Methionine- and cystine-supplemented diets for juvenile sea bass (Dicentrarchus labrax) |
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| Affiliation: | 1. Marine Fishery Institute of Zhejiang Province, Key Lab of Mariculture and Enhancement of Zhejiang Province, Zhoushan 316100, Zhejiang Province, PR China;2. National and Provincial Joint Laboratory of Exploration and Utilization of Marine Aquatic Genetic Resources, National Engineering Research Center of Marine Facilities Aquaculture, School of Marine Science and Technology, Zhejiang Ocean University, Zhoushan 316022, PR China;3. Faculty of Fisheries, Kagoshima University, Kagoshima 890-0056, Japan;1. College of Animal Science and Technology, Gansu Agricultural University, Lanzhou 730070, China;2. College of Science, Gansu Agricultural University, Lanzhou 730070, China;1. Department of Marine Bio-materials and Aquaculture, Feeds and Foods Nutrition Research Center, Pukyong National University, Busan 48513, Republic of Korea;2. Department of Resource Development Center, Milae Resource ML Co.Ltd., Republic of Korea |
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| Abstract: | Growth studies indicated that methionine-deficient diets can be supplemented with the free sulphur amino acids, methionine and cystine. The best growth rate was obtained with the diets for which the supplemented methionine:cystine ratio was 20:80. No significant effect on body composition of the methionine:cystine ratio could be detected. The serum free methionine increased with the supplemented methionine content in the diet. The serum free cystine did not exhibit such a relationship. The best growth rate and food conversion were obtained with the diet containing 0.91% methionine, 1.29% cystine and a methionine:cystine ratio of 36:64 on a sulphur molar basis. |
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