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These include tropical fish, coldwater fish, marine fish and freshwater fish. Tropical Fish. These are the fish that live in either freshwater or saltwater but they need warm or tropical medium or temperature to thrive. Many types of tropical fish are popular aquarium fish because of their bright colors.
The cartilaginous fish, or Chondricthyes, include the sharks, rays, skates, and chimaeras. There are over eight hundred living species of sharks and rays, and about thirty species of chimaeras. Cartilaginous fish are true fish.They have fins and breathe with gills.he cartilaginous fish, or Chondricthyes, include the sharks, rays, skates, and chimaeras. There are over eight hundred living species of sharks and rays, and about thirty species of chimaeras. Cartilaginous fish are true fish.