STONINGTON — A kayaker had to be treated for mild hypothermia after their kayak started taking on water off the coast of Stonington on Wednesday afternoon.

Chief Petty Officer Matt Burt, a spokesman for the United States Coast Guard, said the Rockland station dispatched a boat to the area of Second Island – an island near Stonington – to assist with the rescue but by the time the Coast Guard boat arrived the kayaker had been rescued by another mariner.

Burt said the kayaker, who was paddling with a group of kayakers around 3 p.m., was transported to shore by the good samaritan and treated by a local ambulance crew for mild hypothermia.

The man or woman was not identified.

Burt said the kayakers, who were wearing life jackets, used handheld radios to notify the Coast Guard that a member of their group was in distress.