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We explored the influence of nucleoside by-products (NBP) on blood chemistry, immune response, oxidative stress and intestinal morphology of Seriola dumerili. Four experimental diets were formulated where diets 1-3 are semipurified and supplemented with liquid NBP at concentration of 0 (D1, negative control), 30 (D2) and 90 (D3) g/kg. Diet 4 (D4) is a fishmeal-based positive control diet. Each diet was randomly allocated to triplicate groups of fish for 50 days. The results revealed a significant influence of NBP supplementations on total cholesterol, blood urea nitrogen and triglyceride level. Lysozyme activity (LA), total serum protein (TSP) and peroxidase activity (PA) also increased with NBP supplementation as compared to the negative control. TSP, PA and LA were numerically higher in diet groups D2 and D4, respectively. Anterior enterocyte height (hE) was higher in diet group D4, while NBP-supplemented groups showed intermediate values with D1 group and negative control group showed significantly lowest value. Supplementation of NBP also increased anterior fold height (hF) and microvillus height and posterior hF, hE and microvillus height compared with D1. Finally, we concluded that NBP can be used as a cheaper nucleotide/nucleoside source for amberjack. Supplementation of more than 30 g/kg in diets improved blood chemistry, non-specific immunity, oxidative stress resistance and intestinal morphology of amberjack. [ABSTRACT FROM AUTHOR]

A feeding trial was conducted to determine effects of dietary inosine on growth, immune responses, oxidative stress resistance and intestinal morphology of juvenile red sea bream. A semi-purified basal diet supplemented with 0 (D1, control), 2 g kg−1 (D2), 4 g kg−1 (D3), 6 g kg−1 (D4) and 8 g kg−1 (D5) dietary inosine, respectively, to formulate five experimental diets. Each diet was randomly allocated to triplicate groups of fish (initial weight: 8 g). After 50 days of feeding trial, fish fed diets with 4 g kg−1 inosine had the highest ( p < .05) final weight, weight gain and specific growth rate. Similarly, improved feed intake, feed conversion ratio and protein efficiency ratio were also found at 4 g kg−1 inosine supplemented group. Some non-specific immune parameters such as total serum protein, lysozyme activity and bactericidal activity tended to be higher for fish fed diets supplemented with inosine. Peroxidase and catalase activity also influenced ( p < .05) by dietary inosine supplementation. Fish fed 2 g kg−1 and 4 g kg−1 inosine supplemented diets showed the least oxidative stress condition. Inosine supplementation significantly increased ( p < .05) anterior enterocyte height and posterior fold height, enterocyte height and microvillus height compared with control. We concluded that 4 g kg−1 dietary inosine supplementation effectively provokes growth and health performance of red sea bream by increasing growth, immune response, oxidative stress resistance and intestinal health condition. [ABSTRACT FROM AUTHOR]