Fish
Fish are aquatic creatures native to Rayman's world.
In Rayman 1
Fish make their first appearance in Rayman 1, in the Dream Forest, appearing as large piranhas, who soon become one of the recurring elements of the following games. They jump out of the water and take only one hit to defeat; when this task is done, the piranha's teeth shatter.
Fish re-appear in the Caves of Skops, in the Eat at Joe's level. There are three kinds here, all with over-exaggerated facial features: One has a large nose, useful for pushing bouys around, one has lots of teeth, which are very effective at hurting Rayman and the other species has an abundance of hair, which serves no purpose in the level. They do not appear again in the game.
In Rayman 2
Fish appear in Rayman 2 more often than they did in Rayman 1. The firt time a fish is seen is when Rayman attempts to cross The Fairy Glade in search of Ly. Under the water, several types of fish can be seen. Later on in the Glade, Rayman must cross a marsh full of dirty water. A Stone of Thought is next to it; Murfy's advice is to not swim in it. True enough, the marsh is infested with piranhas. Piranhas are next seen in Whale Bay, trying to eat Carmen the Whale's air bubbles, since they suffer from heartburn. Carmen herself is not strictly a fish, whales are actually mammals.
In Rayman 3
The piranhas appear twice more in the console version of Rayman 3. At a specific part in Clearleaf Forest, Rayman and Globox must ascend a rushing waterfall whilst avoiding piranhas. Once the duo have reached the top, the piranhas stop attacking.