Sea lice infestations on juvenile chum and pink salmon in the Broughton Archipelago, Canada, from 2003 to 2012

Thitiwan Patanasatienkul, Javier Sanchez, Erin E. Rees, Martin Krkošek, Simon R.M. Jones, Crawford W. Revie

Research output: Contribution to journalArticle

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Abstract

Juvenile pink salmon Oncorhynchus gorbuscha and chum salmon O. keta were sampled by beach or purse seine to assess levels of sea lice infestation in the Knight Inlet and Broughton Archipelago regions of coastal British Columbia, Canada, during the months of March to July from 2003 to 2012. Beach seine data were analyzed for sea lice infestation that was de - scribed in terms of prevalence, abundance, intensity, and intensity per unit length. The median annual prevalence for chum was 30%, ranging from 14% (in 2008 and 2009) to 73% (in 2004), while for pink salmon, the median was 27% and ranged from 10% (in 2011) to 68% (in 2004). Annual abundance varied from 0.2 to 5 sea lice per fish with a median of 0.47 for chum and from 0.1 to 3 lice (median 0.42) for pink salmon. Annual infestation followed broadly similar trends for both chum and pink salmon. However, the abundance and intensity of Lepeophtheirus salmonis and Caligus clemensi, the 2 main sea lice species of interest, were significantly greater on chum than on pink salmon in around half of the years studied. Logistic regression with random effect was used to model prevalence of sea lice infestation for the combined beach and purse seine data. The model suggested inter-annual variation as well as a spatial clustering effect on the prevalence of sea lice infestation in both chum and pink salmon. Fish length had an effect on prevalence, although the nature of this effect differed according to host species.

Original languageEnglish
Pages (from-to)149-161
Number of pages13
JournalDiseases of Aquatic Organisms
Volume105
Issue number2
DOIs
Publication statusPublished - 22 Jul 2013

Fingerprint

lice infestations
Caligidae
Oncorhynchus gorbuscha
Oncorhynchus keta
louse
Beaches
archipelago
Annual
Canada
Fish
beaches
beach
Logistics
Spatial Clustering
Caligus clemensi
Logistic Regression
Random Effects
Lepeophtheirus salmonis
lice
fish

Keywords

  • Broughton Archipelago
  • Caligus clemensi
  • epidemiology
  • Lepeophtheirus salmonis
  • Oncorhynchus gorbuscha
  • Oncorhynchus keta
  • sea lice

Cite this

Patanasatienkul, Thitiwan ; Sanchez, Javier ; Rees, Erin E. ; Krkošek, Martin ; Jones, Simon R.M. ; Revie, Crawford W. / Sea lice infestations on juvenile chum and pink salmon in the Broughton Archipelago, Canada, from 2003 to 2012. In: Diseases of Aquatic Organisms. 2013 ; Vol. 105, No. 2. pp. 149-161.
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abstract = "Juvenile pink salmon Oncorhynchus gorbuscha and chum salmon O. keta were sampled by beach or purse seine to assess levels of sea lice infestation in the Knight Inlet and Broughton Archipelago regions of coastal British Columbia, Canada, during the months of March to July from 2003 to 2012. Beach seine data were analyzed for sea lice infestation that was de - scribed in terms of prevalence, abundance, intensity, and intensity per unit length. The median annual prevalence for chum was 30{\%}, ranging from 14{\%} (in 2008 and 2009) to 73{\%} (in 2004), while for pink salmon, the median was 27{\%} and ranged from 10{\%} (in 2011) to 68{\%} (in 2004). Annual abundance varied from 0.2 to 5 sea lice per fish with a median of 0.47 for chum and from 0.1 to 3 lice (median 0.42) for pink salmon. Annual infestation followed broadly similar trends for both chum and pink salmon. However, the abundance and intensity of Lepeophtheirus salmonis and Caligus clemensi, the 2 main sea lice species of interest, were significantly greater on chum than on pink salmon in around half of the years studied. Logistic regression with random effect was used to model prevalence of sea lice infestation for the combined beach and purse seine data. The model suggested inter-annual variation as well as a spatial clustering effect on the prevalence of sea lice infestation in both chum and pink salmon. Fish length had an effect on prevalence, although the nature of this effect differed according to host species.",
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Sea lice infestations on juvenile chum and pink salmon in the Broughton Archipelago, Canada, from 2003 to 2012. / Patanasatienkul, Thitiwan; Sanchez, Javier; Rees, Erin E.; Krkošek, Martin; Jones, Simon R.M.; Revie, Crawford W.

In: Diseases of Aquatic Organisms, Vol. 105, No. 2, 22.07.2013, p. 149-161.

Research output: Contribution to journalArticle

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