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The fish all members of paraphyletic group of organisms consist of all gill bearing aquatic animals craniate missing limb digits. This definition live Nyálkahal, reel fish and cartilaginous and bony fish, as well as various extinct related groups. Most fish ektoterm ("cold-blooded"), which allows the body temperature change of the environmental temperature changes, although some large active swimmers like white shark and tuna can hold a higher internal temperature. Fish are common in most water bodies. They can be found in almost all aquatic environments, from high mountain streams (eg, char and gudgeon) to the Abyssal song even if the depth of the deepest oceans (eg gulpers and anglerfish). The 32,000 species, fish exhibit greater species diversity than any other group of vertebrates.
Fish are an important resource worldwide, especially in the food. Commercial and subsistence fishers hunt fish in wild fisheries (see fishing) or farm them in ponds or in cages in the ocean (see aquaculture). They are also caught in recreational fishers, kept pets, raised by fishkeepers, and exhibited in public aquaria. Fish had a role in culture through the ages of deities, religious symbols, and the subjects of art, books and movies.
As the "fish" concept negatively, and excludes the tetrapods (ie, the amphibians, reptiles, birds and mammals), which is a derivative of the same origin, it is paraphyletic, and is not considered an appropriate grouping of systematic biology. The traditional expression Pisces (also ichthyes) is considered a typological, but not phylogenetic classification.
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Tags: fisch wallpaper , biologie ektoterm , di pesci immagini di dimensioni piccole , wallpapers peixes , tamboril peixe cartilagineo