This is the latest photograph of a Goleta Dart that a few weeks ago was nearly colorless with a 'gold spike' on his tail. The green splash near the tail is one of the traits that appears every few generations.
This fish got me thinking a lot about the genetics of the population that I've been maintaining over the counter viagra. A lot of subjects that I first heard about in ninth grade biology, like genetic drift and the founder effect. Anyway, to make a long story short I found this article on the present status of wild guppies as an ornamental fish.