నైరూప్య

Comparison of Controlled Nursery Rearing of Hybrid Tilapia Seeds in Different Culture System

Alish Debbarma*, Anupam Tripura

The experiment was conducted to find out the best nursery rearing system for hybrid tilapia young fry. Quality fingerlings in tilapia are very important for initial seed rearing. For this reason it is advisable for farmers to generate their own fingerlings if they cannot ascertain the quality of those from other sources. Poor fingerlings result in poor harvests. Developing a best nursery rearing system can meet the demand of fingerling required by farmers. Nursery rearing of hybrid tilapia young fry (Red strain) was undertaken in two types of rearing systems for 21 days. Young fry of hybrid tilapia (0.12 ± 0.019 g ABW) were stocked in hapa at a stocking density of 0.87 fish/lit and in 5 aquarium tanks at a stocking density of 0.88 fish/lit. Crumble feed of 30% CP was given per day 7 times in 1st week and 6 times in 2ndweek and 5 times in 3rd week in both hapa and tank fishes. The physico-chemical parameters of hapa and aquarium tank were taken every day. Do, pH, TDS, alkalinity and temperature were higher in hapa than tank water, ammonia is found higher (0.5-1 mg/lit) in aquarium tank system. After 21 days of trial, hapa stocked fishes had a weight gain of 3.48 g, while the fishes in aquarium tank had weight gain of 2.58 g. The survival rate in hapa was 97% and in aquarium tank was 85%. The hapa rearing resulted in 74% more growth than in the glass aquarium tank. The final ABW of fishes reared in hapa was 3.6 g while that of aquarium tanks was 2.7 g. The body colour of the fishes in hapa was brighter than the tank of fishes.