The story is about a small
rainbowfish with shiny, multi-colored
scales, unlike the other fish from his shoal. (However, besides his blue, green, violet/purple, and pink scales, he had shiny silver scales among them.) One day, a small
bluefish (named Blue in the
TV series) who envied the shiny scales asks the Rainbow Fish if he could have one of his silver scales. The Rainbow Fish responds and refuses in a
rude manner. The small blue fish tells the other fish about the Rainbow Fish's harshness, and as a result, the other fish do not want to play with him anymore. His only remaining friend, the
starfish, tells him to go visit the wise
octopus (named Wanda in the TV series) for advice. When he goes to the cave where she lives, she says she has been waiting for him and that the waves have told her his story. She then advises that the Rainbow Fish must share his scales with the other fish. She continues that if he shares his scales, he may no longer be the most beautiful fish, but he should "discover how to be happy". The Rainbow Fish tries to say that he cannot share his favorite scales, but Wanda disappears in a cloud of ink. When he encounters the small blue fish again, the Rainbow Fish shares one of his precious silver scales and sees the little fish's joy. Though one of his shiny scales is gone, he immediately feels much better. Very soon, the Rainbow Fish is surrounded by the other fish requesting scales, and he shares one with each of them. Soon, everyone in the ocean has one shiny silver scale (including the Rainbow Fish). (All his scales were gone – all but one.) Even though he gave away all his silver scales and only had one left, the Rainbow Fish is finally happy. ==Theme==