There is a fish like that!
GloFish? fluorescent fish will be on sale at a pet shop near you beginning January 5, 2004.
Info:
Where do fluorescent zebra fish come from?
Fluorescent zebra fish were specially bred to help detect environmental pollutants. By adding a natural fluorescence gene to the fish, scientists are able to quickly and easily determine when our waterways are contaminated. The first step in developing these pollution detecting fish was to create fish that would be fluorescent all the time. It was only recently that scientists realized the public's interest in sharing the benefits of this research. We call this the GloFish? fluorescent fish. Link
