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Swim bladder
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==Human uses== In the East Asian culinary sphere, the swim bladders of certain large fishes are considered a food delicacy. In Chinese cuisine, they are known as ''fish maw'', θ±θ /ι±Όι³,<ref>Teresa M. (2009) [https://books.google.com/books?id=D68I9MshwM4C&pg=PA70 ''A Tradition of Soup: Flavors from China's Pearl River Delta''] Page 70, North Atlantic Books. {{ISBN|9781556437656}}.</ref> and are served in soups or stews. The vanity price of a vanishing kind of maw is behind the imminent extinction of the [[vaquita]], the world's smallest porpoise species. Found only in Mexico's [[Gulf of California]], the once numerous vaquita are now critically endangered.<ref>{{cite iucn |author=Rojas-Bracho, L. |author2=Taylor, B.L. |author3=Jaramillo-Legorreta, A. |year=2022 |title=''Phocoena sinus'' |volume=2022 |page=e.T17028A214541137 |doi=10.2305/IUCN.UK.2022-1.RLTS.T17028A214541137.en |access-date=14 October 2022}}</ref> Vaquita die in [[gillnets]]<ref>{{Cite news|url=http://www.iucn-csg.org/index.php/2016/06/06/extinction-is-imminent-new-report-from-vaquita-recovery-team-cirva-is-released/|title='Extinction Is Imminent': New report from Vaquita Recovery Team (CIRVA) is released|date=2016-06-06|newspaper=IUCN SSC - Cetacean Specialist Group|language=en-US|access-date=2017-01-25|archive-date=2019-01-03|archive-url=https://web.archive.org/web/20190103060447/http://www.iucn-csg.org/index.php/2016/06/06/extinction-is-imminent-new-report-from-vaquita-recovery-team-cirva-is-released/|url-status=dead}}</ref> set to catch [[totoaba]] (the world's largest [[drum fish]]). Totoaba are being hunted to extinction for its maw, which can sell for as much $10,000 per kilogram. Swim bladders are also used in the food industry as a source of [[collagen]]. They can be made into a strong, water-resistant glue, or used to make [[isinglass]] for the clarification of [[beer]].<ref>[[Bridge, T. W.]] (1905) [https://onlinelibrary.wiley.com/doi/pdf/10.1002/j.2050-0416.1905.tb02147.x] "The Natural History of Isinglass"</ref> In earlier times, they were used to make [[condom]]s.<ref>{{cite journal | last1 = Huxley | first1 = Julian | author-link = Julian Huxley | year = 1957 | title = Material of early contraceptive sheaths | journal = British Medical Journal | volume = 1 | issue = 5018| pages = 581β582 | doi = 10.1136/bmj.1.5018.581-b | pmc = 1974678 }}</ref>
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