Studies on growth and ecological conversion efficiency of young fish of Hapalogenys nitens

The young fish of Hapalogenys nitens (Richardson) was fed with minced sadine meat in the laboratory at the temperature of 22.5±0.5℃, and the growth curves of (body’s) weight and length, the ecological conversion efficiency and the special growth rate of Hapalogenys nitens with its body’s weigh 4.6～6.5g at the beginning of the experiment were determined by the Egger’s gut content method. The results showed that in the period of the experiment, the body’s weigh and length increased with time in straight lines, the growth curves are W_t(w.w.)=0.391 7t+5.766 2(R=(0.999 6)) and L_t=0.105t+6.265(R=0.989 9),respectively. When the remaining food in the stomach was expressed by wet weight, the gastric evacuation rate (R_t) is 1.23 4×10~(-3)((m/m)/h;) the daily food consumption (C_d) was 1.342 9g (w.w.). The growth and ecological conversion efficiency (E_g) is 29.50%±2.77%[m/m(w.w.)], and the special grow rate (SGR) is 4.71%±0.69%[m/m(w.w.)].