Not a hybrid either; but a cool engineered fish is the glofish. This is a common zebra danio
(Brachydanio rerio ) that has been genetically alter to have flourescent green or pink color. They were oiginally produced to be used as indicator species in polution studies. They have also found their way into the ornamental fish industry as well.
Here is an article about the original use:
http://www.nus.edu.sg/corporate/rese...research12.htm
The link to the comercial site:
http://www.glofish.com
And heres a look:
