Originally Posted by jrd22
A lot of people swear by the seafood cat food cans, just make a few holes in the can and put it in the bait jar.
I'm one of those that swear by seafood cat food, but as mentioned fish heads and pellets work well. Some say chicken, however I've never tried it. I'm a little reluctant to use fish heads though...fishheads make a great soup, so it seems a waste to me.
I agree with JRD, you need to use a crab pot and leave it for a while as mentioned. Charlie has the debth right but look for a small river emptying into a bay. So if you find a relatively flat area under 80' with a river, this could be a good location IMHO.
Try to avoid the days around full moons. I believe crabs molt around full moons and are soft with little meat. I know this is highly questionable but it seems to be the case for me.
Molting and the Full Moon
Good luck and be patient, eventually you will strike it rich
 I don't know your area but this is what works for me up here.