What are GloFish tetra?

GloFish are genetically-modified fluorescent fish. The rights to the patented and trademarked breed are held by Yorktown Technologies. As of 2014, GloFish are available in Cosmic Blue, Electric Green, Galactic Purple, Moonrise Pink, Starfire Red and Sunburst Orange and are strikingly similar to the fluorescent species found in nature.

GloFish are bred from the offspring of natural fluorescent fish. They were originally developed by scientists hoping to detect environmental pollutants with the addition of a naturally derived fluorescent gene. GloFish inherit their unique color directly from their parents, maintain the color throughout their lives and eventually pass the color along to offspring.