I will post more pictures.
Still, I wondering where this sytem originated. I was told there is no sexual dimorphism. Someone told me he could help me anesthetize the fish and examine its urogenital papilla, but I don't need to know that much. Since I have had the BGK, I've been calling it a male, mostly because that maintains the M/F ratio in my tank, and I have a female rope fish, so my youngest daughter wanted a male BGK and I played along.
ANY references as to where this sexing system for BGK originated???