Both members of the teleost family of ray-finned fish, zebrafish (Danio rerio) and medaka (Oryzias latipes) descended from a common ancestor that lived millions of years ago. Both are about 1.5 ...

For a creature that’s less than one and a half inches long, the zebrafish (Danio rerio ... he says. One of the fish’s advantages is clear—literally. Because embryos are transparent and ...