Summary

Seasonal changes in reproductive condition of black bream (Acanthopagrus butcheri) and the distribution and abundance of fish eggs were investigated in Coila lake in southern NSW coast.  The results highlight that black bream have an annual reproductive cycle and spawn at dusk during spring and summer (August to February), with peak reproductive activity occurring during September and October.  Comparisons between lake and riverine environments with female reproductive condition highlighted that spawning females were largely restricted to the upper reaches of the riverine environment.  Similarly the distribution and abundance of fish eggs during September and October were also highest in the upper riverine environment.  Black bream attain sexual maturity at a small size (12-20cm) and would spawn at least once before being legally exploitable.  Age and growth data highlighted that black bream are a slow growing and long-lived species.  Results from this study are currently being used to examine potential future management options to provide better protection to black bream spawning aggregations.