自然変異系統 National Institute for Basic Biology 京都大学 Da(MT20) Da Double anal fins (dorsal fin resembles the anal fin). Caudal fin is rhombic. In heterozygotes crossed with wild type, the dorsal fin is large and the number of fin rays is larger than in the wild type. 基礎生物学研究所 Kyoto University https://shigen.nig.ac.jp/medaka/strainDetailAction.do?strainId=19 Natural mutant strains MT20