Evaluation Of Extruded Pellets and Dough Feed For Growth Of Japanese Eel (Anguilla Japonica)

A 10-week feeding trial was carried out to compare the efficiency of extruded pellets (EP) and dough feed for the maximum growth and survival of Japanese eel (Anguilla japonica) reared in the flow through system. Four isonitrogenous diets comprising of diet designated as FFNRC was formulated in our laboratory, while dough feed (MP) was supplied by domestic feed company and two sizes of EP designated as EP1 (3mm) and EP2 (2mm) were supplied by EWOS, Canada. Twenty fish averaging 21.3 ± 1.0 g (mean±SD) were randomly distributed into 12 circular 300 L volume tanks. Triplicate groups of fish were fed one of the experimental diet. Weight gain (WG), specific growth rate (SGR) and feed efficiency (FE) of fish fed EP1 and FFNRC diet were significantly higher than those of group fed EP2 and MP diet. While, there were no significant difference in these parameters among the group fed EP2 and MP also among EP1 and FFNRC diet. Hematological parameters showed no significant difference. Based on the results of this study, feeding practice in eel aquaculture could be revised by switching over from dough feed to extruded pellet for better growth in a sustainable manner in Korea where the dough feeds are more popular than extruded pellets.