Hi Breeze
I have to agree with the general concensus that the enviroment can come back. The Parramatta river was almost considered a dead river in the 80's but has come back in a big way.
I mostly fish at Glebe and have seen the area change from catching a couple of bream and leatherjacket to oysters coming back on the rocks and catching bream, flathead, whiting, flounder, trevally, tailor and some guys say mulloway night fishing. There are also many small snapper in Blackwattle Bay and hopefully these will provide larger versions in the harbour and offshore in the future.