I wrote about this phenomenon a long time ago, but have yet to witness it personally.
I'd like to think my imagination was spot on, but... you'll have to read The Sack They Left Behind and judge for yourself.
And me, I think I may need a nice long trip back to the left coast just to check on those details and follow this story out of LA:
At the Cabrillo Marine Aquarium, they are attempting to establish a captive population of grunion, which means lots of volunteers with flashlights and pails to "milk" the females for eggs.
"Grunion are prey fish -- almost everything eats them. Sea lions, sharks," said aquarium laboratory assistant Andres Carrillo, 25. "I fried some up and ate them myself. Once. Tasted like mackerel."
well. there you go.