This tale sounds a bit fishy.

In a documentary movie that premiered at Utah’s Slamdance Film Festival last week, a man details his year-long affair with a dolphin. No word yet on when “Dolphin Lover” will be coming to a theater — or aquarium — near you.

Malcolm Brenner, now 63, says he was working as a photographer at Sarasota theme park Floridaland in 1971 when he met Dolly, a female dolphin. He tried to remain pure, he claims, but Dolly seduced him.

“At first I discouraged her, I wasn’t interested,” Brenner says in the movie. “After some time I thought, ‘If this was a woman would I come up with these rationalizations and excuses?’ ”

He finally succumbed to the dolphin’s advances.

“I started rubbing her along her back, working my way to her flukes — her tail,” he says. “And as I was rubbing her and moving my hand towards her tail, Dolly was slowly rolling around her long axis.”

Then other stuff happened, requiring the mismatched couple to elude “the male dolphin so we could spend some time alone.”

This is hardly the first human-dolphin romance. A BBC documentary that aired last year, “The Girl Who Talked to Dolphins,” told the story of a dolphin who fell in love with a female research assistant in 1965.