishery of Atlantic cod ( Gadus morhua ); implications for management Christensen, Helle Torp Riget, Frank Retzel, Anja Nielsen, Erik Haar Nielsen, Einar Eg Hedeholm, Rasmus Berg 2022-07 https://pure.au.dk/portal/da/publications/yearround-genetic-monitoring-of-mixedstock-fishery-of-atlantic-cod-gadus-morhua-implications-for-management(9a3292ec-8925-45f8-8f15-5fb05561ede6).html https://doi.org/10.1093/icesjms/fsac076 eng eng info:eu-repo/semantics/restrictedAccess Christensen , H T , Riget , F , Retzel , A , Nielsen , E H , Nielsen , E E & Hedeholm , R B 2022 , ' Year-round genetic monitoring of mixed-stock fishery of Atlantic cod ( Gadus morhua ); implications for management ' , ICES Journal of Marine Science , vol. 79 , no. 5 , pp. 1515-1529 . https://doi.org/10.1093/icesjms/fsac076 DNA fisheries management fishery migration mixed stocks GREENLAND WATERS POPULATION MARINE DISCRIMINATION DIVERSITY MOVEMENTS DYNAMICS GROWTH LIFE MARKERS article 2022 ftuniaarhuspubl https://doi.org/10.1093/icesjms/fsac076 2023-08-02T22:58:18Z Mixed-stock fisheries pose a challenge for fisheries management recommendations and management, as mixed stocks can lead to unintentional over- or under-exploitation of stocks, with both short- and long-term biological and economic consequences. This study demonstrates practical application and implementation of year-round high-resolution genetic stock monitoring in management of mixed Atlantic cod (Gadus morhua) stocks in western Greenland. Using a panel of 96 high resolution gene-associated SNPs, we identified the stock of origin for four cod stocks in the two major inshore mixed-stock fisheries. Contribution of individual stocks was quantified to identify if fjord sections, times of year, and fish size, would allow a "clean fishery" with a minimal contribution of the depleted West Greenland Offshore (WGO) population. High level of mixing was identified with 50% of inshore catches originating from the inshore stock, 20% from the East Greenland/Iceland offshore stock, and 30% from the WGO stock. Although some spatiotemporal variation of stock proportions was identified, a practice allowing exclusively fishing a specific stock was not possible. Accordingly, we demonstrate the need to allocate catches at the biological stock level and show that application of high-resolution genetics is a reliable and necessary tool. Article in Journal/Newspaper atlantic cod East Greenland Gadus morhua Greenland Iceland Aarhus University: Research Greenland ICES Journal of Marine Science 79 5 1515 1529
institution Open Polar
collection Aarhus University: Research
op_collection_id ftuniaarhuspubl
language English
topic DNA
fisheries management
fishery
migration
mixed stocks
GREENLAND WATERS
POPULATION
MARINE
DISCRIMINATION
DIVERSITY
MOVEMENTS
DYNAMICS
GROWTH
LIFE
MARKERS
spellingShingle DNA
fisheries management
fishery
migration
mixed stocks
GREENLAND WATERS
POPULATION
MARINE
DISCRIMINATION
DIVERSITY
MOVEMENTS
DYNAMICS
GROWTH
LIFE
MARKERS
Christensen, Helle Torp
Riget, Frank
Retzel, Anja
Nielsen, Erik Haar
Nielsen, Einar Eg
Hedeholm, Rasmus Berg
Year-round genetic monitoring of mixed-stock fishery of Atlantic cod ( Gadus morhua ); implications for management
topic_facet DNA
fisheries management
fishery
migration
mixed stocks
GREENLAND WATERS
POPULATION
MARINE
DISCRIMINATION
DIVERSITY
MOVEMENTS
DYNAMICS
GROWTH
LIFE
MARKERS
description Mixed-stock fisheries pose a challenge for fisheries management recommendations and management, as mixed stocks can lead to unintentional over- or under-exploitation of stocks, with both short- and long-term biological and economic consequences. This study demonstrates practical application and implementation of year-round high-resolution genetic stock monitoring in management of mixed Atlantic cod (Gadus morhua) stocks in western Greenland. Using a panel of 96 high resolution gene-associated SNPs, we identified the stock of origin for four cod stocks in the two major inshore mixed-stock fisheries. Contribution of individual stocks was quantified to identify if fjord sections, times of year, and fish size, would allow a "clean fishery" with a minimal contribution of the depleted West Greenland Offshore (WGO) population. High level of mixing was identified with 50% of inshore catches originating from the inshore stock, 20% from the East Greenland/Iceland offshore stock, and 30% from the WGO stock. Although some spatiotemporal variation of stock proportions was identified, a practice allowing exclusively fishing a specific stock was not possible. Accordingly, we demonstrate the need to allocate catches at the biological stock level and show that application of high-resolution genetics is a reliable and necessary tool.
format Article in Journal/Newspaper
author Christensen, Helle Torp
Riget, Frank
Retzel, Anja
Nielsen, Erik Haar
Nielsen, Einar Eg
Hedeholm, Rasmus Berg
author_facet Christensen, Helle Torp
Riget, Frank
Retzel, Anja
Nielsen, Erik Haar
Nielsen, Einar Eg
Hedeholm, Rasmus Berg
author_sort Christensen, Helle Torp
title Year-round genetic monitoring of mixed-stock fishery of Atlantic cod ( Gadus morhua ); implications for management
title_short Year-round genetic monitoring of mixed-stock fishery of Atlantic cod ( Gadus morhua ); implications for management
title_full Year-round genetic monitoring of mixed-stock fishery of Atlantic cod ( Gadus morhua ); implications for management
title_fullStr Year-round genetic monitoring of mixed-stock fishery of Atlantic cod ( Gadus morhua ); implications for management
title_full_unstemmed Year-round genetic monitoring of mixed-stock fishery of Atlantic cod ( Gadus morhua ); implications for management
title_sort year-round genetic monitoring of mixed-stock fishery of atlantic cod ( gadus morhua ); implications for management
publishDate 2022
url https://pure.au.dk/portal/da/publications/yearround-genetic-monitoring-of-mixedstock-fishery-of-atlantic-cod-gadus-morhua-implications-for-management(9a3292ec-8925-45f8-8f15-5fb05561ede6).html
https://doi.org/10.1093/icesjms/fsac076
geographic Greenland
geographic_facet Greenland
genre atlantic cod
East Greenland
Gadus morhua
Greenland
Iceland
genre_facet atlantic cod
East Greenland
Gadus morhua
Greenland
Iceland
op_source Christensen , H T , Riget , F , Retzel , A , Nielsen , E H , Nielsen , E E & Hedeholm , R B 2022 , ' Year-round genetic monitoring of mixed-stock fishery of Atlantic cod ( Gadus morhua ); implications for management ' , ICES Journal of Marine Science , vol. 79 , no. 5 , pp. 1515-1529 . https://doi.org/10.1093/icesjms/fsac076
op_rights info:eu-repo/semantics/restrictedAccess
op_doi https://doi.org/10.1093/icesjms/fsac076
container_title ICES Journal of Marine Science
container_volume 79
container_issue 5
container_start_page 1515
op_container_end_page 1529
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