They're 'pistol shrimp'. One of their claws is small, and the other is
rather large, and one of the joints in the big claw cavitates, so I've
heard, when they operate it. I've heard them in Marina del Rey as well as in
San Diego Bay.

Tom Dacon

"Falky foo" wrote in message
om...
Whenever my boat's at anchor or in slip at night, I hear weird rapid and
random clicking noises coming from, I think, the bottom of the boat. It's
sort of the sound of pop rocks on your tongue or really loud champagne
bubbles or of pop corn popping in the microwave (but not that loud).

Somebody told me it was barnacles feeding. Is that right? It doesn't
happen when the boat is moving and I don't remember if it happens in the
day.