Pink salmon (Oncorhynchus gorbuscha) osmoregulatory development plays a key role in sea louse (Lepeophtheirus salmonis) tolerance

Sea lice ( Lepeophtheirus salmonis ) of fish-farm origin have been implicated in reducing populations of pink salmon ( Oncorhynchus gorbuscha ) in British Columbia’s Broughton Archipelago. Owing to the physically disruptive nature of louse attachment to fish skin in a hyperosmotic environment, we hy...

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Published in:Canadian journal of fisheries and aquatic sciences 2011-06, Vol.68 (6), p.1087-1096
Main Authors: SACKVILLE, M, TANG, S, NENDICK, L, FARRELL, A. P, BRAUNER, C. J
Format: Article
Language:English
Subjects:
Animal aquaculture
Animal behavior
Animal populations
Animal productions
Animal, plant and microbial ecology
Applied ecology
Biological and medical sciences
Crustaceans
Exploitation and management of natural biological resources (hunting, fishing and exploited populations survey, etc.)
Fish
Freshwater
Fundamental and applied biological sciences. Psychology
Lepeophtheirus salmonis
Marine
Mortality
Oncorhynchus gorbuscha
Pisciculture
Vertebrate aquaculture
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cited_by cdi_FETCH-LOGICAL-c421t-f8cde6c1f32e7b4d20ea410b248ebe10c42d9a22adc64dd042eb533f3d949fab3
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description Sea lice ( Lepeophtheirus salmonis ) of fish-farm origin have been implicated in reducing populations of pink salmon ( Oncorhynchus gorbuscha ) in British Columbia’s Broughton Archipelago. Owing to the physically disruptive nature of louse attachment to fish skin in a hyperosmotic environment, we hypothesize that the impacts on fish performance are ionoregulatory in origin. Therefore, ionoregulatory status was measured in juvenile pink salmon artificially infected in the laboratory and naturally infected in the wild. Body [Na + ] of laboratory-infected fish (∼1 week seawater (SW); 0.2–0.4 g) increased significantly by 12% with a single chalimus-4 louse, and by 23% with 2–3 chalimus-3 lice. Mortality over this 24-day trial was 2.4% for fish initially infected with 1–3 lice. Body [Na + ] for fish caught with natural infections (∼4–12 weeks SW; 0.5–1.5 g) did not differ from uninfected controls. Combining data sets revealed a “no effect” threshold of 0.5 g for body [Na + ] of fish infected with one chalimus-4 louse. We propose that this size-related louse tolerance is associated with hypo-osmoregulatory development, adding to a previously suggested multifactorial mechanism based on epidermal and immune system development. We suggest management bodies consider this fish-mass threshold when planning to minimize risk to wild fish populations.
doi_str_mv 10.1139/f2011-037
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We propose that this size-related louse tolerance is associated with hypo-osmoregulatory development, adding to a previously suggested multifactorial mechanism based on epidermal and immune system development. We suggest management bodies consider this fish-mass threshold when planning to minimize risk to wild fish populations.</abstract><cop>Ottawa, ON</cop><pub>NRC Research Press</pub><doi>10.1139/f2011-037</doi><tpages>10</tpages></addata></record>
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source NRC Research Press
subjects Animal aquaculture
Animal behavior
Animal populations
Animal productions
Animal, plant and microbial ecology
Applied ecology
Biological and medical sciences
Crustaceans
Exploitation and management of natural biological resources (hunting, fishing and exploited populations survey, etc.)
Fish
Freshwater
Fundamental and applied biological sciences. Psychology
Lepeophtheirus salmonis
Marine
Mortality
Oncorhynchus gorbuscha
Pisciculture
Vertebrate aquaculture
title Pink salmon (Oncorhynchus gorbuscha) osmoregulatory development plays a key role in sea louse (Lepeophtheirus salmonis) tolerance
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