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| | List of U.S. state fish|State Fish Information (Site not responding. Last check: 2007-10-21) |
 | | Taxonomically, fish are a paraphyletic group whose exact relationships are much debated; a common division is into the jawless fishes (class Agnatha, 75 species including lampreys and hagfish), the cartilaginous fishes (class Chondrichthyes, 800 species including sharks and ray (fish)rays), with the remainder classed as bony fishes (class Osteichthyes). |
 | | All sharks in the family Lamnidae — shortfin mako, longfin mako, white, porbeagle, and salmon shark — are known to have the capacity for endothermy, and evidence suggests the trait exists in family Alopiidae (thresher sharks). |
 | | Fishes can be found in almost all large bodies of water in either salt, brackish or fresh water, at depths ranging from just below the surface to several thousand meters. |
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