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Jim the Fish was a friend of the Eleventh Doctor and River Song, whom they met on one of their adventures. When they met him, he was building a dam. He was still doing so some time later when the Doctor checked up on him. (TV: The Impossible Astronaut)
River Song's diary contained an entry called "The Ballad of Jim the Fish." (GAME: The Eternity Clock)
"Gym or Jim the fish" Was never a person. It was a position. So we won't ever see it properly elaborated upon on telly.