Sand Fleas Back in the day thats what we would dump out of the King Crab bait jars after the pots soaked a bit. Leave the pot down to long and the fleas will eat the crab too. Some people call them jumping jacks that you find on the beach under kelp and whatnot.
Never know them to be a inhouse problem, Now if your atalken about body Crabs There is the lighter fluid and ice pick way or Kwell!!!