teach me how to fish with cracked crab

[keakar]

like the title says, I need some edumacation on this.

I have tried using it several times with using half of a 3" crab point to point Carolina rigged or just put on a jig head but every time I check my bait, the crab comes up looking like its been vacuum cleaned sucked out empty shell even after only a few minutes in the water and I never get a bite or even a nibble that I can detect so I would assume it must be those little tiny minnows cleaning it out like pirana.

people claim this is a great bait so I must be doing something wrong here.

please proceed to edumacate me