What Is a Celestial Pearl Danio? Danios are tiny fish that live in Southeast Asia. Most prefer small streams. There are at least 25 different species of Danio, and the largest is only about 3 1/2 ...

Researchers have determined it's a certain gene that keeps pigment cells dispersed and gives the pearl danio its uniform orange color. By expressing this gene the same way in zebrafish, the zebrafish ...