Sea lice on wild juvenile Pacific salmon and farmed Atlantic salmon in the northernmost salmon farming region of British Columbia

Sonja M. Saksida, Larry Greba, Diane Morrison, Crawford W. Revie

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The Kitasoo/Xai'xais First Nation established a program to monitor sea lice levels on seaward migrating wild juvenile salmon in their traditional territory which contains the most northerly salmon farming region of British Columbia. A total of 12 locations were routinely sampled during the period between 2005 and 2008 to gain a better understanding of the levels and patterns of sea lice infestation on wild salmonids in the region. Over 5000 juvenile salmon were collected and examined for sea lice. Around 78% were identified as pink salmon, 18% were chum salmon and the remainder classified as 'other' salmon (coho and sockeye salmon). Two species of sea lice were observed: Lepeophtheirus salmonis and Caligus clemensi. Over 91% of all the juvenile salmon examined had no sea lice and there was no significant difference in L. salmonis prevalence levels among salmon species. However, chum salmon had significantly lower C. clemensi prevalence levels than either pink or 'other' salmon. There were significant annual and regional differences in L. salmonis prevalence on juvenile pink salmon; the lowest prevalence in all sampling zones occurring in 2008, while channels containing salmon farms consistently had higher levels than those without salmon farms. Mean prevalence of L. salmonis in the channels with salmon farms ranged from 2% to 9% which is lower than levels published for the same region in different years or for other areas without salmon farms. C. clemensi prevalence on wild pink salmon was associated with sampling zone and the size of pink salmon; larger juvenile fish were more likely to be infected than smaller fish. During the period of wild juvenile salmon migration, the mean abundance of motile stages of L. salmonis on farmed salmon ranged from 0.13 to 0.79 lice per fish but there were no significant differences among years. In comparison, C. clemensi abundance levels on farms were significantly higher in 2005. Factors contributing to variations in these observations are discussed.

LanguageEnglish
Pages193-198
Number of pages6
JournalAquaculture
Volume320
Issue number3-4
Early online date22 Jul 2011
DOIs
Publication statusPublished - 1 Nov 2011

Fingerprint

Caligidae
louse
British Columbia
Salmo salar
salmon
farming systems
farm
Caligus clemensi
Lepeophtheirus salmonis
Oncorhynchus gorbuscha
fish
farms
Oncorhynchus keta
sampling
sea
First Nations
lice infestations
Oncorhynchus nerka
Oncorhynchus kisutch
lice

Keywords

  • British Columbia
  • caligus clemensi
  • farmed salmon
  • juvenile Pacific salmon
  • lepeophtheirus salmonis
  • sea lice

Cite this

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title = "Sea lice on wild juvenile Pacific salmon and farmed Atlantic salmon in the northernmost salmon farming region of British Columbia",
abstract = "The Kitasoo/Xai'xais First Nation established a program to monitor sea lice levels on seaward migrating wild juvenile salmon in their traditional territory which contains the most northerly salmon farming region of British Columbia. A total of 12 locations were routinely sampled during the period between 2005 and 2008 to gain a better understanding of the levels and patterns of sea lice infestation on wild salmonids in the region. Over 5000 juvenile salmon were collected and examined for sea lice. Around 78{\%} were identified as pink salmon, 18{\%} were chum salmon and the remainder classified as 'other' salmon (coho and sockeye salmon). Two species of sea lice were observed: Lepeophtheirus salmonis and Caligus clemensi. Over 91{\%} of all the juvenile salmon examined had no sea lice and there was no significant difference in L. salmonis prevalence levels among salmon species. However, chum salmon had significantly lower C. clemensi prevalence levels than either pink or 'other' salmon. There were significant annual and regional differences in L. salmonis prevalence on juvenile pink salmon; the lowest prevalence in all sampling zones occurring in 2008, while channels containing salmon farms consistently had higher levels than those without salmon farms. Mean prevalence of L. salmonis in the channels with salmon farms ranged from 2{\%} to 9{\%} which is lower than levels published for the same region in different years or for other areas without salmon farms. C. clemensi prevalence on wild pink salmon was associated with sampling zone and the size of pink salmon; larger juvenile fish were more likely to be infected than smaller fish. During the period of wild juvenile salmon migration, the mean abundance of motile stages of L. salmonis on farmed salmon ranged from 0.13 to 0.79 lice per fish but there were no significant differences among years. In comparison, C. clemensi abundance levels on farms were significantly higher in 2005. Factors contributing to variations in these observations are discussed.",
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Sea lice on wild juvenile Pacific salmon and farmed Atlantic salmon in the northernmost salmon farming region of British Columbia. / Saksida, Sonja M.; Greba, Larry; Morrison, Diane; Revie, Crawford W.

In: Aquaculture, Vol. 320, No. 3-4, 01.11.2011, p. 193-198.

Research output: Contribution to journalArticle

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