Since Yorktown Technologies first sold its genetically modified pet — the GloFish — in 2003, the fluorescent fish, an altered variety of zebra fish, has become a popular aquarium item, with ...

Back in 2003, biotech company Yorktown Technologies developed a genetically modified fluorescent fish that was neon-bright and glowed in the dark under black light. Since that time, the company ...

GloFish are unique creatures with vivid colors that will brighten up any tank. Scientists created them to help with environmental studies, but they have quickly gained popularity in home aquariums.

The two GloFish are very different, however, in what environmentalists and some experts say is a crucial way: The heat-loving zebra fish is from southern Asia and can’t survive long in cooler U ...