Ảnh hưởng của thức ăn, mật độ đến tăng trưởng và tỷ lệ sống của cá chình bông Anguilla marmorata (Quoy and Gaimard, 1824) giai đoạn giống

Abstract

     The study was carried out to find the suitable feed and density for rearing eel fingerlings at 10-20 g/each Fish were reared in plastic tanks (125 L), still water and continuously aerated. Experiment 1, fish were fed with 3 types of food: minced fresh fish, fresh fish combined with commercial feed (powder form) and commercial feed. Experiment 2, fish were stocked at 3 densities: 300, 500 and 700 ind./m³. Each treatment was triplicated and each experiment within 3 months. Experimental results showed that fish fed commercial feed had the highest growth in weight, length and survival rate and had a significant difference (P<0.05) compared with the other two treatments. At the end of the experiment, fish weight was 17.9-24.7 g/each, DWG 0.07-0.15 g.d^-1, SGR 0.47-0.85%.d^-1 and survival rate 78.9- 87.8%. Weight growth and survival rate of eels tended to decrease with increasing stocking density (P<0.05). The weight of fish was 22.6, 19.3 and 16.6 g/each; DWG 0.06, 0.09 and 0.12 g.d^-1, SGR 0.47, 0.61 and 0.85%.d^-1 and survival 81.3, 83.9 and 91.7%, respectively in 3 experimental density. Rearing eels from size 10 g/each, it is recommended that to use commercial feed and stock at density of 300 ind./m³.