A Study on the Specific Growth Rate (SGR) at Different Stages of Tilapia (Oreochromis niloticus) Production Cycle in Tank Based Aquaculture System

The conventional assessment of the specific growth rate (SGR) avoiding intermediary data is highly criticized by scholars as to beginning and end production cycle usually considered for measurement. To evaluate SGR, study was conducted in six concrete tanks under an outdoor laboratory shed from 10th May 29th July 2017. Tilapia (Oreochromis niloticus) fry released at 8 fries per tank recommended stocking density 320 fishes/decimal intensive aquaculture system. experiment, sinking floating feeds treatment 1 (T1) 2 (T2) were used feeding fish, respectively. There three replications each treatment. During experimental period, feed supplied 20%, 15%, 10% body weight 1st, 2nd, 3rd months, daily ration fish divided into two parts delivered morning evening. Aeration facilities installed 24 hours using air stone aerator. Digital balance measuring 3 days intervals assume trend SGR while a customized scoop net sample minimizing stress on fish. gains 126.08±5.65 132.23±1.29 T1 T2, mean percent gain found higher T2 (1715.03±0.00) than (1639.43±0.00). Feed conversion ratio (FCR) 1.97±0.11 2.13±0.18, rates tilapia 4.90±3.03 4.98±2.28 considering cycle, However, initial stage lower later stages. almost static period. FCR correlated with culture This ascertains that pre-determined required amount imparted farmers case which wastes high-cost money. Higher total obtained (1119.52 g) (1070.19 100% survival both treatments. Therefore, determining interval might be useful tool farmer’s level.