Just out of curiosity, what sort of methods are they trying?
I don't know. I do know they are trying everything they can, and emmen also employes biologists, so I would say, every possible method. But I don't think there's that much they can do about it, and even if there's some circumstance that increases the chance of male's being born, there still are too much males being born. Even then the number of females being born should have been higher then it is now.