치어기 참다랑어(Thunnus thynnus) 사료 내 주단백질원료로써 효소처리어분의 효과

Abstract

This study was conducted to estimate effects of a dietary enzyme treated fish meal (EFM) as a major protein source on growth, feed utilization and digestive enzyme activities of bluefin tuna Thunnus thynnus. In the first feeding trial (trial 1), total one hundred juvenile Atlantic bluefin tuna (body weight: 0.68g) were randomly stocked into two concrete tanks (69 tones) and fed two experimental diets for 15 days. The two diets were EFM-based diet and frozen sand lance (SL) as a raw fish feed. Weight gain was not significantly different between tuna fed EFM and SL. In the second feeding trial (trial 2), total thirty juvenile bluefin tuna (initial body weight 10.7g) were randomly stocked into the same experimental tanks and fed two diets for 14 days. The diets were EFM based diet and sardine fish meal based diet (FM). Weight gain was higher in fish fed EFM than that of fish fed FM. Feed intake was higher in fish fed FM than that of fish fed EFM. This study indicates that the dietary EFM could be an excellent protein source that can be used for Atlantic bluefin tuna feeds.