Cristin-resultat-ID: 2071931
Sist endret: 19. desember 2023, 17:57
NVI-rapporteringsår: 2022
Resultat
Vitenskapelig artikkel
2022

Salmon lice (Lepeophtheirus salmonis) in the stomach contents of lumpfish (Cyclopterus lumpus) sampled from Norwegian fish farms: Relationship between lice grazing and operational conditions

Bidragsytere:
  • Solveig Engebretsen
  • Magne Tommy Aldrin
  • Lars Qviller
  • Leif Christian Stige
  • Trond Rafoss
  • Ole Roald Danielsen
  • mfl.

Tidsskrift

Aquaculture
ISSN 0044-8486
e-ISSN 1873-5622
NVI-nivå 2

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2022
Trykket: 2023
Volum: 563
Hefte: 2
Artikkelnummer: 738967
Open Access

Importkilder

Scopus-ID: 2-s2.0-85141466533

Beskrivelse Beskrivelse

Tittel

Salmon lice (Lepeophtheirus salmonis) in the stomach contents of lumpfish (Cyclopterus lumpus) sampled from Norwegian fish farms: Relationship between lice grazing and operational conditions

Sammendrag

Cleaner fish are commonly used as a control measure against salmon lice infestations in salmonid farms. Lumpfish (Cyclopterus lumpus) is the most common cleaner fish species used in Norwegian farms. However, little is known about how different operational, including environmental, conditions affect the salmon lice grazing efficacy by lumpfish. In this paper, we analyse salmon lice (Lepeophtheirus salmonis) in the stomach contents of a large sample of more than 20,000 lumpfish from 80 different Norwegian farms. We investigate the proportion of lumpfish with salmon lice and the mean number of salmon lice in the stomach contents of the lumpfish. We further explore how the salmon lice contents vary with different factors like lumpfish weight, weight of salmonids, salmon lice abundance in the cage, cloud cover, and sea temperature. We find that 3.1% of the 24,693 lumpfish contained salmon lice. Most of the lumpfish with salmon lice in their stomach contents contained few (one or two) lice, while there were a few lumpfish which contained many salmon lice. We find more salmon lice in the stomach contents with increasing abundance of salmon lice in the sea cage, lower weight of the salmonids, and in clear weather. Interestingly, for the relationship between lumpfish weight and salmon lice in the stomach contents, we find increased salmon lice grazing from ca. 5 g up to an optimal weight of ca. 40 g, and then a decrease from 40 g. Surprisingly, we find no relationship between sea temperature and salmon lice per lumpfish. We find more salmon lice in the stomach contents of the lumpfish with comparatively high condition. By studying the factors associated with most efficient salmon lice grazing, our paper contributes to understanding how different operational factors affect salmon lice grazing by lumpfish. For controllable factors, the results thus contribute to guiding the best practice for use of lumpfish as a salmon lice control measure.

Bidragsytere

Solveig Engebretsen

  • Tilknyttet:
    Forfatter
    ved Avdeling for statistisk analyse og maskinlæring for brukermotiverte anvendelser SAMBA ved Norsk Regnesentral

Magne Tommy Aldrin

  • Tilknyttet:
    Forfatter
    ved Avdeling for statistisk analyse og maskinlæring for brukermotiverte anvendelser SAMBA ved Norsk Regnesentral
Aktiv cristin-person

Lars Qviller

  • Tilknyttet:
    Forfatter
    ved Epidemiologi ved Veterinærinstituttet
Aktiv cristin-person

Leif Christian Stige

  • Tilknyttet:
    Forfatter
    ved Veterinærinstituttet

Trond Rafoss

  • Tilknyttet:
    Forfatter
    ved Institutt for naturvitenskapelige fag ved Universitetet i Agder
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