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Year-round genetic monitoring of mixed-stock fishery of Atlantic cod (Gadus morhua); implications for management.
- Source :
-
ICES Journal of Marine Science / Journal du Conseil . Jul2022, Vol. 79 Issue 5, p1515-1529. 15p. - Publication Year :
- 2022
-
Abstract
- 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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10543139
- Volume :
- 79
- Issue :
- 5
- Database :
- Academic Search Index
- Journal :
- ICES Journal of Marine Science / Journal du Conseil
- Publication Type :
- Academic Journal
- Accession number :
- 157707941
- Full Text :
- https://doi.org/10.1093/icesjms/fsac076