Fish
Every world with open water has up to three species of its own. Their names always end -gill, -fin, -scale or -minnow.
Like all wildlife, fish are generated per world. A name ending in -gill, -fin, -scale or -minnow is always a fish, and the same name is the same fish wherever you meet it.
Raw fish is a little better than raw meat because you didn't have to fight it. Cook it at a Campfire or put it in a Cooking Pot for a Fish Stew or Surf and Turf.