Canned catfood. Pop holes in the lid, add it to your trap. Seriously.
The best bait used for opilio crab fishing is probably Squid. Cod or salmon can be used in some cases but squid is a cheaper better alternative to most all crab fisherman.
The most effective bait for crab fishing is typically raw chicken necks or fish heads.
Any bait that resembles a small minnow, or crab.
The most effective type of crab bait for fishing is fresh fish or chicken necks. These baits are known to attract crabs due to their strong scent and taste.
cod 4 is a pretty good game cod 5 is better
Lure
Salmon or young of sardines
You need to be more specific as to what species??
fish sum times herring
leaches
yes, you do put bait on a fishing hook.
Clams, squid, and small bait fish is what I've had most of my luck with. They'll eat just about any bottom bait like crab or worms.