Effect of Algae as a Feed Additive on Growth Performance in Red Sea Bream, Pagrus major

抄録

Algae as a feed additive improved physiological condition including protein assimilation, lipid metabolism, liver function, stress responses, disease resistance and carcass quality of cultured fish. Effects on the growth performance, feed efficiency, and results of related biochemical analyses of red sea bream fed on algae-supplemented diet are discussed. The algae Ascophyllum nodosum, Porphyra yezoensis, Spirulina sp. and Ulva pertusa were supplemented to the zero year and one-year-old red sea bream diet at 3-5 %. Feeding algal meal as a feed additive elevated growth rate, feed efficiency, protein efficiency ratio and muscle protein deposition. An increase in RNA/DNA ratio and decrease in acid proteinase activity were observed in algae-fed fish. Among the algae tested in these experiments, the effects were pronounced with Spirulina. The results confirmed desirability for algae as a feed additive in growth performance of red sea bream.