NSW Police are searching for a 19-year-old man, believed to be from Ballarat, who went missing after a boat overturned on the Murray River yesterday.According to a police statement, three men, all from the Ballarat region were in a small tin fishing boat on the river near Nyah when it overturned about 1.35pm.Police and emergency services recovered two men from the water, who were treated for hypothermia.The 19-year-old man remains missing.Deniliquin Local Area Command, Victoria Police divers and State Emergency Service volunteers resumed their search this morning.