Extruded Pellets Research Articles

大豆油粕配合飼料によるブリ幼魚の長期飼育

A long-term feeding experiment was carried out with young yellowtail Seriola quinqueradiata to examine the possibility of practical use of formulated diets with single moist pellets (SMP) and extruded pellets (EP) containing 20 and 30% defatted soybean meal (SBM) as a partial substitute for fish meal. The fish fed with the SMP and EP diets with SBM for 12 weeks showed similar growth, feed efficiency, and protein efficiency ratio to those fed with the control diet. Though feeding SBM diets tended to enlarge their digestive tract appreciably, there were no marked differences in body composition or hematological or serum characteristics between groups throughout the experimental period. Furthermore, similar retentions of dietary protein, fat, and energy in the body were observed in all groups regardless of the dietary types and SBM levels tested. These results indicate that commercial SBM can substitute for fish meal for up to 30% of practical diets for yellowtail.