image: A Japan Sea male. They cannot survive in freshwater habitats. This material relates to a paper that appeared in the May 31, 2019 issue of Science, published by AAAS. The paper, by A. Ishikawa at National Institute of Genetics in Shizuoka, Japan, and colleagues was titled, 'A key metabolic gene for recurrent freshwater colonization and radiation in fishes.' view more
Credit: Ryu Uchiyama