Salmon lice infestations on sea trout predicts infestations on migrating salmon post-smolts. (1st June 2017)
- Record Type:
- Journal Article
- Title:
- Salmon lice infestations on sea trout predicts infestations on migrating salmon post-smolts. (1st June 2017)
- Main Title:
- Salmon lice infestations on sea trout predicts infestations on migrating salmon post-smolts
- Authors:
- Vollset, Knut Wiik
Halttunen, Elina
Finstad, Bengt
Karlsen, Ørjan
Bjørn, Pål Arne
Dohoo, Ian - Editors:
- Gibbs, Mark
- Abstract:
- Abstract: Impacts of sea lice ( Lepeophtheirus salmonis or Caligus spp. ) on wild salmonids is currently one of the most important issues facing management of fish farms in salmon producing countries in the northern hemisphere. Surveillance of sea lice on wild Atlantic salmon ( Salmo salar ) is often hampered by the ability to catch enough migrating post-smolts. Therefore, sea lice abundance on anadromous trout ( Salmo trutta ) is often used to infer sea lice abundance on migrating salmon post-smolt. However, the assumption that there is a relationship between the abundance of lice on salmon and trout has never been tested. Here we use a dataset of sea lice on salmon post-smolt and sea trout that have been caught simultaneously in trawl hauls, to evaluate the correlation in abundance of sea lice between the two species using various statistical models. We demonstrate that trout generally has higher abundances of sea lice than salmon. Average lice per gram fish on sea trout (log transformed) predicted the abundance of lice on salmon best. Negative binomial models of lice counts were preferable to using trout lice counts as direct estimates of salmon lice abundance, and they had better predictive ability than logit models of high (vs. low) lice counts. Including the size of the salmon increased the predictive ability of the model, but these data are not generally available. The effect of salmon weight may have been a direct effect of body size, or an indirect effect of timeAbstract: Impacts of sea lice ( Lepeophtheirus salmonis or Caligus spp. ) on wild salmonids is currently one of the most important issues facing management of fish farms in salmon producing countries in the northern hemisphere. Surveillance of sea lice on wild Atlantic salmon ( Salmo salar ) is often hampered by the ability to catch enough migrating post-smolts. Therefore, sea lice abundance on anadromous trout ( Salmo trutta ) is often used to infer sea lice abundance on migrating salmon post-smolt. However, the assumption that there is a relationship between the abundance of lice on salmon and trout has never been tested. Here we use a dataset of sea lice on salmon post-smolt and sea trout that have been caught simultaneously in trawl hauls, to evaluate the correlation in abundance of sea lice between the two species using various statistical models. We demonstrate that trout generally has higher abundances of sea lice than salmon. Average lice per gram fish on sea trout (log transformed) predicted the abundance of lice on salmon best. Negative binomial models of lice counts were preferable to using trout lice counts as direct estimates of salmon lice abundance, and they had better predictive ability than logit models of high (vs. low) lice counts. Including the size of the salmon increased the predictive ability of the model, but these data are not generally available. The effect of salmon weight may have been a direct effect of body size, or an indirect effect of time spent in marine waters. Finally, we predict lower salmon lice counts on migrating salmon with our selected binomial model than with the current method of using trout lice counts as a direct estimator on salmon lice counts, and demonstrate that management advice would change considerably depending on the chosen method. … (more)
- Is Part Of:
- ICES journal of marine science. Volume 74:Number 9(2017)
- Journal:
- ICES journal of marine science
- Issue:
- Volume 74:Number 9(2017)
- Issue Display:
- Volume 74, Issue 9 (2017)
- Year:
- 2017
- Volume:
- 74
- Issue:
- 9
- Issue Sort Value:
- 2017-0074-0009-0000
- Page Start:
- 2354
- Page End:
- 2363
- Publication Date:
- 2017-06-01
- Subjects:
- aquaculture -- conservation -- fish farming -- Lepeophtheirus salmonis -- management -- parasite -- salmonids -- salmon lice -- Salmo salar
Ocean -- Periodicals
Fisheries -- Periodicals
Fishes -- Periodicals
Marine biology -- Bibliography -- Periodicals
551.4605 - Journal URLs:
- http://icesjms.oxfordjournals.org/ ↗
http://www.sciencedirect.com/science/journal/10543139 ↗
http://ukcatalogue.oup.com/ ↗ - DOI:
- 10.1093/icesjms/fsx090 ↗
- Languages:
- English
- ISSNs:
- 1054-3139
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 4361.491000
British Library DSC - BLDSS-3PM
British Library HMNTS - ELD Digital store - Ingest File:
- 16969.xml