The first Danios used in the labs used jellyfish genes and they were green. The red coloration comes from coral genes, not jellyfish and the red variety was produced after the green ones. Now the first ones sold as pets, I don't know. Maybe they were red since red is a more popular color than green but the original laboratory fish were green.chromedome52 said:When they were first released to the hobby, they bred the only color they had: red, not green. That's what I had, a very short time after they released them. They were red because it is a much more visible color.
By the time I became aware of them and first saw them, all of the colors were available. That was only a few years ago and I disliked them from the get go. The original ones were produced in 1999.
Interestingly, the rights to the GloFish brand are owned by the Spectrum Corporation which also owns the Tetra line of aquarium products. They also own Remington, Black & Decker, and a lot of other brands of various types of products.