Effects of different stocking densities on the growth and survival rates of of tire track eel (Mastacembelus favus) circulating tank system

Abstract

    Raising tire track eel in a recirculating filter system aims to control diseases, ensure livestock health, and guarantee environmental safety. The study was conducted to determine the feed efficiency of tire track eel, growth rates, and costs during the rearing process in a recirculating filter system. Each treatment was repeated three times after 75 days of rearing, measuring the growth and absolute growth rates in terms of weight and length in treatment 1 NT1 (50 individuals/m³) were WG = 22.36 g, DWG = 0.29 g/day; LG = 9.11 cm; DLG = 0.12 cm/day, and were the highest (significantly different from the other treatments, p < 0.05) compared to the other treatments. The survival rate of the fish ranged from 89.11 % to 92.66 %, the rate of group division in terms of length Cv – Lf and weight Cv-Wf ranges from 8.97 % to 14.10 % and from 17.53 % to 20.47 % (difference not statistically significant, p > 0.05). The feed cost in NT 1 was the lowest at 121.42 thousand VND/kg of fish, and in NT3 it was the highest at 170.37 thousand VND/kg of fish. From the experimental results, it is shown that raising fish at a density of 50 fish/m³ is the best.