Abstract
Abstract This study investigated the growth and immune function effects following partial replacement of fish meal with dried testes meal from pink salmon ( Oncorhynchus gorbuscha ) testes collected from Alaskan seafood processing byproducts. It was hypothesized that the dietary nucleotide content of testes meal may provide an immunostimulatory effect in rainbow trout ( Oncorhynchus mykiss ). Three diets were formulated and used for this study; a commercial type control diet, a Macrogard diet, and an experimental diet containing 50 g kg − 1 testes meal. Triplicate groups of juvenile rainbow trout (8.65 ± 0.13 g fish − 1 ) were fed each diet for 12 weeks, at which time they were challenged with Flavobacterium psychrophilum (the causative agent of coldwater disease). No significant differences in feed conversion ratio or specific growth rates were observed. Kidney macrophage (phagocytic) activity was significantly (P
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