"A Catfish Tale" is the second half of the twenty-ninth episode of Sagwa, the Chinese Siamese Cat.
Synopsis
Yeh-Yeh is having a talk with his nieces - Catfishes! Sagwa does not believe that her cousins are fishes at first, but then her uncle, a catfish, tells her the legend of how the catfish came to be, she finally understands. And she learns to respect the elders along the way.