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ORIGINALARTICLEQuantitativegeneticarchitectureofparasite-inducedcataractinrainbowtrout,OncorhynchusmykissHKuukka-Anttila1,2,NPeuhkuri2,IKolari3,TPaananen4andAKause51DepartmentofBiologicalandEnvironmentalSciences,UniversityofHelsinki,Helsinki,Finland;2FinnishGameandFisheriesResearchInstitute(FGFRI),Helsinki,Finland;3FGFRI,Enonkoski,Finland;4FGFRI,Tervo,Finlandand5MTTAgrifoodResearchFinland,BiotechnologyandFoodResearch,BiometricalGenetics,Jokioinen,FinlandParasitesimposecostsontheirhosts.Thecapabilitytofightagainstthemisofgreatadvantage,butmayalsobetradedoffwithothertraits.Althoughoftenobservedatthephenotypiclevel,ourknowledgeoftheextenttowhichsuchtrade-offsaregeneticallydeterminedisrelativelypoor.WetestedthispossibilitywithafarmedrainbowtroutpopulationsufferingfromnaturalDiplostomumspp.infectionsthatcausecataractsinfish.Weestimatedtheheritabilityofcataractseverityandexaminedphenotypicandgeneticcorrelationsbetweencataractandasetofperformancetraitsmeasuredthreetimesduringa3-yearrearingperio...