Effects of different dietary selenium sources (selenium nanoparticle and selenomethionine) on growth performance, muscle composition and glutathione peroxidase enzyme activity of crucian carp (Carassius auratus gibelio)

An experiment was conducted to compare the effects of selenium nanoparticle (T-1) and selenomethionine (T-2) on crucian carp, Carassius auratus gibelio. There were significant differences (P < 0.05) in relative gain rate and final weight of T-1 and T-2 compared with the control. Survival rate and feed conversion ratio (FCR) were not affected by the dietary treatments. Fish fed the basal diet (control) showed lower (P < 0.05) selenium content in muscle (6.10 ± 0.78 μg g− 1) compared to T-1 and T-2 (16.42 ± 1.07 μg g− 1 and 13.52 ± 1.31 μg g− 1, respectively). Furthermore, the highest value (P < 0.05) of selenium content in muscle was observed in T-1. Glutathione peroxidase (GSH-Px) activities in carps plasma and liver of T-1 and T-2 were significantly different (P < 0.05) with that of the control. However, no significant differences were observed in GSH-Px activities both in plasma and liver between T-1 and T-2.