전복(Haliotis discus hannai) 치패용 배합사료 내 미역(Undaria pinnatifida) 대체원으로써 구멍갈파래(Ulva australis)와 김(Porphyra tenera) 부산물의 대체 효과 = Replacing Undaria pinnatifida with Ulva australis and Laver Porphyra tenera By-products in Abalone Diet: Effects on Growth and Body Composition in Juvenile Abalone Haliotis discus hannai

다국어 초록 (Multilingual Abstract)

This study investigated the effects of replacing Undaria pinnatifida with a combination of U. australis and laver byproduct (LB) in the formulated diets of juvenile abalone Haliotis discus hannai. The experimental diets replaced 25%, 50%, 75% and 100% of the U. pinnatifida in the control diet with a 1:1 mixture of U. australis and LB (UL25, UL50, UL75 and UL100). Juvenile abalones (initial weight: 0.7 g) were reared in 15 flow-through rearing system tanks for 15 weeks. The survival rate was not significantly different among the experimental diets (P>0.05). However, weight gain and specific growth rate were significantly higher in abalones fed the UL50 and UL75 diets than in those fed the control and UL25 diets (P<0.05), with no significant differences from UL100 (P>0.05). Shell growth and the ratio of soft body weight to total weight of abalones did not differ significantly among the experimental diets (P>0.05). In conclusion, U. pinnatifida can be completely replaced with a combination of U. australis and LB in formulated diets for juvenile abalones without compromising growth. The highest growth was observed at the 75% replacement level, demonstrating the potential of U. australis and LB as sustainable alternative feed ingredients in abalone aquaculture.