Differential rejection of salmon lice by pink and chum salmon: disease consequences and expression of proinflammatory genes

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DOIResolve DOI: http://doi.org/10.3354/dao075229
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TypeArticle
Journal titleDiseases of Aquatic Organisms
Volume75
Issue3
Pages229238; # of pages: 10
SubjectOncorhynchus gorbuscha; Oncorhynchus keta; Lepeophtheirus salmonis; sea lice; immune response
AbstractThe consequences of high (735 copepodids fish–1) and low (243 copepodids fish–1) level exposures of size-matched juvenile pink and chum salmon to Lepeophtheirus salmonis copepodids were examined. At both levels of exposure the prevalence and abundance of L. salmonis was significantly higher on chum salmon. In addition, the weight of exposed chum salmon following the high exposure was significantly less than that of unexposed chum salmon. At both exposures, the haematocrit of exposed chum salmon was significantly less than that of unexposed chum. Neither weight nor haematocrit of pink salmon was affected by exposures at these levels. Despite the presence of microscopic inflammatory lesions associated with attachment of L. salmonis on the epithelium of gill and fin of both salmon species, there were no mortalities following either exposure. A transient cortisol response was observed in chum salmon 21 d after low exposure. An earlier and quantitatively higher expression of the proinflammatory genes interleukin-8 (IL-8), tumour necrosis factor ?-1 (TNF?-1) and interleukin-1? (IL-1?) in fin and head kidney of pink salmon suggested a mechanism of more rapid louse rejection in this species. Together, these observations indicate a relatively enhanced innate resistance to L. salmonis in the juvenile pink salmon compared with the juvenile chum salmon.
Publication date
Copyright notice© Inter-Research 2007
LanguageEnglish
AffiliationNRC Institute for Marine Biosciences; National Research Council Canada; NRC Genomics and Health Initiative
Peer reviewedYes
NRC number1246
NPARC number3538116
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Record identifier03e100f5-4ff3-4f23-b79a-b2e6e7445b78
Record created2009-03-01
Record modified2016-05-09
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