Fish Information

A fish is any aquatic vertebrate animal that is covered with scales, and equipped with two sets of paired fins and several unpaired fins. Most fish are ectothermic . Fish are abundant in most bodies of water. Fish can be found in high mountain streams and in the deepest ocean depths . According to FishBase, 31,500 species of fishes had been described by January 2010.

Food prepared from fish is also called fish, and is an important human food source. Commercial and subsistence fishers "hunt" them in wild fisheries or "farm" them in ponds or in cages in the ocean . They are also caught by recreational fishers and raised by fishkeepers, and are exhibited in public aquaria. Fish have had a role in culture through the ages, serving as deities, religious symbols, and as the subjects of art, books and movies.

The term "fish" most precisely describes any non-tetrapod craniate that has gills throughout life and whose limbs, if any, are in the shape of fins. Unlike groupings such as birds or mammals, fish are not a single clade but a paraphyletic collection of taxa, including hagfishes, lampreys, sharks and rays, ray-finned fishes, coelacanths, and lungfishes.

Wikipedia, Fish, http://en.wikipedia.org/wiki/Fish (as of Apr 1, 2010)

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