Cavefish
Fish adapted to life in caves / From Wikipedia, the free encyclopedia
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Cavefish or cave fish is a generic term for fresh and brackish water fish adapted to life in caves and other underground habitats. Related terms are subterranean fish, troglomorphic fish, troglobitic fish, stygobitic fish, phreatic fish, and hypogean fish.[1][page needed][2]
There are more than 200 scientifically described species of obligate cavefish found on all continents, except Antarctica.[3][4] Although widespread as a group, many cavefish species have very small ranges and are seriously threatened.[5][6] Cavefish are members of a wide range of families and do not form a monophyletic group.[7] Typical adaptations found in cavefish are reduced eyes and pigmentation.[1][2]