Elasmobranchii: Perbedaan antara revisi

|quote = [[File:Cetorhinus maximus by greg skomal.JPG|220px|center]] Elasmobranch tidak mempunyai [[swim bladder]], dan menjaga keterapungan dengan minyak yang disimpan di hatinya. Beberapa hiu laut dalam diburu nelayan untuk [[Minyak hati hiu|minyak hiu]], termasuk [[Hiu sekolah]], [[Hiu gulper]] dan [[Hiu raksasa]] ''(pictured)''.<ref name=Vannuccini2002>Vannuccini, Stefania (2002) [http://www.fao.org/docrep/005/x3690e/x3690e0r.htm Shark liver oil products] {{Webarchive|url=https://web.archive.org/web/20130626203527/http://www.fao.org/docrep/005/x3690e/x3690e0r.htm |date=2013-06-26 }} In: ''Shark Utilization, Marketing and Trade'', Fisheries Technical paper 389, FAO, Rome. {{ISBN|92-5-104361-2}}.</ref> tiga spesies ini digolongkan oleh [[IUCN]] sebagai [[vulnerable species|vulnerable]] karena pemancingan berlebihan ( [[overfishing]]).<ref name="iucn1">{{Cite iucn | author = Fowler, S.L. | title = ''Cetorhinus maximus'' | volume = 2005 | page = e.T4292A10763893 | date = 2005 | doi = 10.2305/IUCN.UK.2005.RLTS.T4292A10763893.en }}</ref><ref name="iucn2">{{cite iucn |url=https://www.iucnredlist.org/details/39352/0 |title=Galeorhinus galeus (School shark) |date=2005-06-17 |accessdate=2013-03-26 }}{{Dead link|date=December 2019 |bot=InternetArchiveBot |fix-attempted=yes }}</ref><ref name="iucn3">{{cite iucn|author=Guallart|display-authors=etal|year=2006|url=https://www.iucnredlist.org/details/39325/0|title=''Centrophorus granulosus''|access-date=11 May 2006|ref=harv}}</ref>

|quote = From a practical point of view the life-history pattern of elasmobranchs makes this group of animals extremely susceptible to over fishing. It is no coincidence that the commercially exploited marine turtles and baleen whales, which have life-history patterns similar to the sharks, are also in trouble.<ref name=Hoenig1990>Hoenig, J.M. and Gruber, S.H. (1990) [http://spo.nwr.noaa.gov/tr90opt.pdf "Life-history patterns in the elasmobranchs: implications for fisheries management"] {{Webarchive|url=https://web.archive.org/web/20130218135249/http://spo.nwr.noaa.gov/tr90opt.pdf |date=2013-02-18 }} In: ''Elasmobranchs as living resources: advances in the biology, ecology, systematics and the status of the fisheries'', eds. J. H. L. Pratt, S. H. Gruber and T. Taniuchi, US Department of Commerce, NOAA technical report NMFS 90, pp.1–16.</ref>