On-farm growth performance of rainbow trout fry in Bhutan

Abstract

This study was conducted to evaluate the growth performance, survival rate and the feed conversion ratio of the Rainbow trout frys fed with fish feed imported from Kolkata, India. A total of 70,000 eyed ova Rainbow trout (Onchorhynchus mykiss) was evaluated for the period of nine months at National Research and Development Centre for Riverine and Lake Fisheries, Haa. The measurement was taken at the interval of 21 days after incubation. The fishes were fed @ 5% of body weight and were fed thrice in an hour till the stock attained weight of 9.50g and length of 9.72cm, followed by thrice a day feeding. The fish growth parameters were recorded monthly through random sampling of 20 fishes. The initial and final average weight and length of fishes were recorded 0.10g, 48.80g and 27.5 mm, 156 mm, respectively. The specific growth rate of 1.47% and FCR of 3.5:1 was recorded. The survival rate of 2.69% is considered extremely low highlighting urgent need to invest in feed quality improvement and associated management practices.