Tagging studies reveal restricted movement of snapper (Pagrus auratus) within Shark Bay, supporting fine-scale fisheries management
Jeffrey V. Norriss A B , Michael Moran A and Gary Jackson A
+ Author Affiliations
- Author Affiliations
A Western Australian Fisheries and Marine Research Laboratory, Department of Fisheries, Government of Western Australia, PO Box 20, North Beach, WA 6920, Australia.
B Corresponding author. Email: Jeffrey.Norriss@fish.wa.gov.au
Marine and Freshwater Research 63(11) 1191-1199 https://doi.org/10.1071/MF12077
Submitted: 13 March 2012 Accepted: 21 August 2012 Published: 26 November 2012
Abstract
The snapper (Pagrus auratus) fisheries of Shark Bay’s complex inner gulfs are managed on a fine spatial scale (tens of kilometres). Following the splitting of the Western Gulf into two management zones, results from an earlier 1980s tagging study were revisited to assess the suitability of management arrangements. Recaptures up to 15 years at liberty showed highly restricted movement, with 300 of 491 occurring within 5 nautical miles of the tagging site and only 3.3% crossing the new zone boundary. A simple stock-trajectory model simulating the two Western Gulf populations demonstrated a negligible impact from a 1% per annum level of mixing. The 1980s study was repeated between 1998 and 2003 by tagging 2558 snapper, mainly in areas previously under-represented. Recaptures up to 2 years at liberty again showed highly restricted movement, with 181 of 197 recaptures occurring at the tagging site. Juveniles were more sedentary than adults, the latter showing limited evidence of inter-annual spawning-site fidelity. Together, both studies support the use of three small management zones. Community acceptance of these complex arrangements was aided by collaborating with volunteers on research programs, which improved their understanding of the population structure.
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