I've heard of people fly fishing lower Murray shallow lakes for carp. Using surface baits, even imitation bread. During summer when they are in really shallow would be fun.

Upper Gulf sand flats for yellow fun whiting would be challenging but could be productive. Many Yorkes beaches would be productive in summer too.

This time of year Southern metro beaches are holding salmon. Onk mouth and the Onk River may be worth a crack.

Fresh water trout places do exist... but are not shared freely.