STUDY ON THE EFFECTS OF DIFFERENT DIETS ON THE GROWTH AND SURVIVAL RATE OF KNIFEFISH NOTOPTERUS NOTOPTERUS (PALLAS, 1769) IN LE THUY DISTRICT, QUANG BINH PROVINCE

Abstract

Study on the effects of different diets on the growth and survival rate of Knifefish Notopterus notopterus (Pallas, 1769) was conducted from January 2017 to June 2018 in Le Thuy District, Quang Binh Province. The study was arranged with three treatments, including the first treatment using trash fish feed, the second treatment using pelleted feed with protein content of 20%, and third the treatment using combination feed: 50% trash fish + 50% pellet with content 20% protein. Fingerling size in the experiment ranged from 3.7 to 6.3 cm in length, corresponding from 0.8 - 1.68 g in weight. The results showed that fish had the highest average weight at harvest (87.36g/fish) and the highest survival rate (74.12%) in Treatment 3. In treatment 2, fish had the lowest average weight (74.67g/fish) and the lowest survival rate (65.35%). Feed conversion ratios in 3 experiments ranged from 1.1 to 3.0. Commercial grow-out of Knifefish used trash fish feed combined with 20% pellet feed results in the highest growth, survival and economic efficiency.