期刊
PREVENTIVE VETERINARY MEDICINE
卷 140, 期 -, 页码 97-105出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.prevetmed.2017.03.002
关键词
Parasite control; Aquaculture; Commercial sea-cage; Salmo solar; Lepeophthelms salmonis; Neoparamoeba perurans
资金
- Norwegian Research Council [CREATE 841005]
- VRI fund
- Norwegian Seafood Fund [900884]
Diverse chemical-free parasite controls are gaining status in Atlantic salmon sea-cage farming. Yet, the intricacies of their use at commercial scale, including effects on co-occurring parasites, are seldom reported. A new salmon lice prevention method involves installing a deep net roof and 'snorkel' lice barrier in cages to shelter salmon from free-living infective larvae which concentrate at shallow depths, and allows salmon to jump and re-inflate their buoyancy-regulating swim bladder by swallowing air. We document use of snorkel cages (10 m deep barrier) in commercial farms, where their effects on salmon lice levels, amoebic gill disease (AGD)-related gill scores, the cage environment, fish welfare and farm management practices were compared to standard cages. During an autumn winter study involving only snorkel cages, high AGD-related gill scores were observed to decline when freshwater was pumped into snorkels, creating a freshwater surface layer for salmon to enter for self-treatment. In a spring summer study incorporating snorkel and standard cages, snorkel cages were found to reduce new lice infestations by 84%. The deployment of snorkels and intermittent oxygen depletion detected within them in the spring summer study did not alter fish welfare parameters. Overall, the results suggest snorkel technology has a place in the toolkit of commercial salmon sea-cage farmers co-managing salmon lice and amoebic gill disease outbreaks two principal parasite issues facing the industry. (C) 2017 Elsevier B.V. All rights reserved.
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