Amazing FishesAll of us have seen fish. They're very elegant in their colouration and lots of people prefer to have them as pets. A fish may be identified as an aquatic vertebrate animal whose body may or may not be covered by scales and bears two teams of paired fins and lots of unpaired fins. fish are cold blooded or ectothermic animals which mean that their body temperature continues changing using the temperature of water. fish are distributed in all aquatic habitats which range from the mountain streams towards the deepest oceans. About 32,500 species of fish are known plus they together make up the largest diversity from the organisms compared to other classes of vertebrates. fish will also be caught through the fish keepers and are kept in aquaria like a source of decoration. They're also associated with movies, cultures and religions.
The word fish pertains to an animal which implies any non-tetrapod craniate that bears gills throughout its life and has fins instead of limbs. Like other vertebrates fish are of differing types and therefore are
classified according to their characters. The main kinds of fish based in the
camping modern world are the hagfish, sharks, rays, lampreys, ray-finned fish, coelacanths and lungfish. A fish possesses streamlined body to swim rapidly within the aquatic environment, has gills or accessory respiratory organs for getting oxygen and also have paired in addition to unpaired fins. The paired fins range from the pectoral and also the pelvic fins. The unpaired fins would be the dorsal, anal and the caudal fins. Usually the body of the fish is covered with scales but there are some fish also which lack scales and therefore are scale less. The jaws are very well developed in the fish. They're oviparous.
Generally fish are cold blooded vertebrates but exceptions always exist. Tuna, swordfish and some species of sharks have adaptations towards the warm blooded category. The streamlining and also the swimming efficiency of the fish also varies for example tuna, salmon and jacks can swim 10-20 body lengths per second as the eels and sharks cannot exercise than 0.5 body lengths per second. Some species of fish are capable of extracting oxygen directly from the air in addition to through other substances as they bear some specialized structures for this purpose for example lungfish have paired lungs, gouramis have labyrinth and catfish extract oxygen through the intestine or even the stomach. The shape of the body as well as the arrangement of the fins is also variable. The scales are of differing types such as the placoid, cosmoid, ganoid, cycloid and ctenoid. There are specific fish also which survive land like the mudskippers which survive the mudflats as well as on being disturbed hide themselves within their underground burrows.