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Assessment of genetic structure among Australian east coast populations of snapper Chrysophrys auratus (Sparidae)

Morgan, J. A. T., Sumpton, W. D., Jones, A. T., Campbell, A. B., Stewart, J., Hamer, P. and Ovenden, J. R. (2019) Assessment of genetic structure among Australian east coast populations of snapper Chrysophrys auratus (Sparidae). Marine and Freshwater Research, 70 . pp. 964-976.

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Article Link(s): https://doi.org/10.1071/MF18146

Publisher URL: http://www.publish.csiro.au/mf/pdf/MF18146

Abstract

Snapper Chrysophrys auratus is a high-value food fish in Australia targeted by both commercial and recreational fisheries. Along the east coast of Australia, fisheries are managed under four state jurisdictions (Queensland, Qld; New South Wales, NSW; Victoria, Vic.; and Tasmania, Tas.), each applying different regulations, although it is thought that the fisheries target the same biological stock. An allozyme-based study in the mid-1990s identified a weak genetic disjunction north of Sydney (NSW) questioning the single-stock hypothesis. This study, focused on east-coast C. auratus, used nine microsatellite markers to assess the validity of the allozyme break and investigated whether genetic structure exists further south. Nine locations were sampled spanning four states and over 2000 km, including sites north and south of the proposed allozyme disjunction. Analyses confirmed the presence of two distinct biological stocks along the east coast, with a region of genetic overlap around Eden in southern NSW, ~400 km south of the allozyme disjunction. The findings indicate that C. auratus off Vic. and Tas. are distinct from those in Qld and NSW. For the purpose of stock assessment and management, the results indicate that Qld and NSW fisheries are targeting a single biological stock.A

Item Type:Article
Business groups:Animal Science
Additional Information:This paper is copyright of The State of Queensland (through the Department Agriculture and Fisheries). Journal Compilation CSIRO 2019 Open Access CC BY-NC-ND
Keywords:effective population size, fisheries management, microsatellite genotyping, stock structure.
Subjects:Science > Biology > Genetics
Aquaculture and Fisheries > Fisheries > Fishery management. Fishery policy
Aquaculture and Fisheries > Fisheries > Fishery research
Deposited On:06 Mar 2019 00:44
Last Modified:13 Jun 2019 03:09

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