Zebrafish, aka Danio Rerio or "zebra danios" are a variety of minnow named for their striking black-and-white striped bodies. These fish are widely ... to keep them from jumping out.

In many species, Johnson says, these lesions are black, “but in some species they’ll show up as white.” They form on the skin, scales and fins of fish. The spots appear when the free-swimming, larval ...