The Coast Guard received a mayday radio call at 10:53 p.m., followed by a radio report from someone who said a boat had collided with another vessel and that someone was in the water.
Rescue crews began searching the water near the Richmond-San Rafael Bridge, but found no one in distress and no debris that would suggest two boats had crashed, according to the Coast Guard.
The Coast Guard called off the search at 8:15 a.m. Rescuers from Marin County, Tiburon and San Rafael also participated in the search.
