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In that area I collected A. luelingi, urteagai, and rubrolineata. Some of the urteagai were very striking. I don't ever see these fish offered for sale. Don't have any idea about commercial aspects.
In the 1980's I bought steindachneri that were called wickleri. They were larger than the more common steindachneri. Also I believe they came from Guyana, Venezuela, and Surinam.
Yes, UHT is a brand. They are the only black mosquito lavae that I can find to purchase. I have collected mosquito larvae but was looking for a more consistent source.
Not all the fish lose their color over the same time period. In some it has taken several generations while others lose colors significantly in F1.
Interesting information on color vs iridescence.
I manage generations by trying to pick the best looking parents as breeders. Since almost all the fish I have were collected by me there are not a lot of fish to enrich the gene pool. But this does not seem to be genetic since the color changes occur fairly quickly. I think it is environmental...
When fish are collected in the wild their colors are often extraordinary. After a few generations in the home aquarium these colors fade. Feeding diverse foods has not really helped, at least in my tanks. Does anyone have a successful way of maintaining the wild colors?
Continuing my story. The last picture was of a broad and shallow stream where we caught I believe cacatuoides.
Also caught were some rivulus, cories and broca.
Along the bank we saw trees with lots of oropendola nests.
In this small stream we found a fish that I'm not certain of it's identity...