Genomic analysis reveals multiple mismatches between biological and management units in yellowfin tuna (Thunnus albacares)
Open accessAbstract
The South African (SAF) yellowfin tuna (Thunnus albacares) fishery represents a potential example of misalignment between management units and biological processes. The SAF fishery spans an operational stock with a boundary at 20°E, either side of which fish are considered part of Atlantic or Indian Ocean regional stocks. However, the actual recruitment of fish from Atlantic and Indian Ocean spawning populations into SAF waters is unknown. To address this knowledge gap, genomic analysis (11 101 SNPs) was performed on samples from Atlantic and Indian Ocean spawning sites, including SAF sites spanning the current stock boundary. Outlier loci conferred high discriminatory power to assignment tests and revealed that all SAF fish were assigned to the Indian Ocean population and that no Atlantic Ocean fish appeared in the SAF samples. Additionally, several Indian Ocean migrants were detected at the Atlantic spawning site demonstrating asymmetric dispersal and the occurrence of a mixed-stock fishery in Atlantic waters. This study highlights both the spatial inaccuracy of current stock designations and a misunderstanding of interactions between the underlying biological units, which must be addressed in light of local and global declines of the species. Specifically, the entire SAF fishery must be managed as part of the Indian Ocean stock.
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Genomic analyses have revealed asymmetrical dispersal from the Indian Ocean yellowfin tuna into the Atlantic and highlighted that yellowfin tuna found along all the South African coast are derived from the Indian population.
“Moreover, genomic analyses have revealed asymmetrical dispersal from the Indian Ocean yellowfin tuna into the Atlantic and highlighted that yellowfin tuna found along all the South African coast are derived from the Indian population (Barth et al., 2017; Mullins et al., 2018).”
From A review of the fisheries, life history and stock structure of tropical tuna (skipjack Katsuwonus pelamis, yellowfin Thunnus albacares and bigeye Thunnus obesus) in the Indian Ocean (2021) · cites this paper as Mullins et al., 2018
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Barth, J. M. I., Damerau, M., Matschiner, M., Jentoft, S., & Hanel, R. (2017) · Genome Biology and Evolution · doi:10.1093/gbe/evx067 · Cited by 62 · cited 2× · see citing works
“Recent genomic studies have confirmed genetic differences and restricted interbreeding among regional groups (Pecoraro et al., 2016; Barth et al., 2017).”
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Cited by
Sorted by citations
- Authors
- Mullins, R. B., McKeown, N. J., Sauer, W. H. H., & Shaw, P. W.
- Affiliations
- Rhodes University (ZA)
- Aberystwyth University (GB)
- Department of Ichthyology & Fisheries Science, Rhodes University, Grahamstown, South Africa
- Corresponding author
- McKeown, Niall J
- Venue
- ICES Journal of Marine Science
- Publisher
- Oxford University Press (OUP)
- Published
- 2018-07-31
- Volume
- 75
- Issue
- 6
- Pages
- 2145-2152
- ISSN
- 1054-3139 (ISSN-L)
- 1095-9289
- OpenAlex
- W2885466438
- Cited by
- 46
- References
- 1
- Citations by year
- 2026: 1 · 2025: 5 · 2024: 2 · 2023: 8 · 2022: 8 · 2021: 8 · 2020: 12 · 2019: 2
- FWCI
- 3.37
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- ICES Journal of Marine Science (publishedVersion, cc-by)
- Funders
- BBSRC
- Marine Stewardship Council
- National Research Foundation
- Belmont Forum
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic diversity and population structure
- Physical Sciences › Environmental Science › Global and Planetary Change › Marine and fisheries research
- Physical Sciences › Environmental Science › Nature and Landscape Conservation › Fish Ecology and Management Studies
- Keywords
- yellowfin tuna, management units, asymmetric dispersal, mixed-stock fisheries, population assignment, outlier loci, fisheries management
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