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发布于:2018-3-21 07:23:01  访问:364 次 回复:0 篇
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Amazing Fishes
Amazing Fishes
All people have seen fish. They are very elegant within their colouration and lots of people like to keep them as pets. A fish may be identified as an aquatic vertebrate animal whose body may or may not be included in scales and bears two teams of paired fins and many unpaired fins. fish are cold blooded or ectothermic animals which mean that their body temperature keeps on changing using the temperature of water.
The term fish pertains to an animal which implies any non-tetrapod craniate that bears gills throughout its life and has fins rather than limbs. Like other vertebrates fish are of differing types and are classified according to their characters. The primary kinds of fish based in the modern world would be the hagfish, sharks, rays, lampreys, ray-finned fish, coelacanths and lungfish. A fish possesses streamlined body to swim rapidly in the aquatic environment, has gills or accessory respiratory organs to get oxygen and also have paired as well as unpaired fins. The paired fins range from the pectoral and the pelvic fins. The unpaired fins would be the dorsal, anal and the caudal fins. Usually the body from the fish is covered with scales but there are several fish also which lack scales and are scale less. The jaws are very watauga fly fishing well developed in the fish. They`re oviparous.
Generally fish are cold blooded vertebrates but exceptions always exist. Tuna, swordfish and some types of sharks have adaptations towards the warm blooded category. The streamlining and the swimming efficiency of the fish also varies for instance tuna, salmon and jacks can swim 10-20 body lengths per second as the eels and sharks cannot move more than 0.5 body lengths per second. Some species of fish have the capability of extracting oxygen directly from the environment in addition to through other substances because 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 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 live on the mudflats and on being disturbed hide themselves within their underground burrows.
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