Park Su-Jin, Seo Bong Seung, Park Hung Sik, Lee Bong-Joo, Hur Sang-Woo, Nam Taek-Jeong, Lee Kyeong-Jun, Lee Seunghyung, Choi Youn Hee
Department of Fisheries Biology, Pukyong National University, Busan 48513, Korea.
AlphaAqua, Busan 47042, Korea.
Animals (Basel). 2021 Jul 9;11(7):2055. doi: 10.3390/ani11072055.
Olive flounder () is a commercially important and valuable species for aquaculture in Korea. Due to the unstable supply of fishmeal for farmed fish, an optimum fish-feed formulation should be researched to ensure the sustainability of aquaculture. This study investigated the effect of three experimental diets: Con (basal diet); FM (20% fishmeal replacement of CON); and FM (30% fishmeal replacement of CON) on over 20 weeks at a typical farm by monitoring the growth and factors relating to sexual maturation. The results showed that no differences in growth were observed between the CON and diet-replacement groups. Gonadal oocyte development was similar between the CON and diet-replacement groups. Moreover, sbGnRH and GH expression did not differ between the CON and diet-replacement groups. The levels of Erβ and Vtg expression were significantly higher in the FM group than in the CON and FM groups after the experimental period. The expression of PSS-I was significantly higher in the FM group than in the CON and FM groups. Therefore, although growth occurred when 30% of the fishmeal was replaced, such high dietary protein replacement may be ill-advised during the maturation of olive flounder at the commercial fish farm.
牙鲆是韩国水产养殖中具有重要商业价值的珍贵物种。由于养殖鱼类的鱼粉供应不稳定，应研究最佳的鱼饲料配方以确保水产养殖的可持续性。本研究通过监测生长情况以及与性成熟相关的因素，调查了三种实验饲料（对照饲料（基础饲料）；FM（用鱼粉替代对照饲料20%）；FM（用鱼粉替代对照饲料30%））在一个典型养殖场20周以上的养殖效果。结果表明，对照饲料组和饲料替代组之间在生长方面未观察到差异。对照饲料组和饲料替代组之间性腺卵母细胞发育情况相似。此外，对照饲料组和饲料替代组之间sbGnRH和GH的表达没有差异。实验期结束后，FM组中Erβ和Vtg的表达水平显著高于对照饲料组和FM组。FM组中PSS-I的表达显著高于对照饲料组和FM组。因此，虽然在鱼粉替代30%时鱼会生长，但在商业养鱼场牙鲆成熟期间，如此高比例的饲料蛋白质替代可能并不可取。
