Editing Fish locomotion (section)

==== Thunniform ====
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[[File:Bluefin-big.jpg|thumb|Tunas such as the [[bluefin tuna (disambiguation)|bluefin]] swim fast with their large crescent-shaped tails.]]

The thunniform group contains high-speed long-distance swimmers, and is characteristic of [[tuna]]s<ref name=Hawkins>{{cite journal | last1 = Hawkins | first1 = JD | last2 = Sepulveda | first2 = CA | last3 = Graham | first3 = JB | last4 = Dickson | first4 = KA | year = 2003 | title = Swimming performance studies on the eastern Pacific bonito ''Sarda chiliensis'', a close relative of the tunas (family Scombridae) II. Kinematics | journal = The Journal of Experimental Biology | volume = 206 | issue = 16| pages = 2749–2758 | doi = 10.1242/jeb.00496 | pmid = 12847120 | doi-access = free }}</ref> and is also found in several [[Lamnidae|lamnid sharks]].<ref>{{cite book | first = A. Peter | last = Klimley | title = The Biology of Sharks, Skates, and Rays | publisher = University of Chicago Press | date = 2013 | isbn = 978-0-226-44249-5}}</ref> Here, virtually all the sideways movement is in the tail and the region connecting the main body to the tail (the peduncle). The tail itself tends to be large and crescent shaped.<ref name=Breder/>