At night an hour after lights turnoff, when crab feels safe to venture out in the open, use a flashight covered with a red plastic or lens ( to make light red) so that crab can't see the light. Use a metal or hard plastic stick/Ice pick... scure the bastard.... works for me everytime... about 40 times already... and thats without the redlight... regular light gets them disoriented and only leaves U with a few seconds before they get their barrings straight and run 4 cover..