National Wildlife Federation




Some common fish are catfish, sharks, salmon, trout and sturgeon.

To identify an animal as a fish, it should have these characteristics:

  • Fish live in water.
  • Fish have a backbone. They are vertebrates.
  • Fish breathe using gills. They absorb oxygen through the gills.
  • Almost all fish are cold-blooded. Two of the exceptions are the tuna and the Pacific salmon shark, which can raise their body temperature to some degree.
  • Some fish have scales.

Customer reviews

No reviews were found for Fish. Be the first to review!