Liver concentrations of α-tocopherol significantly increased at each incremental level of dietary vitamin E. Similar findings have been reported for other fish species.
However, therewas a trend of decreasing liver levels ofα-tocopherolwith increasing dietary lipid levels, and the value of this variablewas significantly lower in fish fed the highest lipid levels (14%).
The decrease in tissue α-tocopherol content in fish fed increasing levels of dietary lipid high in n−3 HUFA has also been observed in rainbow trout (Oncorhynchus mykiss), Atlantic salmon (Salmo salar), blue tilapia, turbot (Hypsopsetta gutulata) and Japanese flounder.
It was suggested that vitamin Ewas increasingly utilized as an antioxidant to protect tissue lipids from oxidation due to greater amounts of n−3 HUFA in tissues of fish fed higher levels of dietary lipid.