The effects of single and repeat Lepeophtheirus salmonis (sea lice) infections on the health of juvenile Pacific salmon
There is evidence that different species of Pacific salmon differ in their susceptibility to infections with sea lice, Lepeophtheirus salmonis, under laboratory conditions. For example, pink and coho salmon have been shown to be less susceptible to sea lice infections than chinook or chum salmon. This multi-year project examined the susceptibility and lethal infection level of juvenile sockeye, coho, pink, and chum salmon to L. salmonis. In addition, the effects of previous exposure to L. salmonis on susceptibility to infection and the physiological and immunological responses was determined for these species.
The immune responses to exposure to L. salmonis were very different among fish sizes. Harmful effects of the sea lice infection were identified in the smaller fish. Larger sized fish responses indicated greater immunity to infection. Just over 80 percent of the exposed pink and chum salmon died. While sockeye salmon had no deaths, there was clear evidence of declining health and weight, particularly at 21 and 28 days.
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Jones, S., Kim, E., and Bennett, W. 2008. Early development of resistance to the salmon louse, Lepeophtheirus salmonis (Krøyer), in juvenile pink salmon, Oncorhynchus gorbuscha (Walbaum). Journal of Fish Diseases 31(8): 591-600.
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Sutherland, B.J., Jantzen, S.G., Sanderson, D.S., Koop, B.F., and Jones, S.R. 2011. Differentiating size-dependent responses of juvenile pink salmon (Oncorhynchus gorbuscha) to sea lice (Lepeophtheirus salmonis) infections. Comparative Biochemistry and Physiology Part D: Genomics and Proteomics 6(2):213-223.
2010 - 2014
Eva Jakob, Fisheries and Oceans Canada, Pacific Biological Station, Pacific Region
Laura Braden, Fisheries and Oceans Canada, Pacific Biological Station, Pacific Region
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