Effects of bullet tuna Auxis rochei broth-supplemented diet on growth performance in yearling yellowtail Seriola quinqueradiata

Bullet tuna Auxis rochei broth is food-processing wastewater obtained after boiling ˆsh and is rich in free amino acids and peptides.To e‹ciently utilize bullet tuna broth as ˆsh feed, we investigated the eŠects of bullet tuna broth-supplemented diet on the growth performance in yearling yellowtail Seriola quinqueradiata.Fish meal (FM) and 30 FM-replaced with soybean meal (SBM) diets were used as basal diets.The eŠects of bullet tuna broth on growth performance were conˆrmed with or without supplementation to the basal diets (100 mL/kg diet).After 6 weeks of feeding trial, the growth performance (i.e., body weight, weight gain, speciˆc growth rate and feed e‹ciency) was characterized as FM＋Broth diet group＞FM diet group＞SBM＋Broth diet group＞SBM diet group.We conclude that supplementation of bullet tuna broth to yearling yellowtail diets improves the growth performance.