a fancy guppy is nothing more than selectively bred guppies. the longkang guppies have reverted to their wild state. In case you do not know, guppies are from latin america and all guppies in our longkang are descended from once-fancy guppies. some are possibly introduced for mosquito control but most of those are actually mosquito fish from the Gambusia genus. so when catching female "guppies" in the longkang, make sure they are actually guppies and not mosquito fish.
most likely what will happen is you get a huge injection of wild genes into the highly selected fancy guppy gene pool. you will get offspring looking somewhat like the father but with reduced trait (smaller fan tail, shorter dorsal fins, more mixed colours, etc).
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