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.