Effects of dietary leucine levels on growth, tissue protein content and relative expression of genes related to protein synthesis in juvenile gibel carp (Carassius auratus gibelio var. CAS III)

An 8‐week feeding trial was conducted to investigate the impacts of dietary leucine on growth, hepatopancreas and muscle protein content and relative expressions of protein synthesis‐related genes in juvenile gibel carp (5.2 g). Triplicate tanks of fish (22 fish per tank) were fed with a low (0.82%), middle (1.90%) or high (2.99%) leucine diet to apparent satiation three times a day. The results showed that the weight gain (WG) and feed efficiency (FE) of the fish fed with the 1.90% leucine diet had the highest values compared to those of other two groups (p