|Home| About nlinux.org| Contact nlinux.org| Seaweek| Site Resources| Marine Links| Internationwide News| nlinux.org History|
Fish are among the 5 teams of Vertebprices which also encompass Amphibians (practically 7,000 species), Birds (over 10,000 species), Mammals (over 4,200 species) and Reptiles (about 8,000 species). All vertebrates have actually backbones and spinal columns. Tbelow are around 58,000 species of vertebprices. Forty percent of all the fishes evaluated in a 2007 survey (3,100 fishes assessed) were classified as endangered by the IUCN in 2007. Fish can be discovered in virtually all aquatic atmospheres, from high mountain streams to the deepest oceans. Tright here are over 32,000 species making them by much the largest group of vertebprices.
You are watching: A fish that has a flexible skeleton made of cartilage is known as a
Fish are aquatic animals. Most have centralized bodies for rapid swimming, are extended via scales with two sets of paired fins, have gills throughout their resides (to extract oxygen from water), numerous unpaired fins and lay eggs. Most fish are "cold-blooded", or ectothermic, allowing their body temperatures to differ as ambient temperatures change. There are exceptions to every one of these.
Fish variety in size from eight millimetres (stout infantfish) to 16 metres (whale shark). A whale shark can weigh 14 tonnes and also have the right to swim at up to 8 or 9 kph..
Many type of aquatic pets typically well-known as "fish" are not fish in according to the meaning above consisting of shellfish, cuttlefish, starfish, crayfish and also jellyfish.
Fish are split right into three standard groups which include Cartilaginous fish, Bony fish (over 29,000 species) and Lobe-finned fish. In some classification devices, Bony fish are split right into 2 groups - the Ray-finned fish and also the Lobe-finned fish.
Lampreys and also hagfish are often classified right into a sepaprice group dubbed the Agnatha.
Cartilaginous fish (about 970 species) have a skeleton made from cartilage. Cartilaginous fish encompass sharks, rays, skates and chimaeras (gorganize sharks).
Bony fish (additionally known as Ray-finned fish) are the largest of the 3 groups of fish via almost 27,000 species such as salmon, trout, lanternfish, cavefish, cods, anglerfish, tarpon, herrings, electric eels and many kind of more. Bony fish have actually a skeleton made of bone.
Lobe-finned fish are a group of bony fish that have actually paired fins supported by fleshy lobes through bones. Ancient lobe-finned fish are thmust be the ancestors of the initially four-legged land also vertebrates. There are only eight species of lobe-finned fish in presence currently including lungfish and coelacanths.
Diversity of fish
Adult Stout infantfish
Whale shark Image © Ron Wolf 2009 Flickr
The jawless fish (or Agnatha) include lampreys and also hagfish. Tright here are around 100 species. They perform not have jaws, scales, a stomach or paired fins however have an embryonic vertebral column (notochord) for their entire lives and also a skeleton made of cartilage.
Skelelots made from cartilage are hard and functional and allow fish to thrive to huge sizes and to swim easily.
Most fish are covered with scales, some species are covered by scutes (an external shield-favor bony plate). Others have actually no outer extending on the skin. Most fish are spanned in a protective layer of slime (mucous). The slick layer of slime permits a fish to move faster through the water. It fills up the tiny spaces in between the scales to make the fish more centralized. The slimy surchallenge helps to suffocate pathogens or parasites trying to enter through the fish"s scales. The mucous likewise protects any type of open wounds from additionally damages and also lets the fish slip via obstacles easily. The slime level also affects how a lot water the fish have the right to take in and out -- a thinner slime layer permits more water in and also out of the fish"s body and a thicker slime layer enables less.
Fish skelelots are composed of either bone or cartilage
|Fish by TutorVista||Fish With Transparent Head Filmed NationalGeographic For the initially time, a big Pacific barreleye fish - finish with transparent head - has actually been captured on film by scientists using remotely operated vehicles at the Monterey Bay Aquarium Research Institute. The deep-sea fish"s tubular eyes pivot under a clear dome.|
|References http://en.wikipedia.org/wiki/Fish http://animals.about.com/od/fishes/a/tenfactsfishes.htm www.enchantedlearning.com/subjects/fish/printouts/bonyfish.shtml http://en.wikipedia.org/wiki/Chimaera http://en.wikipedia.org/wiki/Osteichthyes http://en.wikipedia.org/wiki/Sarcopterygii http://en.wikipedia.org/wiki/Chondrichthyes http://endoftheline.com/campaign/fish_facts http://en.wikipedia.org/wiki/Agnatha http://animals.howstuffworks.com/fish/eels-slippery.htm/printable http://en.wikipedia.org/wiki/Fish_anatomy http://scientific research.jrank.org/pages/1246/Cartilaginous-Fish.html www.flmnh.ufl.nlinux.org/fish/nlinux.orgcation/questions/raybasics.html http://en.wikipedia.org/wiki/Shark www.australianmuseum.net.au/Fishes - this website from the Australian Museumincludes numerous fish truth sheets|| |
|Biology of fish|