What are the fish?

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Fish are a heterogeneous group of vertebrates consisting of 22,000 species, approximately. Are aquatic, cold-blooded, their bodies covered with scales, and gill respiration. Their limbs have evolved into fins variable appearance. Their size ranges from 10 mm in length (Indian Ocean governments) and 18 meters (whale shark). The bodies of the fish may be depressed as in the stripes, tapered like the shark, or have other very different forms. According to the characteristics of the skeleton can be classified in Osteichthyes (bony skeleton have) and Chondrichthyes (cartilaginous skeletons have). Among the former are: the golden, the catfish, perch, tuna, sea dragon, and among the latter are: shark, rooster fish, torpedo fish, the fish devil and the sawfish.

Many species are piscivorous, ie feed on other fish (perch, bass, cod). The shark, a very voracious animal, besides catching fish feed on sea birds, porpoises, sea lions, and sometimes attacks man.

How do fish breathe?

Fish breathe through gills located in the pharynx, between the mouth and digestive tract. The oxygen in the water absorbed through the gill membrane and reaches the blood. Likewise, the carbon dioxide from the blood crosses the gills and dissolves in water.

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