A preliminary study of dietary protein requirement of juvenile marbled flounder (Pseudopleuronectes yokohamae) |
| |
Authors: | Jeong-Hyeon Cho Seunghyung Lee Bong-Joo Lee Sang-Woo Hur Kang-Woong Kim Maeng-Hyun Son Dong-Jae Yoo |
| |
Institution: | Inland Fisheries Research Institute,National Institute of Fisheries Science,Gapyeong,12453,South Korea;Department of Marine Bio-materials and Aquaculture,Pukyong National University,Busan,48513,South Korea;Aquafeed Research Center,National Institute of Fisheries Science,Pohang,37517,South Korea;Gyeongsangbuk-do Fisheries Resources Institute,Yeongdeok,36405,South Korea;Gyeongsangbuk-do Native Fish Business Center,Uiseong,37366,South Korea |
| |
Abstract: | An 8-week feeding trial was conducted to determine the optimal dietary protein level for juvenile marbled flounder. Five semi-purified test diets were formulated to contain different protein levels (CP) including 42.7%, 47.4%, 53.3%, 58.8%, and 64.5% (dry matter), named as CP42.7, CP47.4, CP53.3, CP58.8, and CP64.5, respectively. Five hundred and twenty-five juveniles (6.0 ± 0.1 g) were randomly distributed into 15 tanks (300 L tanks), resulting in 35 fish per tank (n = 3 tanks). Fish were fed the test diets 5 times per day until satiation. The CP58.8 resulted in the highest gain in weight and the best efficiency in feed utilization among the tested protein levels (P < 0.05). Fish fed the CP58.8 diet showed significantly higher whole-body protein and lipid contents than the fish that were fed the other diets (P < 0.05). Fish fed the CP53.3, CP58.8, and CP64.5 diets showed a significantly higher dorsal-muscle lipid content than the fish that were fed the CP42.7 and CP47.4 diets (P < 0.05). The one-slope straight broken-line regression analysis on the results of the thermal growth coefficient and feed conversion ratio indicated that the estimated optimum dietary protein level was 58.8%. Taken together, it is suggested that the dietary protein level of 58.8% is optimal for better growth and high efficiency in feed utilization for the juvenile marbled flounder. |
| |
Keywords: | Marbled flounder Pseudopleuronectes yokohamae Protein requirement Growth performance Proximate composition |
本文献已被 万方数据 等数据库收录! |
|