The Little Mermaid en 1976

 This 1976 film shows plenty of wonderful mermaid footage under the sea. Back then the swimmers had only small flippers, so they had to ripple their legs in a very quick motion for movement.
The underwater scenes are only in the beginning of the movie, but they are marvelous!! (I can't figure out how those swimmers could be in the water with all those jellyfish!!). You can find this movie to rent at Netflix and it is directed by Vladimir Bychkov. Again, this version of Anderson's famous story is a little different, almost a completely new story. Be forewarned that there is nudity in one scene, and portrayals of a witch performing magic. Other than those the whole family will enjoy this one.