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Fish are one of the five groups that Vertebrates which likewise include Amphibians (almost 7,000 species), bird (over 10,000 species), Mammals (over 4,200 species) and Reptiles (about 8,000 species). All vertebrates have actually backbones and spinal columns. There are about 58,000 varieties of vertebrates. Forty percent of every the fishes evaluated in a 2007 survey (3,100 fishes assessed) to be classified as intimidated by the IUCN in 2007. Fish can be discovered in almost all aquatic environments, indigenous high mountain streams to the deepest oceans. There are over 32,000 species making them by far the largest group of vertebrates.

You are watching: A fish that has a flexible skeleton made of cartilage is known as a

Fish are aquatic animals. Many have centralized bodies for fast swimming, are covered with scales with two sets of paired fins, have gills transparent their resides (to extract oxygen from water), number of unpaired fins and also lay eggs. Many fish are "cold-blooded", or ectothermic, enabling their body temperatures to vary as ambient temperatures change. There space exceptions to every one of these.

Fish selection in dimension from eight millimetres (stout infantfish) to 16 metres (whale shark). A whale shark can weigh 14 tonnes and also can swimming at as much as 8 or 9 kph..

Many aquatic animals commonly well-known as "fish" room not fish in follow to the an interpretation above including shellfish, cuttlefish, starfish, crayfish and jellyfish.

Fish are divided into three straightforward groups which encompass Cartilaginous fish, Bony fish (over 29,000 species) and Lobe-finned fish. In some group systems, Bony fish are separated into two groups - the Ray-finned fish and also the Lobe-finned fish.

Lampreys and also hagfish are often classified right into a different group called the Agnatha.

Cartilaginous fish (around 970 species) have actually a skeleton make from cartilage. Cartilaginous fish encompass sharks, rays, skates and also chimaeras (ghost sharks).

Bony fish (also recognized as Ray-finned fish) are the largest of the three groups of fish with virtually 27,000 types such together salmon, trout, lanternfish, cavefish, cods, anglerfish, tarpon, herrings, electrical eels and many more. Bony fish have a skeleton made of bone.

Lobe-finned fish room a team of bony fish that have actually paired fins supported by fleshy lobes v bones. Old lobe-finned fish are thought to be the ancestors that the first four-legged soil vertebrates. Over there are only eight types of lobe-finned fish in presence now consisting of lungfish and also coelacanths.

Diversity the fish

Adult Stout infantfish

Whale shark photo © Ron wolf 2009 Flickr

The jawless fish (or Agnatha) include lampreys and hagfish. Over there are around 100 species. They execute not have actually jaws, scales, a stomach or combine fins but have one embryonic vertebral pillar (notochord) because that their entire lives and also a skeleton make of cartilage.

See more: Franklin D Roosevelt Pic Tures, Roosevelt Pictures

Skeletons do from cartilage are tough and also flexible and allow fish to grow to big sizes and also to swim quickly.

Most fish room covered with scales, some species are extended by scutes (an outside shield-like bony plate). Others have actually no external covering top top the skin. Most fish space covered in a protective layer of slime (mucous). The slick layer of slime permits a fish come move quicker through the water. It fills up the tiny spaces in between the scales to make the fish an ext streamlined. The slimy surface ar helps come suffocate pathogens or helminth trying to get in through the fish"s scales. The mucous also protects any open wounds from additional damage and lets the fish slip through barriers easily. The slime level likewise affects how much water the fish can take in and out -- a thinner slime layer allows an ext water in and out the the fish"s body and a thicker slime layer allows less.

Fish skeletons room composed of one of two people bone or cartilage

Fish by TutorVista Fish with Transparent Head Filmed NationalGeographic because that the very first time, a big Pacific barreleye fish - finish with transparent head - has actually been recorded on film by researchers using remotely operated vehicles in ~ the Monterey only Aquarium research Institute. The deep-sea fish"s tubular eyes pivot under a clean 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://science.jrank.org/pages/1246/Cartilaginous-Fish.html www.flmnh.ufl.inter-base.net/fish/inter-base.netcation/questions/raybasics.html http://en.wikipedia.org/wiki/Shark www.australianmuseum.net.au/Fishes - this website from the Australian Museumcontains thousands of fish reality sheets
Freshwater sawfish
thanks toI would certainly sincerely choose to thank the plenty of members the the Flickr neighborhood who have provided me permission to use their wonderful images for this unit. Your contributions really do this unit come alive! Next: biology of fish...

Biology the fish
Bony fish
Cartilaginous fish
Lobe-finned fish