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From the mid\u20101990s the organophosphates dichlorvos and azamethiphos were seriously compromised by the development of resistance. AChE insensitive to organophosphate chemotherapeutants has been identified as a major resistance mechanism in numerous arthropod species, and in this study, target\u2010site resistance was confirmed in the crustacean\n                    <jats:italic>Lepeophtheirus salmonis<\/jats:italic>\n                    Kr\u00f8yer isolated from several fish\u2010farming areas in Norway and Canada. A bimolecular rate assay demonstrated the presence of two AChE enzymes with different sensitivities towards azamethiphos, one that was rapidly inactivated and one that was very slowly inactivated. To our knowledge this is the first report of target\u2010site resistance towards organophosphates in a third class of arthropods, the Crustacea. Copyright \u00a9 2004 Society of Chemical Industry\n                  <\/jats:p>","DOI":"10.1002\/ps.932","type":"journal-article","created":{"date-parts":[[2004,8,18]],"date-time":"2004-08-18T13:34:53Z","timestamp":1092836093000},"page":"1163-1170","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":70,"title":["Evidence for occurrence of an organophosphate\u2010resistant type of acetylcholinesterase in strains of sea lice (\n                    <i>Lepeophtheirus salmonis<\/i>\n                    Kr\u00f8yer)"],"prefix":"10.1002","volume":"60","author":[{"given":"Anders","family":"Fallang","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jennifer 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