Arrow crabs eat them.
I have trapped them with home-made traps. Take a small plastic yogurt container with a lid. Cut off the bottom. Silicone a piece of screen forming an inverted cone shape inside, leaving a small opening at the "tip" of the cone for the wworme to crawl in. Make sure that there are a couple of inches between the tip of the cone which is in there and the lid (which will now be the bottom of the container). Take off the lid, put a piece of shrimp in there, put the lid back on and attach fishing line so that you can just lower your container/trap in there. They crawl through the hole at the tip of the screen cone and get the shrimp but they cannot get back out. It is the same idea of the purchased tube that you see at the stores. When youi pull it up you just take the lid off, empty the worms, re-bait the trap and place it back in there.
Sound complicated? It is not. You can call me.
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Tamie