| 摘要 |
The present invention relates to fish with increased unsaturated fatty acid content by transfer of a fatty acid desaturase gene thereinto, and a production method of these fish with increased unsaturated fatty acid content. The fatty acid desaturase gene is one or more members selected from among Delta4 fatty acid desaturase gene, Delta5 fatty acid desaturase gene and Delta6 fatty acid desaturase gene, and it is preferable that these genes originate in a freshwater fish. It is preferable that the expression of a fatty acid desaturase gene originating in a freshwater fish is promoted by a beta-actin promoter originating in medaka. By modifying the fatty acid metabolic pathway of fish, problems to be solved by the present invention may be to provide fish having a high vitality and a tolerance to handling and low temperature, which will enable the use of a vegetable fat or animal fat as a formula feed. Such vegetable fat is less expensive and can be easily controlled in qualities, thereby largely contributing to the reduction of cost and labor in fish nursery sites.
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