Sounds Silly but???

hey guys, this sounds really silly but is there some element to this? I'm from India and almost all Silver Arowanas we buy here are imported from the south east. I was talking to a flowerhorn breeder here about breeding silvers and he said the farms that breed them actually neuter them by adding some chemical into the water when they are very little, say when they are past 10 days. I've been wondering cos breeders in India have been able to breed almost every other fish they can but not Arowanas (Silvers or Asian or Aus).. Any comments on this guys..