PROBLEM TO BE SOLVED: To provide a breeding method capable of efficiently increasing a feeding amount in which feeding problems are caused due to influence of egg quality, environment, etc., in the breeding of fishes, often resulting in poor growth and degradation of a survival rate.SOLUTION: A breeding method characterized by irradiation of ultraviolet rays to larvae of intractable seedling fish species can increase the feeding number and growth of the larvae more than that reported conventionally. Also, the blue/green light of wavelength 400-560 nm irradiates the larvae for a certain period of time, and thereby can promote a bladder opening cavity and suppress the occurrence of malformation several months later.SELECTED DRAWING: None【課題】魚類の飼育では、卵質、環境の影響等で摂餌不良を起こし、結果成長不良や生存率の低下を引き起こすことが多いため、効率よく摂餌量を高めることが出来る飼育方法を提供する。【解決手段】難種苗生産魚種の仔魚に対して紫外線を照射することを特徴とする飼育方法は、従来報告されたものより仔魚の摂餌数と成長を増加させることができる。また波長４００～５６０ｎｍの青・緑色光を一定期間照射することで鰾開腔を促進させることができ、数か月後の奇形の発生を抑制することができる。【選択図】なし
