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Pisces paraphyletic group aquatic vertebrate animals. An extensive group of jawed which are characterized by gill breathing at all stages of post-embryonic development of an organism. Fish live in both saltwater and freshwater in reservoirs from deep ocean basins to mountain streams. Fish play an important role in most aquatic ecosystems as a component of the food chain. They are of great economic importance to humans because of their use in food.
It was believed that the most ancient jawless animals that resemble fish are known from the Early Ordovician. However in 1999 in the Chinese province of Yunnan fossils of fishlike creatures were found Haikouichthys from the group jawless age about 530 million years old. Perhaps these forms were the ancestors of all vertebrates .
Fossils of lobe-finned fish Osteolepis macrolepidotus from the middle of the Devonian period Honors from jawless first became the jaw a derivative of one of the gill arches. Furthermore jaws fish have paired fins inner ear with three semicircular canals and gill arches. Despite the emergence of the first jawed more in the Ordovician they occupied a subordinate position until the Devonian. Thus jawless existed more than 100 Myr under predominance Agnatha in contrast to the present time. Cartilaginous fishes appeared at the turn of the Silurian and Devonian about 420 million years ago and flourished in the Carboniferous . Sarcopterygii inhabit the world's oceans since at least the Devonian it is possible that they existed already in the Silurian. Oneiros Guiyu the earliest known lopasteporaya.
More than half of all living species of vertebrates namely according to the database FishBase about 31 thousand species are fishes. The number of recognized species continues to change as a result of discoveries of new species and taxonomic revision of certain groups. Living fish are represented by three classes cartilaginous lopasteporye and actinopterygii. The last two classes form a group of bony.
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