Editing Porpoise (section)

====Fishing====
{{Main|Cetacean bycatch}}
[[File:Vaquita2 Olson NOAA.jpg|thumb|A [[vaquita]] swimming in the [[Gulf of California]].]]
Porpoises are highly affected by [[bycatch]]. Many porpoises, mainly the [[vaquita]], are subject to great mortality due to [[gillnetting]]. Although it is the world's most endangered marine cetacean, the vaquita continues to be caught in small-mesh gillnet fisheries throughout much of its range. Incidental mortality caused by the fleet of El Golfo de Santa Clara was estimated to be at around 39 vaquitas per year, which is over 17% of the population size.<ref>{{cite journal|last1=D'agrosa|first1=C.|last2=Lennert-Cody|first2=C. E.|last3=Vidal|first3=O.|year=2000|title=Vaquita Bycatch in Mexico's Artisanal Gillnet Fisheries: Driving a Small Population to Extinction|journal=Conservation Biology|volume=14|issue=4|doi=10.1046/j.1523-1739.2000.98191.x|pages=1110–1119|bibcode=2000ConBi..14.1110D |s2cid=44057831}}</ref> Harbour porpoises also suffer drowning by gillnetting, but on a less threatening scale due to their high population; their mortality rate per year increases a mere 5% due to this.<ref>{{cite journal|url=https://www.umb.edu/editor_uploads/images/Caswell_etal_EcolAppl1998.pdf|first1=Hal|last1=Caswell|first2=Solange|last2=Brault|first3=Andrew|last3=Read|first4=Tim|last4=Smith|title=Harbor Porpoise and Fisheries: an Uncertainty Analysis of Incidental Mortality|journal=Ecological Applications|volume=8|issue=4|year=1998|access-date=30 October 2015|pages=1226–1238|doi=10.1890/1051-0761(1998)008[1226:hpafau]2.0.co;2|archive-date=8 December 2015|archive-url=https://web.archive.org/web/20151208132734/https://www.umb.edu/editor_uploads/images/Caswell_etal_EcolAppl1998.pdf|url-status=dead}}</ref>

The fishing market, historically has always had a porpoise bycatch. Today, the [[Marine Mammal Protection Act of 1972]] has enforced the use of safer fishing equipment to reduce bycatch.<ref>{{cite newsgroup|title=America's Favorite Fish Tainted by Porpoise Deaths|last=Croft|first=Chris|url=https://www.latimes.com/archives/la-xpm-1988-04-17-op-1956-story.html|access-date=30 October 2015}}</ref>