we call those the royal, as they could possibly be the true nile perch, they come out of congo, but don't grow as large, and fast, and usually have very high contrasting colors.
in the past we've received them from Nigeria, they only exhibit this color when really small, but typically will fade into a uniformly brown/gray color, and grow much faster. I was told those may actually be a hybrid, and introduced into the wild as food source, one of the original ones to cause the depletion and eco imbalance. of course I have no way of proving this, but I do as well have years of experience with this group, Lates.
I've kept Lates microlepis, and angustifron as well, and the Marine ones, L. japonicus, calcarifer
As for your mariae, I would love to see a picture of it, as I have not seen a mariae since the group that I saw at Shedd aquarium back in the 1990s. The ones I thought were mariae I believe turned out to be microlepis. The mariae I saw at shedd had big eyes, and were swift swimmers, not like most others that are more stationary.
Wes
thats a common Lates niloticus and a very nice specimen too
although i own one id hate too see Lates mariae (the other large afro perch) becoming more common in trade until more research is done into there existing populations and fisherman's reports of steep declines....