<；P>；PROBLEM TO BE SOLVED: To provide a fish GTH protein to which a mammalian sugar chain is added, and to provide a method for inducing maturation of fish by using the protein. <；P>；SOLUTION: The fish GTH protein to which the mammalian sugar chain is added is obtained by expressing the fish GTH protein by using a mammal cell. The fish GTH protein to which the mammalian sugar chain is added is a hardly degraded protein having elongated survival in vivo, and long-term stability in the fish body, and can induce the maturation of the fish. The method carries out the induction of the maturation of the fish by using the fish GTH protein to which the mammalian sugar chain is added. <；P>；COPYRIGHT: (C)2011,JPO&INPIT
