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Do not leave empty sections. / Do not lead by describing the subject as a word/term. See: "Wikipedia: Wikipedia is not a Dictionary" on Wikipedia. / Do not use invisible comments for casual remarks to fellow editors. / Appearances section is for confirmed appearances, not a list to ask editors to search through every AC media. / Images should be organized as a table later. / "Fish" is a general noun & should not be capitalized. Please proofread grammar & spelling if chain-editing.
imported>Sol Pacificus
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{{Imageneed}}
{{Imageneed}}
[[File:ACBF Underwater Ruin.jpg|thumb|250px|Fish swimming around underwater.]]
[[File:ACBF Underwater Ruin.jpg|thumb|250px|Fish swimming around underwater.]]
'''Fish''' are aquatic vertebrate animals<ref name="Levinton 2014">Levinton, Jeffrey S. (2014) "Marine Vertebrates and Other Nekton". ''Marine Biology: Function, Biodiversity, Ecology''. 4th ed. Oxford: Oxford University Press, pp. 162–197.</ref><ref name="Castro & Huber 2013">Castro, Peter and Huber, Michael. (2013) "Marine Fishes". ''Marine Biology''. 9th ed. New York: McGraw-Hill, pp. 150–176.</ref> commonly defined by the presence of a {{wiki|craniate|cranium}},<ref name="Merriam-Webster">"[https://www.merriam-webster.com/dictionary/fish Fish]". ''Merriam-Webster.com Dictionary''. Merriam-Webster, Inc. Accessed 18 January 2013.</ref><ref name="UC Berkeley">"[https://evolution.berkeley.edu/fisheye-view-tree-of-life/what-is-a-fish/ A Fisheye View of the Tree of Life – What is a fish?]". ''Understanding Evolution''. University of California Museum of Paleontology. Accessed 18 January 2023.</ref> fins for locomotion in place of limbs,<ref name="Levinton 2014" /><ref name="UH Mānoa">"What is a Fish?". ''Exploring Our Fluid Earth''. University of Hawaii at Mānoa. Accessed 18 January 2023.</ref> and {{wiki|gill}}s to breathe underwater.<ref name="UH Mānoa" />  
'''Fish''' are aquatic vertebrate animals<ref name="Levinton 2014">Levinton, Jeffrey S. (2014) "Marine Vertebrates and Other Nekton". ''Marine Biology: Function, Biodiversity, Ecology''. 4th ed. Oxford: Oxford University Press, pp. 162–197.</ref><ref name="Castro & Huber 2013">Castro, Peter and Huber, Michael. (2013) "Marine Fishes". ''Marine Biology''. 9th ed. New York: McGraw-Hill, pp. 150–176.</ref> commonly defined by the presence of a {{wiki|craniate|cranium}},<ref name="Merriam-Webster">"[https://www.merriam-webster.com/dictionary/fish Fish]". ''Merriam-Webster.com Dictionary''. Merriam-Webster, Inc. Accessed 18 January 2013.</ref><ref name="UC Berkeley">"[https://evolution.berkeley.edu/fisheye-view-tree-of-life/what-is-a-fish/ A Fisheye View of the Tree of Life – What is a fish?]". ''Understanding Evolution''. University of California Museum of Paleontology. Accessed 18 January 2023.</ref> fins for locomotion in place of limbs,<ref name="Levinton 2014" /><ref name="UH Mānoa">"[https://manoa.hawaii.edu/exploringourfluidearth/biological/fish/what-fish What is a Fish?]". ''Exploring Our Fluid Earth''. University of Hawaii at Mānoa. Accessed 18 January 2023.</ref> and {{wiki|gill}}s to breathe underwater.<ref name="UH Mānoa" />


Of all vertebrates, they are the oldest, most structurally simple, and most wide-ranging in terms of species,<ref name="Castro & Huber 2013" /> with 24,000 to at least 30,000 known to [[human]]s.<ref name="Castro & Huber 2013" /><ref name="Levinton 2014" /> Because of their ubiquity to marine ecosystems,<ref name="Levinton 2014" /> they are the most economically significant aquatic life-form and are a vital food source for millions of people around the [[Earth|world]].<ref name="Castro & Huber 2013" /> Despite challenges to classifying such a diverse group,<ref name="Castro & Huber 2013" /> they are traditionally divided into {{wiki|Chondrichthyes|cartilaginous fishes}}, which have skeletons made of cartilage;<ref name="Levinton 2014" /><ref name="Castro & Huber 2013" /> {{wiki|Osteichthyes|bony fishes}}, which have true bony skeletons;<ref name="Levinton 2014" /><ref name="Castro & Huber 2013" /> and {{wiki|Agnatha|jawless fishes}}, which are the most primitive of fishes but are rejected as vertebrates by some scientists.<ref name="Castro & Huber 2013" /><ref name="UC Berkeley" /> [[Shark]]s are a prominent group of cartilaginous fishes.<ref name="Castro & Huber 2013" />
Of all vertebrates, they are the oldest, most structurally simple, and most wide-ranging in terms of species,<ref name="Castro & Huber 2013" /> with 24,000 to at least 30,000 known to [[human]]s.<ref name="Levinton 2014" /><ref name="Castro & Huber 2013" /> Because of their ubiquity to marine ecosystems,<ref name="Levinton 2014" /> they are the most economically significant aquatic life-form and are a vital food source for millions of people around the [[Earth|world]].<ref name="Castro & Huber 2013" /> Despite challenges to classifying such a diverse group,<ref name="Castro & Huber 2013" /> they are traditionally divided into {{wiki|Chondrichthyes|cartilaginous fishes}}, which have skeletons made of cartilage;<ref name="Levinton 2014" /><ref name="Castro & Huber 2013" /> {{wiki|Osteichthyes|bony fishes}}, which have true bony skeletons;<ref name="Levinton 2014" /><ref name="Castro & Huber 2013" /> and {{wiki|Agnatha|jawless fishes}}, which are the most primitive of fishes but are rejected as vertebrates by some scientists.<ref name="Castro & Huber 2013" /><ref name="UC Berkeley" /> [[Shark]]s are a prominent group of cartilaginous fishes.<ref name="Castro & Huber 2013" />


==Cartilaginous fishes==
==Cartilaginous fishes==

Revision as of 05:35, 19 January 2023

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Fish swimming around underwater.

Fish are aquatic vertebrate animals[1][2] commonly defined by the presence of a cranium,[3][4] fins for locomotion in place of limbs,[1][5] and gills to breathe underwater.[5]

Of all vertebrates, they are the oldest, most structurally simple, and most wide-ranging in terms of species,[2] with 24,000 to at least 30,000 known to humans.[1][2] Because of their ubiquity to marine ecosystems,[1] they are the most economically significant aquatic life-form and are a vital food source for millions of people around the world.[2] Despite challenges to classifying such a diverse group,[2] they are traditionally divided into cartilaginous fishes, which have skeletons made of cartilage;[1][2] bony fishes, which have true bony skeletons;[1][2] and jawless fishes, which are the most primitive of fishes but are rejected as vertebrates by some scientists.[2][4] Sharks are a prominent group of cartilaginous fishes.[2]

Cartilaginous fishes

Bony fishes

Appearances

References

  1. 1.0 1.1 1.2 1.3 1.4 1.5 Levinton, Jeffrey S. (2014) "Marine Vertebrates and Other Nekton". Marine Biology: Function, Biodiversity, Ecology. 4th ed. Oxford: Oxford University Press, pp. 162–197.
  2. 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 Castro, Peter and Huber, Michael. (2013) "Marine Fishes". Marine Biology. 9th ed. New York: McGraw-Hill, pp. 150–176.
  3. "Fish". Merriam-Webster.com Dictionary. Merriam-Webster, Inc. Accessed 18 January 2013.
  4. 4.0 4.1 "A Fisheye View of the Tree of Life – What is a fish?". Understanding Evolution. University of California Museum of Paleontology. Accessed 18 January 2023.
  5. 5.0 5.1 "What is a Fish?". Exploring Our Fluid Earth. University of Hawaii at Mānoa. Accessed 18 January 2023.