Gangles

Hi Guys, I am a newbie to the forum, so would just like to say hi to all to start. I have a couple of questions im hoping you can give me some information on. I was fishing down at Moroya/Browlee on the weekend and after 3 trips out to the rocks (both places about 12 hours in total) we had a total of a about 4 bites. We tried different times/tides/tackle and baits but nothing was working, does anyone know why the fishing might have to ordinary?? Just as a note - I was at the same place about month earlier and we ended up catching a total of about 25 fish (threw all back- only 4-5 keepers in the lot anyway). Second question wanting to head out in the boat in about december down south coast (batemans bay, Moroya and the like) can anyone tell me if there are some good spots up the rivers worth trying?? Any information would be great, thanks guys.