If you're looking for a feed of fresh fish you're better off avoiding eating fish caught west of the Sydney Harbour bridge and the Cooks river which has contaminated sediment from industrial waste even though the water appears to look clean. There a signs posted up at these areas to warn anglers, although some people choose to ignore those warnings.
Tom Uglys Bridge, Clifton gardens, Balmoral, Kurnell groynes, Dolls point, La perouse and the end of port botany can be productive areas to try.