Journal article

Sterilization of sea lice eggs with ultraviolet C light: towards a new preventative technique for aquaculture

Luke T Barrett, Cassandra G Pert, Samantha Bui, Frode Oppedal, Tim Dempster

PEST MANAGEMENT SCIENCE | JOHN WILEY & SONS LTD | Published : 2019

Abstract

BACKGROUND: Sea lice infestations on Atlantic salmon (Salmo salar) farms are a considerable burden on the industry and put wild salmonid populations at risk. Frequent delousing treatments are necessary to keep lice densities below allowable limits, but currently viable treatments have drawbacks in terms of financial cost, animal welfare, or environmental impacts. We tested if 254 nm ultraviolet C light (UVC) could function as a new preventative method to suppress reproduction of salmon lice (Lepeophtheirus salmonis) by sterilizing fertilized eggs. We exposed salmon lice eggstrings to a range of UVC intensities and durations to identify effective doses. RESULTS: A cumulative dose of 0.008 J c..

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Grants

Awarded by Norwegian Seafood Research Fund (FHF project)


Funding Acknowledgements

This study was funded by the Norwegian Seafood Research Fund (FHF project: 901460). We thank Kjell Maroni (FHF), Geir Magne Knutsen (Bremnes Seashore) and Solveig Willis (Salmon Group, now Pixelwerk) for discussions relating to potential industrial applications. We thank Sinclair Park (Planet Lighting; ) for discussion and for providing the UVC lamps and Tone Vagseth and Kathy Overton (IMR, Matre) for technical assistance. Comments from two anonymous reviewers improved the quality of the manuscript.