Fish will eat other smaller fish and be eaten by the bigger ones, sometimes swimming away from them, including the player. Small fish come in schools and don't eat anything. It does not matter what kind of fish is it to be faster or slower. But, small fish in schools come fast, the barracuda and the intruder come too. Some fish do not exist (like Clownfish, Blobfish, Lobsters, Guppies, Blue Tangs, Chigoon Fish, etc.)
All the fish:Edit
For character fish see Characters.