Figure 6.

Effects of dietary fish oil substitution by DHA-rich microalgae and source of astaxanthin on hepatic mRNA levels of GPX1a (A,B), GPX1b1 (C,D), and GPX1b2 (E,F) of juvenile rainbow trout fed the plant meal- (PM, A,C,E) and fishmeal (FM, B,D,F)-based diets. Means labelled with different letters [lowercase (a, b), synthetic astaxanthin (SA) groups; uppercase (A, B), microalgae astaxanthin (AA) groups] are different between various fish oil substitutions (p < 0.05). The absence of different letters (a, b or A, B) between means indicates no significant differences. GPX: glutathione peroxidase. FO: fish oil. AST: astaxanthin.