Comparative Studies on Effects of Extruded Pellets and Dough Type Diets on Growth, Body Composition, Hematology and Gut Histology of Juvenile Japanese Eel, Anguilla japonica (Temminck et Schlegel)

摘要

Objective: The present study was conducted to evaluate the effects of two different sizes of extruded pellets and dough type diets on the growth performance, body composition, hematological parameters and gut histology of juvenile Japanese eel, A. japonica . Methodology: A 10-weeks feeding trial was conducted to evaluate the effects of two different sizes of extruded pellets (EP) and dough type diet on the growth performance, body composition, hematology and gut histology of juvenile Japanese eel, Anguilla japonica . Fish with average weight 21.3±1.0 g (means±SD) were fed 3 experimental diets: One dough type diet and two different sizes of Extruded Pellets (EP1- 2 and EP2- 3 mm) in triplicate groups. Results: At the end of feeding trial, the estimated weight gain, specific growth rate and feed efficiency of fish fed EP diets were significantly higher than those of fish fed dough diet (p0.05). No differences in intestinal morphology or development of pathological lesions were evident in fish fed the diets. Conclusion: The results demonstrated that EP2 diet could be a more efficient diet to promote improved growth performance and ensure better water quality parameters in Japanese eel aquaculture.