there is a zone right the way along there where you cannot fish. I suggest you get hold a Moreton Bay Marine Park Guide as it will show you clearly where it is. As for the crabs there are plenty around in Bramble bay from Redcliffe to the Brissie river. Depth doesnt really matter, but they do like sandy , shelley or weedy bottoms, not mud. They are being caught in 20 metres and also 2 metres right through the bay, now is the time to start chasing them