as you can see in the photo this royal blue has no red in fins
the one in link is described as red vented royal blue
as said we can only rely on the honesty of who we get the fish off, and they are probably relying on what they are told, and so on etc
short of going to the lake and catching your own fish we have to go by doing research and using fish that match the description for the species or variant
i read an article on the net recently that recounted a story that in the 70's some local exporters at lake malawi, established colonies of some of the more sought after peacock species closer to their base to make it easier to find and catch them for export
has this led to some further mixing of genes