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The home-range size and location of reef-associated snapper Pagrus auratus: Sparidaewere investigated by use of a radio acoustic-positioning telemetry (RAPT) system. Tags were surgicallyimplanted in 5 snapper that were subsequently monitored every minute for a period of 5 mo,and then intermittently over another 7 mo. Site fidelity was high amongst these fish, with homeranges not exceeding 650 m in diameter or 139 600 m2 in area. Eleven other snapper received tags byfeeding and were tracked for periods of up to 2.5 d. Site fidelity was also high for these fish, with standardisedestimates of home-range size not differing between the 2 groups. Home ranges overlappedconsiderably, indicating that the fish were not territorial. The location of the home ranges generallyremained stable throughout the entire tracking period, although 1 fish relocated its home range by~220 m. A new method of home-range estimation was developed, which matched the level of detailprovided by the RAPT system, to directly estimate the time spent in an area. The relevance of thismethod and the residential behaviour of these fish are discussed, with reference to the generalunderstanding of animal behaviour, previous investigations into snapper movement, and the selectivecapacity that may be imposed by marine reserves on fish behaviour.

Snapper Pagrus auratus (Sparidae) home range dynamics: acoustic tagging studies in a marine reserve