The key to grabbing the attention of crabs is creating a space for them where they feel at home. Pop some rocks into the net, mix in a dash of seaweed, and your crab-catching masterplan is all set!bing the attention of crabs is creating a space for them where they feel at home. Pop some rocks into the net, mix in a dash of seaweed, and your crab-catching masterplan is all set!Safety Crab Line - with net bag and no hooks