Growth and viability of hatchery-reared Argyrosomus japonicus released into open and semi-closed systems
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چکیده
Hatchery-reared Argyrosomus japonicus (Temminck & Schlegel) were released into estuaries of varying habitat between 1996 and 2004, and growth and recruitment to the fishery evaluated. Fish stocked earlier in summer had significantly faster growth rates (P < 0.01), and post-stocking mortality ranged from 1.1% to 11.7% within 7 day post-release. Argyrosomus japonicus stocked in the Georges River in 2003 and 2004 yielded fishery independent recapture rates up to 0.2%. For A. japonicus stocked in Smith s Lake in 1997 and 2004, growth rates, timing of recaptures and increases in commercial catches suggested recruitment to the fishery by 18 months. The 1997 stocking led to a 30-fold increase in A. japonicus catch, but stocking was not financially viable, with a cost:benefit ratio of 2.1. Small, shallow coastal lagoons may represent experimental units for refining stocking strategies, but are not optimal for A. japonicus. The potential for density-dependent effects, and complex relationships between growth, habitat and mortality, highlighted the need for a thorough understanding of species – system interactions. Pilot releases can contribute to this understanding, particularly assessment of habitat requirements, and season, site and size-of-release.
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