umm no it's not sterilize . this stain is closer to a kml then a kamfa so it's fertile and some of the thai seller that i know breed them before and told me they got reallly high chance in fertilizing . and i got about 20 fry right now and they are def not weakBrynMichael;3238282; said:Males are sterile, just like SRT, BP, and Elec. Blue Ram males. Def. weaker genetics, although still a hardy fish. Most likely sterilized.