GloFish fluorescent fish
The GloFish is a patented GM zebrafish with bright red, green, orange-yellow, blue, and purple fluorescent colors. It is one of the first genetically modified animals to become publicly available as a pet. The fish is originally the Zebrafish, a native of rivers in India and Bangladesh. A gene called green fluorescent protein (GFP), originally extracted from a jellyfish, that naturally produced bright green fluorescence was used to make them flourscent. The original idea was to develop a fish that could detect pollution by selectively fluorescing in the presence of environmental toxins.