Abstract
About 4000 barramundi were tagged in the four major river systems in Van Diemen Gulf in 1977/1978 to determine migration patterns and exchanges of fish between rivers, and to estimate fishing mortality. Some exchange of barramundi between rivers occurred. A general seaward migration of mature fish into coastal areas was associated with spawning. There was no evidence of a movement of spent fish back to inland waters after spawning. The overall recovery rate of legal-sized fish (≥58 cm TL) was highest in the Mary River (19%), followed by the East Alligator River (12%), South Alligator River (8%) and West Alligator River (2%). Annual fishing mortalities for specific localities ranged from 0.15 for inland waters well outside the commercial fishing grounds to 0.45 in coastal waters within the commercial fishing grounds, reflecting the general seawards movement of fish from inland areas and their subsequent recruitment to the commercial fishery.
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