It works! Lumpfish can significantly lower sea lice infestation in large-scale salmon farming
| Autor: | Tonje Cecilie Urskog, Thor Arne Hangstad, Thor Magne Jonassen, Bjørn Mikalsen, Ane V. Nytrø, Albert Kjartan Dagbjartarson Imsland, Tor Anders Elvegård, Patrick Reynolds, Anna Hanssen |
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| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
Atlantic salmon Biological delousing QH301-705.5 Science High density medicine.disease_cause 01 natural sciences General Biochemistry Genetics and Molecular Biology Animal science Grazing Infestation medicine Biology (General) biology Adult female 010604 marine biology & hydrobiology 04 agricultural and veterinary sciences biology.organism_classification Lumpfish Lepeophtheirus Caligus elongatus Salmon farming 040102 fisheries 0401 agriculture forestry and fisheries Sea lice General Agricultural and Biological Sciences Research Article |
| Zdroj: | Biology Open, Vol 7, Iss 9 (2018) Biology Open |
| ISSN: | 2046-6390 |
| Popis: | To assess the efficacy of lumpfish grazing on attached sea lice on Atlantic salmon, six large-scale sea cages, (130 m circumference, 37,688 m3 volume) each stocked with approximately 200,000 salmon 0+ smolts, were stocked with a 4, 6 and 8% density (8000, 12,000 and 16,000, respectively) of lumpfish. The sea cages without lumpfish acted as controls. Sea lice infestation levels on the salmon were monitored weekly and bi-weekly from 6 October to 17 May the subsequent year. Mortality of the lumpfish rose with decreasing sea temperatures to around 0.8% week−1 and did not vary between the lumpfish groups. There were clear signs of lumpfish grazing on sea lice, with significantly lower average levels of chalimus, pre-adult and adult female Lepeophtheirus salmonis and Caligus elongatus sea lice per salmon. Lumpfish in the high density (8%) group reduced the mature female L. salmonis to levels equal to or lower than the counts recorded prior to the start of the study. Overall, the present results indicate that lumpfish are a suitable cold-water option for biological delousing of Atlantic salmon in large-scale production conditions. Summary: Lumpfish are effective cleaner fish for biological delousing and can significantly lower average levels of pre-adult and female Lepeophtheirus salmonis and Caligus elongatus sea lice on Atlantic salmon. |
| Databáze: | OpenAIRE |
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