These bivalves filter feed on organic detritus and plankton. Once numerus in Monerey Bay, they have been greatlly reduced following the return of the sea otter. They also are preyed upon by sea stars.
Mytilus californianus (Conrad, 1837) California Mussel Mytilus californianus: Very small individuals. Royal Palm State Beach, Los Angeles (Photo by: Dave Cowles, April 4, 1993)
