Sex ratio in endler

Some time ago a few specimens of Poecilia GOT winglei, peacock common Endler. From a group of fry and some other male i found in less than a month to begin to see fry swimming in a nano aquarium with green prawns chekia.

The parameters are the water from the tap in Valencia and the temperature was the room temperature from April.

I recently picked up more than 40 fry, of which I see not a single male. Is it possible? it must be because the males I've gotten have come with dropper, the rest mostly females, perhaps more than 100 fry that were born in my tanks have left just 10 male.

Do you happen to you like?