Effect of Betaine as a Feed Attractant on Growth, Survival, and Feed Utilization in Fingerlings of the Indian Major Carp, Labeo rohita

The study evaluated the efficiency of betaine as a feed attractant on growth, survival, and feed utilization in fingerlings of rohu (Labeo rohita). Betaine was incorporated at 0 (control), 0.25%, 0.50%, or 0.75% in a 30% protein diet and fed to fingerlings for 120 days in a closed and aerat- ed recirculating system. Feed was offered twice daily at a rate of 5% of the fish biomass during the first 15 days and 3% afterwards. Significantly better growth, specific growth rate, survival, food conversion ratio, and protein efficiency ratio were obtained in the group fed 0.25% betaine