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ICES Journal of Marine Science: Journal du Conseil 2004 61(7):1137-1143; doi:10.1016/j.icesjms.2004.07.004
© 2004 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
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Ultrasonic tracking reveals multiple behavioural modes of snapper (Pagrus auratus) in a temperate no-take marine reserve

D.P. Eglia,* and R.C. Babcockb

a Leigh Marine Laboratory, University of Auckland PO Box 349, Warkworth, New Zealand
b CSIRO Marine Research Private Bag No. 5, Wembley 6913, WA, Australia

*Correspondence to Daniel P. Egli: tel: +64 9 422 6111. e-mail: d.egli{at}auckland.ac.nz.

Interactions between marine reserve populations and non-reserve populations of exploited fishes have generally been modelled using simplistic assumptions about behaviour. Consequently, there is a recognized need for better information on fish movement behaviour at the appropriate spatial scales to generate more realistic interaction models. Automated ultrasonic tracking of marine fish, applied in this study, offers the potential to continuously track individuals for periods of up to several years within the study area. Snapper (Pagrus auratus) (FL: 33–68 cm) were surgically implanted with individually coded ultrasonic transmitters to monitor their movement within the Cape Rodney to Okakari Point Marine Reserve in northeast New Zealand from October 2001 to September 2002. The range of movement patterns observed includes some fish resident for the entire tracking period, while others were more mobile. Of the latter group, some fish left the array permanently while others returned after up to 83 days of continuous absence. Nearly all fish showed some level of site fidelity for varying periods of the time they were tracked. Fish activity peaked in the summer, when highest densities are known to occur. Results suggest that snapper behaviour is variable, and that patterns of habitat utilization vary between fish and also seasonally. Such a complex range of behaviours may be a key component for achieving desirable outcomes for both conservation and fisheries in marine reserves.

Keywords: acoustic tagging, marine reserve, Pagrus auratus, polymorphic behaviour, residency, snapper movement

Received 10 April 2003; accepted 10 May 2004.


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