supplemental effects of coated methionine and/or lysine to soy protein isolate diet for juvenile kuruma shrimp, MArsupenaeus japonicus

M.S. Alam, S. Teshima, S. Koshio, M. Ishikawa, D. Hasegawa, L.H.H. Hector, O. Uyan

A six week feeding trial was conducted using six test diets to examine the utilization of soy protein isolate (SPI) supplemented with either coated ornon-coated methionine and/or lysine by juvenile kuruma shrimp, Marsupenaeus japonicus. A diet without supplementation of methionine and lysine to SPI and a control diet using squid meal and casein were also prepared. Each test diet was fed to triplicate groups of shrimp (about 0.4 g) for two times a day. The shrimp fed the diets supplemented with coated methionine or lysine to SPI trended to higher weight gain compared to shrimp fed the diet without supplementation of amino acids. The juveniles fed the SPI diet contained both coated methionine and lysine showed significantly higher growth performance than those fed the SPI diet contained non-coated methionine and lysine. Feed efficiency ratio, protein efficiency ratio and apparent protein retention in the whole bodies were also significantly influenced by the supplementation of methionine and lysine. The whole body proximate, total amino acid and free amino acid composition showed few differences among the groups. This study indicated that SPI could be a suitable alternative protein sources for kuruma shrimp. Results also suggest that the dietary value of SPI diet is improved by the supplementation of amino acids and both pre-coated methionine and lysine supplementation could be more beneficial for further improvement of SPI diet fur juvenile kuruma shrimp.

(Laboratory of Aquatic Animal Nutrition, Faculty of Fisheries, Kagoshima University, Shimoarata-4-50-20, Kagoshima-890-0056, Japan, e-mail: alam1@rocketmail.com)

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