A 77-foot commercial fishing boat that ran aground three blocks from the Manasquan Inlet in Point Pleasant Beach last week sank while it was being towed from the area, a U.S. Coast Guard spokesman said Sunday. The Coast Guard received a report of the boat being beached shortly before 5 a.m. Friday. Crews worked all day Saturday to get the boat afloat. As a salvage company was towing it away, the vessel sank in 48 feet of water about a half mile from Manasquan Inlet around 2 a.m. Sunday, U.S. Coast Guard Petty Officer First Class Matthew West said.