1. Laboratório de Ecologia e Conservação, Centro de Estudos do Mar; Universidade Federal do Paraná, Av. Beira Mar s/n, PO Box 61; Pontal do Paraná 83255-000 Paraná Brazil
2. New South Wales Department of Primary Industries; Fisheries Conservation Technology Unit, PO Box 4321; NSW 2460 Australia
3. Marine and Estuarine Ecology Unit, School of Biological Sciences; University of Queensland; Brisbane, QLD 4072 Australia