Published Sunday, 20 July 2014
Danny Hunter spotted the animal while out walking along the banks of the river with his son on Sunday afternoon.
The fisherman, who runs local fishery Woodside Angling, said he was shocked to find a dolphin so far away from sea.
He told UTV: "It was close to the Lifford Bridge just off the Old Bog Road - which is about 35 miles away from the nearest sea.
"I heard this breathing noise and at first I thought it was a diver, but then I saw a dolphin swimming in the water.
"I was shocked, you would not think to ever see a dolphin at all in the Foyle, especially off the Boghill Road in Strabane.
"It looks like it is trapped and can't get out until the water rises."
© UTV News