PROBLEM TO BE SOLVED: To provide a fish or amphibian capable of controlling the reproduction of a specific species. Kind Code: A1 A fish or amphibian having a klf17 gene mutant allele in which the zinc finger domain coding region in the klf17 gene is deleted. A mode in which the fish or amphibian has the allele of the klf17 gene mutant type homozygously. A mode in which the fish or amphibian is a subject for aquaculture or extermination. [Selection diagram] Fig. 4【課題】特定の種の繁殖を制御することができる魚類乃至両生類の提供。【解決手段】ｋｌｆ１７遺伝子におけるジンクフィンガードメインのコード領域が欠損したｋｌｆ１７遺伝子変異型のアレルを有する魚類乃至両生類。前記魚類乃至両生類が、前記ｋｌｆ１７遺伝子変異型のアレルをホモで有する態様。前記魚類乃至両生類が、養殖用、又は駆除の対象である態様。【選択図】図４
