Countless times I’ve been walking along a bridge or wharf, checking out what people are catching, and seen them throwing back so-called ‘trash’ fish, in the hope of catching a bream, snapper, flathead or other such ‘desirable’ species. The fish that find their way back are often the slimy mackerel, yellowtail scad (yakkas), leatherjacket, mullet and salmon. While I love…