Editing Fin (section)

==Ornamentation and other uses==
In biology, fins can have an adaptive significance as sexual ornaments. During courtship, the female [[cichlid]], ''[[Pelvicachromis taeniatus]]'', displays a large and visually arresting purple [[pelvic fin]]. "The researchers found that males clearly preferred females with a larger pelvic fin and that pelvic fins grew in a more disproportionate way than other fins on female fish."<ref>[https://www.sciencedaily.com/releases/2010/10/101007210540.htm Female fish flaunt fins to attract a mate] {{Webarchive|url=https://web.archive.org/web/20190520152144/https://www.sciencedaily.com/releases/2010/10/101007210540.htm |date=2019-05-20 }} ''ScienceDaily''. 8 October 2010.</ref><ref>{{cite journal | last1 = Baldauf | first1 = SA | last2 = Bakker | first2 = TCM | last3 = Herder | first3 = F | last4 = Kullmann | first4 = H | last5 = Thünken | first5 = T | year = 2010 | title = Male mate choice scales female ornament allometry in a cichlid fish | journal = BMC Evolutionary Biology | volume = 10 | issue = 1 | page = 301 | doi = 10.1186/1471-2148-10-301 | pmid = 20932273 | pmc = 2958921 | bibcode = 2010BMCEE..10..301B | doi-access = free }}</ref>

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| header            = Ornamentation
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| image1            = Pelvicachromis taeniatus.jpg
| width1            = 150
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| caption1          = During courtship, the female [[cichlid]], ''[[Pelvicachromis taeniatus]]'', displays her visually arresting purple [[pelvic fin]].
| image2            = Spinosaurus 2020 reconstruction.jpg
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| caption2          = ''[[Spinosaurus]]'' may have used its dorsal fin ([[Neural spine sail|sail]]) as a courtship display.<ref name=Stromer15>{{cite journal |last=Stromer |first=E. |author-link=Ernst Stromer |year=1915 |title=Ergebnisse der Forschungsreisen Prof. E. Stromers in den Wüsten Ägyptens. II. Wirbeltier-Reste der Baharije-Stufe (unterstes Cenoman). 3. Das Original des Theropoden ''Spinosaurus aegyptiacus'' nov. gen., nov. spec |journal=Abhandlungen der Königlich Bayerischen Akademie der Wissenschaften, Mathematisch-physikalische Klasse |volume=28 |issue=3 |pages=1–32 |language=de |url=http://www.megaupload.com/?d=3KCCC7LS }}{{dead link|date=September 2017 |bot=InternetArchiveBot |fix-attempted=yes }}</ref>{{rp|28}}
| image3            = Cadillac1001.jpg
| width3            = 160
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| caption3          = [[Car tail fin]]s in the 1950s were largely decorative.<ref>David, Dennis (2001) [https://books.google.com/books?id=VOi0Omb6newC&pg=PA6 ''Fifties Fins''] {{Webarchive|url=https://web.archive.org/web/20231216095826/https://books.google.com/books?id=VOi0Omb6newC&pg=PA6#v=onepage&q&f=false |date=2023-12-16 }} MotorBooks International. {{ISBN|9780760309612}}.</ref>
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Reshaping human feet with [[swim fin]]s, rather like the tail fin of a fish, add thrust and efficiency to the kicks of a [[Human swimming|swimmer]] or [[underwater diving|underwater diver]]<ref>{{cite journal |vauthors=Zamparo P, Pendergast DR, Termin A, Minetti AE|title=Economy and efficiency of swimming at the surface with fins of different size and stiffness |journal=Eur. J. Appl. Physiol. |volume=96 |issue=4 |pages=459–70 |date=March 2006 |pmid=16341874 |doi=10.1007/s00421-005-0075-7|s2cid=34505861 }}</ref><ref>{{cite journal |vauthors=Yamaguchi H, Shidara F, Naraki N, Mohri M |title=Maximum sustained fin-kick thrust in underwater swimming |journal=Undersea Hyperb Med |volume=22 |issue=3 |pages=241–8 |date=September 1995 |pmid=7580765 |url=http://archive.rubicon-foundation.org/2219 |access-date=2008-08-25 |archive-url=https://web.archive.org/web/20110811174931/http://archive.rubicon-foundation.org/2219 |archive-date=2011-08-11 |url-status=usurped }}</ref> [[Surfboard fin]]s provide [[surfer]]s with means to maneuver and control their boards. Contemporary surfboards often have a centre fin and two [[Camber (aerodynamics)|cambered]] side fins.<ref>Brandner PA and Walker GJ (2004) [http://eprints.utas.edu.au/6613/1/AFMC_Brandnerand_Walker_2004_F1.pdf ''Hydrodynamic Performance of a Surfboard Fin''] {{Webarchive|url=https://web.archive.org/web/20201030153346/https://eprints.utas.edu.au/6613/1/AFMC_Brandnerand_Walker_2004_F1.pdf |date=2020-10-30 }} 15th Australasian Fluid Mechanics Conference, Sydney.</ref>

The bodies of [[reef fish]]es are often shaped differently from [[Pelagic fish|open water fishes]]. Open water fishes are usually built for speed, streamlined like torpedoes to minimise friction as they move through the water. Reef fish operate in the relatively confined spaces and complex underwater landscapes of [[coral reef]]s. For this manoeuvrability is more important than straight line speed, so coral reef fish have developed bodies which optimize their ability to dart and change direction. They outwit predators by dodging into fissures in the reef or playing hide and seek around coral heads.<ref name=Alevizon>{{cite book|author=William S. Alevizon|title=Pisces Guide to Caribbean Reef Ecology|url=https://books.google.com/books?id=H9FcAAAAMAAJ|year=1993|publisher=Pisces Books|isbn=978-1-55992-077-3|access-date=2018-04-24|archive-date=2023-12-16|archive-url=https://web.archive.org/web/20231216095827/https://books.google.com/books?id=H9FcAAAAMAAJ|url-status=live}}</ref>

The pectoral and pelvic fins of many reef fish, such as [[butterflyfish]], [[damselfish]] and [[Pomacanthidae|angelfish]], have evolved so they can act as brakes and allow complex maneuvers.<ref name=FMNH>[http://www.flmnh.ufl.edu/fish/education/HowSwim/HowSwim.html Ichthyology] {{Webarchive|url=https://web.archive.org/web/20160105001306/http://www.flmnh.ufl.edu/fish/education/HowSwim/HowSwim.html |date=2016-01-05 }} ''Florida Museum of Natural History''. Retrieved 22 November 2012.</ref> Many reef fish, such as [[butterflyfish]], [[damselfish]] and [[Pomacanthidae|angelfish]], have evolved bodies which are deep and laterally compressed like a pancake, and will fit into fissures in rocks. Their pelvic and pectoral fins are designed differently, so they act together with the flattened body to optimise maneuverability.<ref name=Alevizon /> Some fishes, such as [[puffer fish]], [[filefish]] and [[trunkfish]], rely on pectoral fins for swimming and hardly use tail fins at all.<ref name=FMNH />

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| header            = Other uses
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| image1            = Jetfins reglables.jpg
| width1            = 92
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| caption1          = [[Swim fin]]s add thrust to the kicks of a human [[Human swimming|swimmer]].
| image2            = Rescue surfboard, Killahoey Strand - geograph.org.uk - 901180.jpg
| width2            = 100
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| caption2          = [[Surfboard fin]]s allow surfers to maneuver their boards.
| image3            = Shark finning icon.jpg
| width3            = 97
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| caption3          = In some Asian countries shark fins are a [[Shark finning|culinary delicacy]].<ref>{{cite journal | author = Vannuccini S | year = 1999 | title = Shark utilization, marketing and trade | journal = FAO Fisheries Technical Paper | volume = 389 | url = http://www.fao.org/DOCREP/005/X3690E/x3690e0p.htm | access-date = 2012-11-26 | archive-date = 2017-08-02 | archive-url = https://web.archive.org/web/20170802204244/http://www.fao.org/docrep/005/x3690e/x3690e0p.htm | url-status = dead }}</ref>
| image4            = Fernando Alonso won 2012 Malaysian GP.jpg
| width4            = 145
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| caption4          = In recent years, car fins have evolved into highly functional [[Spoiler (automotive)|spoilers]] and [[Wing (automotive)|wings]].<ref>Ridhwan CZ (2008) [http://umpir.ump.edu.my/581/1/Ridhwan_Che_Zake.pdf Aerodynamics of aftermarket rear spoiler] {{Webarchive|url=https://web.archive.org/web/20111111161147/http://umpir.ump.edu.my/581/1/Ridhwan_Che_Zake.pdf |date=2011-11-11 }} University Malaysia Pahang</ref>
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| image1            = Holacanthus ciliaris 1.jpg
| width1            = 138
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| caption1          = Many [[reef fish]] have pectoral and pelvic fins optimised for flattened bodies.<ref name=Alevizon />
| image2            = Antennarius striatus.jpg
| width2            = 137
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| caption2          = [[Frog fish]] use their pectoral and pelvic fins to walk along the ocean bottom.<ref>{{cite book |vauthors=Bertelsen E, Pietsch TW|year=1998|title=Encyclopedia of Fishes|publisher= Academic Press|location=San Diego|pages= 138–139|isbn= 978-0-12-547665-2}}</ref>
| image3            = Sailfin flyingfish.jpg
| width3            = 163
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| caption3          = [[Flying fish]] use enlarged pectoral fins to glide above the surface of the water.<ref>{{cite journal|last=Fish |first=FE |year=1990 |title=Wing design and scaling of flying fish with regard to flight performance |journal=[[Journal of Zoology]] |volume=221 |pages=391–403 |url=http://darwin.wcupa.edu/~biology/fish/pubs/pdf/1990JZWingdesign.pdf |doi=10.1111/j.1469-7998.1990.tb04009.x |issue=3 |url-status=dead |archive-url=https://web.archive.org/web/20131020095503/http://darwin.wcupa.edu/~biology/fish/pubs/pdf/1990JZWingdesign.pdf |archive-date=2013-10-20 }}</ref>
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