plSSN : 0374-8111 | elSSN : 2287-8815
plSSN : 0374-8111 | elSSN : 2287-8815
plSSN : 0374-8111elSSN : 2287-8815
Replacing Undaria pinnatifida with Ulva australis and Laver Porphyra teneraBy-products in Abalone Diet: Effects on Growth and Body Compositionin Juvenile Abalone Haliotis discus hannai
김준·정성목·배진호·김민기· 김기승1·허상우2*
국립수산과학원 사료연구센터, 1국립수산과학원 동해수산연구소, 2국립수산과학원 연구협력과
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.
Undaria pinnatifida, Laver by-product, Porphyra tenera, Abalone, Ulva australis