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EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/VERTEBRATES > FISH
Definition:
Fish are, broadly speaking, any poikilothermic (or organism whose
body temperature varies according to the temperature of its surroundings)
legless, aquatic vertebrate that possesses a series of gills on each side
of the pharynx, a two-chambered heart, no internal nostrils, and at least
a median fin as well as a tail fin.  
Reference:
Allaby, M. 1998. A Dictionary of Ecology. Oxford University Press. Oxford, New
York.
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