I have built a sucker trap out of 1/4" hardware cloth. The openings are about 2-1/2" diameter.
After two nights soaking in a local pond, I have caught one crayfish - no suckers. First night I used styrofoam pellets and Fritos. Second night I used cabbage. Both of these baits were recommended in online fishing forums. A friend swears by Old Roy dog food, but he can't catch 'em either with dog food.
Anybody have real success catching suckers with a trap? What is the best bait you use?