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About a year & 1/2 ago I populated my newly re-set-up tank with some random $1 guppies from like Meijer I think it was. A few months later I may have added a couple more (also $1 specials). They were all fairly commonly found colors. None of those original male gups lasted more than 8 months, but I think I still have some of the original females.
Anyhow-- It has been very interesting to see the changes in the colors of offspring as time has gone on. I haven't added anything new, and deliberately kept endlers out of that tank. I have not kept track of which females have produced which fry-- it has sort of been a "leave it up to nature and just see what happens" sort of thing for me. It really intrigues me that the colors change so dramatically with each round of offspring.
The first batch of fry had some colors that I wish I had pix of(I posted two blurry pix a while back, but never got any better pix) that I've not found anything like when searching online. I suspect they were endlers crosses but not sure.
Anyhow, the next round of fry the males mostly came out with these beautiful red & yellow tails. The tails were not as large and fanlike as the blue dragons Jimbo posted, and the way the colors were distributed was a bit different too. They were really pretty, but were either harrassed to death or eaten by the rainbow shark and gouramis I had in there at the time. I had given a number to a friend of mine, and I think only one survived(she had a guppy-eating fish too).
So now that the tank is clear of any guppy-beating(or eating) fish, I hope future youngsters will be around long enough to develop fully. (I do have some fish in there that will eat the really young fry,but I've also got enough plants and hiding places that at least some have a fighting chance). I've got a new generation showing their colors, and they're different yet from those who came before. These guys have mostly yellow tails with black-- like the blue dragons Jim has, but pale yellow instead of blue. There are a couple that look as if they may wind up with blue tails, but too young to be sure yet.
It's been fun to observe the color progression.
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