PROBLEM TO BE SOLVED: To provide a transsexual induction method of fishes and a transsexual induction device of the fishes in which the male-conversion of the fishes with hereditary female sex can be induced simply at low-cost, and provide a sex control method of the fishes enabling all female-conversion simply at low-cost.SOLUTION: A transsexual induction method of fishes comprises an irradiation step of performing green light irradiation to the fishes after the hatching before determining sex. A sex control method of the fishes comprises: the irradiation step； and a fertilization step of fertilizing the unfertilized eggs of the fishes by sperms of the fishes having female sex defined in sex chromosome, the fishes that are subjected to the green light irradiation in the irradiation step.SELECTED DRAWING: Figure 6COPYRIGHT: (C)2019,JPO&INPIT【課題】遺伝的性がメスである魚類のオス化を簡便かつ低コストで誘導することができる魚類の性転換誘導方法及び魚類の性転換誘導装置、並びに簡便かつ低コストで全メス化が可能な魚類の性統御方法を提供する。【解決手段】魚類の性転換誘導方法は、孵化後の魚類に対して、性が決定されるまでに緑色光を照射する照射ステップを含む。魚類の性統御方法は、当該照射ステップと、照射ステップにおいて緑色光を照射された、性染色体で規定される性がメスである魚類が有する精子により、該魚類の未受精卵を受精させる受精ステップと、を含む。【選択図】図６
