Dietary taurine improves reproductive performance of Nile tilapia (Oreochromis niloticus) broodstock

作者：Al Feky S S A; El Sayed A F M^*; Ezzat A A

来源：Aquaculture Nutrition, 2016, 22(2): 392-399.

DOI：10.1111/anu.12256

• broodstock
• hatchability
• Nile tilapia
• reproduction
• taurine

This study was conducted to evaluate the effects of supplemental taurine on reproductive performance of Nile tilapia (Oreochromis niloticus) broodstock fed soybean meal-based diets. Four isonitrogenous (350gkg(-1) protein), isocaloric (18MJkg(-1)) diets were formulated to contain 0, 5, 10 and 15gkg(-1) taurine. The diets were fed to triplicate groups of juvenile Nile tilapia (10-15g average body weight) at a female: male ratio of 3:1, to apparent satiation, three times per day for 130days. The size at first maturation decreased with increasing dietary taurine to 10gkg(-1) and levelled off with further taurine supplementation. The time to first spawning was also significantly shorter at 10gkg(-1) taurine level. Spawning performances, including spawning frequencies, total number of spawnings per tank, number of spawnings per female and absolute fecundity, were all significantly improved with increasing dietary taurine up to 10gkg(-1). However, the quadratic regression analyses indicated that the maximum spawning performance occurred at 8gkg(-1) of supplemental taurine. Eggs produced from broodstock fed 10gkg(-1) taurine exhibited significantly higher hatchability and required shorter time for hatching and yolk-sac absorption and also resulted in higher larval weight than at other dietary taurine levels. The highest egg protein, total amino acids and taurine were also obtained at 10gkg(-1) taurine. These results suggest that 8gkg(-1) dietary taurine is required for optimum reproductive outputs of Nile tilapia broodstock.

• 出版日期2016-4