A long time ago in a galaxy far away, in the early 1960s I was around 5 or 6. Back in the day, during the day, old movies would be played on the television. There weren't too many channels, but we had cable, so had more than most. I remember being enthralled with a Japanese movie, early Anime, and I've been searching for it for years. Since I remember watching it in the early 1960's, I believe the film could have been made in the 1940's, 1950's or even the very early 1960's. Here's what I remember:
The hero is a young boy. He is surrounded by magical / godlike beings who sometimes take human form. At one point he runs to some docks with a girl. She dives from the dock into the water and turns into a fish. I remember that this scene was dark and stormy. Also, there is an old hag in the film as well.