The Effect of Red Algae (Pyropia yezoensis) Diets on Plasma IGF-1 and Growth Performance in Juvenile Flounder (Paralichthys olivaceus)

Presentation Number: SUN 254
Date of Presentation: April 2nd, 2017

Youn-Hee Choi*1, Hyon-Sob Han2, Kang-Woong Kim2, Bong-Joo Lee2 and Taek-Jeong Nam3
1Pukyong National University, Busan, Korea, Republic of (South), 2National Institute of Fisheries Science, Pohang, Korea, Republic of (South), 3Pukyong Natl Univ, Busan, Korea, Republic of (South)


The effect of red algae (Pyropia yezoensis) diets on the growth of juvenile olive flounder (Paralichthys olivaceus) was evaluated in growth performance, levels of insulin-like growth factor 1 (IGF-1), and interleukins in juvenile olive flounder (P. olivaceus). Five experimental diets were formulated that contained different processing methods of an extract of P. yezoensis (common feed, CF; laver powder, P; alcoholic extraction of laver, AE; high pressure heating extraction of laver, HPHE; and acid hydrolysis extraction of laver, AHE). Experimental groups were established in triplicate (40 fish/group, body weight 123.7 ± 1.1 g) and fed for 6 weeks. No significant differences in weight gain, daily growth rate, and feed efficient was determined (P > 0.05), however, the fish fed HPHE had the greatest growth performance. Feeding fish with the laver extract resulted in the highest protein efficiency ratio compared to the control (CF) and laver powder (P) group. The experimental groups taking P. yezoensis extraction had significantly more IGF-1 (P < 0.05) as compared to the control group. The high values of interleukin (IL) levels showed that P and HPHE in IL-2, HPHE in IL-12 and all of the experimental groups in IL-6.


Nothing to Disclose: YHC, HSH, KWK, BJL, TJN