Petty Officer Caleb Critchfield says the search was halted at sundown Sunday and rescuers have no plans to resume it.
He says the decision was made reluctantly after searching more than 5,000 square miles of ocean over more than 30 hours, well beyond the "window of survivability."
The crewmembers -- Alan Cahill, of Tiburon, Calif.; Jordan Fromm, of San Rafael, Calif.; Elmer Morrissey, of Ireland; Alexis Busch, of Larkspur, Calif. -- were thrown into the 50-degree waters when a series of disastrous events caused their sailboat to run aground during a race Saturday near the Farallon Islands, about 25 miles offshore.
The body of 46-year-old Marc Kasanin of Belvedere, Calif., was pulled from the water hours after the accident. The three remaining crew members survived.