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Reduced sensitivity of the salmon louse, Lepeophtheirus salmonis , to the organophosphate dichlorvos
Author(s) -
JONES M. W.,
SOMMERVILLE C.,
WOOTTEN R.
Publication year - 1992
Publication title -
journal of fish diseases
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 85
eISSN - 1365-2761
pISSN - 0140-7775
DOI - 10.1111/j.1365-2761.1992.tb00654.x
Subject(s) - lepeophtheirus , dichlorvos , organophosphate , biology , fishery , sensitivity (control systems) , zoology , ecology , pesticide , fish <actinopterygii> , aquaculture , engineering , electronic engineering
. Anecdotal reports from the Scottish fish farming industry suggested a reduction in the sensitivity of salmon lice, Lepeophtheirus salmonis , to the organophosphate dichlorvos. In this study, pro‐adult and adult lice were collected from marine salmon sites showing a variety of ‘sensitivities’ to dichlorvos and subjected to dichlorvos exposure at a range of doses for a 48‐h period in vitro. From the lice mortalities, 24 and 48 h LC50 values were calculated, and using a ‘sensitive’ source of lice as a reference, resistance ratios calculated. The data generated suggests that L. salmonis from different geographic areas shows differences in sensitivity to dichlorvos. The implications for the salmon farming industry are discussed.