A fisherman was in critical condition after being rescued from Megansett Harbor in North Falmouth Sunday morning after he was found unresponsive in the water, Falmouth police said in a prepared statement. The man’s fishing companion alerted area residents, who pulled him from the water. He was resuscitated and taken to Falmouth Hospital. The man was identified as a 69-year-old Somerville resident, though police did not release his name. A spokeswoman for Cape Cod Health Care, which owns Falmouth Hospital, said Sunday evening the man was in critical condition. An investigation is being conducted by Massachusetts Environmental Police.