fish

Fish is a member of the vertebrate poikilotermik (cold blooded) [1] that live in water and breathe with gills. Fish is the most diverse vertebrate species of more than 27.000 worldwide. In taxonomy, fish belong to a paraphyletic group kekerabatannya relationship is still debated; usually fish without jaws were divided into fish (class Agnatha, 75 species including lampreys and fish Hags), cartilaginous fish (class Chondrichthyes, 800 species including sharks and rays), and the rest classified as hard bony fish (class Osteichthyes). Fish in various regional languages is called Iwak (jv, Bjn), jukut (vkt). Fish has a variety of sizes, ranging from whale sharks measuring 14 meters (45 ft) to stout infantfish that only 7 mm (about 1 / 4 inch). There are some aquatic animals that are often regarded as the "fish", such as whales, fish, squid and dugongs, which are not classified as fish. Table of contents [Hide]

    * 1 Classification
    * 2 Fish Ecology
    * 3 Footnotes
    * 4 See also
Classification Fish is parafiletik group: this means, every class that contains all the fish will also include non-fish tetrapod. On this basis, groupings such as the Class Pisces, as in the past, no longer fit for use. These are units that include all vertebrate fish commonly known as:

    *
          o
                + Subclass Pteraspidomorphi (not berahang primitive fish)
          o Class Thelodonti
          o Class Anaspida
          o (no status) Cephalaspidomorphi (not berahang primitive fish)
                + (No status) Hyperoartia
                      # Petromyzontidae (lampreys)
          o Class Galeaspida
          o Class Pituriaspida
          o Class Osteostraci
    * Infrafilum Gnathostomata (vertebrates berahang)
          o Class Placodermi (armored fishes, extinct)
          o Class Chondrichthyes (cartilaginous fish: sharks, rays)
          o Class Acanthodii (spiny sharks, extinct)
    * Superclass Osteichthyes (bony fish true: cover nearly all important fish present)
          o Class Actinopterygii (fan-finned fishes)
          o Class Sarcopterygii (fleshy fins of fish / lobe finned fish)
                + Subclass Coelacanthimorpha (coelacanth)
                + Subclass Dipnoi (lung fishes)
Fish Ecology Fish can be found in almost all the "puddle" of water that are large both freshwater, brackish water or salt water at varying depths, from near surface to several thousand meters below the surface. However, hyper-saline lakes like the Great Salt Lake do not support fish. There are several species of fish cultivated for maintained to be exhibited in the aquarium. Fish are an important food source. Other aquatic animals, such as molluscs and crustaceans also sometimes regarded as a fish when used as a food source. Catch fish for food in small quantities or sports are often referred to as fishing. Results of fishing the world each year approximately 100 million tons. Overfishing is a term in English to explain the overfishing. This phenomenon is a threat to various species of fish. On May 15, 2003, the journal Nature reported that all species of large marine fish have been caught over the systematic until the number is less than 10% of existing total in 1950. The author article in the journal suggests a drastic reduction in fishing and marine habitat reservations worldwide. Footnotes

   1. ^ Some tuna species to maintain body temperature, so it can not always be considered poikilotermik. Giant white sharks (Great White Shark) is the only fish that really endothermic (warm blooded).

 vertebrate poikilotermik Vertebrates are subfilum of Chordata, include all animals that have a backbone composed of vertebrae. Vertebrata is the largest subfilum of Chordata. Vertebrates can be incorporated into all kinds of fish (except the ghostly, eel Jeung, "marine leech," or Hagfish), amphibians, reptiles, birds, and mammals. Except for the types of fish, vertebrates known to possess two pairs of legs. Vertebrates have a lot of the muscular system consists of paired masses, as well as central nervous system which is usually located in the spine. System respiration using gills or lungs. Table of contents [Hide]

    * 1 Classification
    * 2 External links
    * 3 Footnotes
    * 4 See also
[Edit] Classification Classification according to Janvier (1981, 1997), Shu et al. (2003), and Benton (2004). [1] Note that in it does not include ghostly, a type of sea fish but has no true vertebrae, so that not all fish are vertebrates. Signs "†" means "already extinct".

    * Subfilum Vertebrata
          o (no status) Hyperoartia (lampreys, including vertebrates not berahang)
          o Class † Conodonta
                + Subclass Pteraspidomorphi †
          o Class Thelodonti †
          o Class Anaspida †
          o Class Galeaspida †
          o Class Pituriaspida †
          o Class Osteostraci †
          o Infrafilum Gnathostomata (vertebrates berahang)

                * Class Placodermi (shield-headed fish from the Paleozoik) †
                * Class Chondrichthyes (cartilaginous fish: sharks and rays)
                * Class Acanthodii (spiny sharks from the Paleozoik) †

            * Superclass Osteichthyes (bony fish true: cover nearly all important fish known to man)

                * Class Actinopterygii (fan-finned fishes)
                * Class Sarcopterygii (lobe finned fish / fin fleshy)

                    * Subclass Coelacanthimorpha (coelacanth)
                    * Subclass Dipnoi (lung fishes)
                    * Subclass Tetrapodomorpha (ancestor of all tetrapods)

            * Superclass tetrapods (vertebrates bertungkai four)

                    * Class Amphibians

                * Series amniotic (animal beramnion)

                    * Class Sauropsida (reptiles and birds)

                        * Class Aves (birds)

                    * Class Synapsida (reptile-like mammal)

                        * Class Mammalia (mammals)
External links

    * Tree of Life
    * Vertebrate Zoology

 Footnotes ^ Benton, Michael J. (1 November 2004). Vertebrate Palaeontology (Third Edition ed.) Blackwell Publishing. pp. 455 pp .. ISBN 0632056371/978-0632056378. http://palaeo.gly.bris.ac.uk/benton/vertclass.html.