Effects of hydrogen peroxide, dichlorvos and cypermethrin on subsequent fecundity of sea lice, Lepeophtheirus salmonis, under fish farm conditions

J. P G Toovey, A. R. Lyndon

    Research output: Contribution to journalArticle

    14 Citations (Scopus)

    Abstract

    The effect was investigated of three topical bath treatments, namely, hydrogen peroxide, dichlorvos and cypermethrin, on the hatch and subsequent development of egg strings from salmon lice (Lepeophtheirus salmonis) which survived the treatments. All treatments significantly reduced the hatch compared to reference egg strings (9 weeks post treatment), although hatching was significantly higher after cypermethrin treatment than for the other two treatments. Subsequent development of the larvae to nauplius and copepodid stages was also significantly reduced by all treatments, the same differences between treatments being evident as seen for the total hatch. The proportion of opaque white egg strings after treatment was closely and negatively associated with the numbers of larvae hatching and developing to the nauplius stage.

    Original languageEnglish
    Pages (from-to)224-228
    Number of pages5
    JournalBulletin of the European Association of Fish Pathologists
    Volume20
    Issue number6
    Publication statusPublished - 2000

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