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Diseases of Aquatic Organisms

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DAO 51:101-106 (2002)  -  doi:10.3354/dao051101

Clinical efficacy of teflubenzuron (Calicide®) for the treatment of Lepeophtheirus salmonis infestations of farmed Atlantic salmon Salmo salar at low water temperatures

G. Ritchie1,*, S. S. Rønsberg1, K. A. Hoff1, E. J. Branson2

1Nutreco Aquaculture Research Centre, Sjøhagen 3, 4016 Stavanger, Norway
2Red House Farm, Llanvihangel, Monmouth, Gwent NP25 5HL, United Kingdom

ABSTRACT: The efficacy of teflubenzuron (Calicide®) for the treatment of farmed Atlantic salmon Salmo salar L. infested with sea lice Lepeophtheirus salmonis (Krøyer, 1838), was investigated at low water temperatures in 2 commercial salmon farms. Calicide®, coated on commercial feed pellets, was administered orally at 10 mg kg-1 d-1 for 7 consecutive days. Fish were randomly sampled and lice numbers recorded from both treated and control groups on 3 or 4 sampling occasions post-medication. Statistically significant reductions in the number of L. salmonis per fish were recorded. Maximum efficacy was observed toward chalimus and preadult stages of L. salmonis, and was achieved approximately 26 d post-medication. No adverse drug reactions or palatability problems were associated with the treatments.

KEY WORDS: Sea lice · Lepeophtheirus salmonis · Efficacy · Teflubenzuron

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