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Fish
| Fish are cold-blooded aquatic vertebrates with gills. The three major groups are eels and hagfishes, sharks and rays (cartilaginous fish), and finfish or bony fish such as sturgeons, carp, or Nile Perch catfish. There are about 25,000 species of fish and at least 800 species are threatened. Inland waters and marine ecosystems are their major ecosystems. Many inland waters and their endemic fish species are threatened from habitat loss (dams), introduced species, and the aquarium trade. |
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Keywords Class Chondrichthyes, sharks, rays, chimaeras, Class Osteichthyes, bony fish, sturgeon, bowfins, catfish, Superclass Agnatha, lampreys, hagfish, fish, vertebrate, fauna, protection, conservation, habitat, animals, finfish, native, nonnative, endemic, biotechnology, migratory, fisheries |



