The studies on the influence of ambient salinity on the nutritional requirement in fishes

2014 Fiscal Year Final Research Report

• Project/Area Number: 25660165
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Aquatic life science
• Research Institution: Tokyo University of Marine Science and Technology
• Principal Investigator: SATOH Shuichi 東京海洋大学, 海洋科学技術研究科, 教授 (80154053)
• Co-Investigator(Kenkyū-buntansha): HAGA Yutaka 東京海洋大学, 大学院海洋科学技術研究科, 准教授 (00432063) ; KONDO Hidehiro 東京海洋大学, 大学院海洋科学技術研究科, 准教授 (20314635)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: 塩分 / 栄養代謝 / 脂肪酸 / アミノ酸

Outline of Final Research Achievements

The nutritional requirements in freshwater fish and marine fish were quite different. Especially, the requirement of essential fatty acid and taurine which is amino acid related compounds is different. Thus the structural analyses for gene of cystein sulfinic acid decarboxylase which relates taurine synthesis was conducted in red sea bream, yellowtail, sea bass, and barfin flounder. And the expression in each organ and tissues were also determined. The expression in liver and pyloric caecum was strong. The influence of the dietary docosahexaenoic acid (DHA) and taurine and the salinity of ambient salinity on the expression of the gene of synthetic enzyme of DHA and taurine was determined with Japanese flounder. It was demonstrated that the expression of the gene for the synthesis of DHA and taurine was influenced by the content of DHA and taurine in live food and the change of salinity.

Free Research Field

魚類栄養学