Zebrafish, or zebra danio, is a tropical fresh-water fish not only popular in aquariums around the world, but in research tanks as well.  continued…  Photo by 
Jürgen Berger / Mahendra Sonawan:)

Zebrafish, or zebra danio, is a tropical fresh-water fish not only popular in aquariums around the world, but in research tanks as well. continued… Photo by
Jürgen Berger / Mahendra Sonawan
:)