XP - ?
Drop - Raw Fish, Fish Egg
Heath - ?
Attack - N/A
Spawn - Water

Summary Edit

Small fish are passive mobs normally found in oceans. They come in a variety of colours and are usually found in large groups. The red ones however are piranhas and will attack you if you are near them. When a normal fish is killed (by a player) they may drop a fish egg, right clicking with the egg in hand will place a baby fish (green rectangle thing), which will eventually become a fish.

If you hit a fish with a fishing rod then reel it in and kill it, it will drop a raw fish.

Source - Minecraft Forums

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