Wild Guppy (Brazil) update, Poecilia reticulata

I have beenkeeping this strain of guppies for about a year now. The population is based on four adult pairs and a few fry, all wild caught (Brazil).

The fish are doing very well, I have however had to downsize to two tanks with separate populations of the same strain.

Below is a sample of some of the male offspring, these would be 2nd and 3rd generation fish. 
I'm looking forward to following the development of these fish, perhaps it will be possible to see physical changes by keeping a photographic record.