FISH is a cold-blooded vertebrate (having a backbone), typically possessing paired fins, gills and, usually, scales. These characteristics separate fish from warm-blooded mammals and the cold-blooded reptiles and amphibians. Fish are generally grouped as primitive jawless fish, such as the hagfish and LAMPREY; fish with cartilaginous skeletons, including SHARK, ray and ratfish; and the common bony fish, including STURGEON, SALMON, TUNA and many others. Of the approximately 21,000 species of...

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