Assessment of genetic structure among Australian east coast populations of snapper Chrysophrys auratus (Sparidae)
Jess A. T. Morgan
A F , Wayne D. Sumpton A , Andrew T. Jones B , Alexander B. Campbell A , John Stewart C , Paul Hamer D and Jennifer R. Ovenden E
+ Author Affiliations
- Author Affiliations
A Animal Science, Department of Agriculture and Fisheries, EcoSciences Precinct, Boggo Road, Dutton Park, Qld 4102, Australia.
B Department of Mathematics, The University of Queensland, Saint Lucia, Qld 4072, Australia.
C New South Wales Department of Primary Industries, Sydney Institute of Marine Science, Chowder Bay Road, Mosman, NSW 2088, Australia.
D Victorian Fisheries Authority, Department of Economic Development Jobs Transport and Resources, Bellarine Highway, Queenscliff, Vic. 3225, Australia.
E Molecular Fisheries Laboratory, School of Biomedical Sciences, The University of Queensland, Saint Lucia, Qld 4072, Australia.
F Corresponding author. Email: jessica.morgan@daf.qld.gov.au
Marine and Freshwater Research 70(7) 964-976 https://doi.org/10.1071/MF18146
Submitted: 4 April 2018 Accepted: 1 November 2018 Published: 19 December 2018
Journal Compilation © CSIRO 2019 Open Access CC BY-NC-ND
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
Additional keywords: effective population size, fisheries management, microsatellite genotyping, stock structure.
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