The reason they are not as common is demand.
Mpimbwe is still the leader as far as Tanzanian's go.
It can be argued if mpimbwe are the best looking, its pretty close, but name recognition is what the reason is.
There is not alot of market for Tanzanians anymore, so that means not alot of room for alot of Tanzanian variants.
THe market at this time is Zaire, not alot of profit with Tanzanians any more due to the limited demand.
So if you are going to bring in Tanzanaians, then you will bring in what will sell.
Its a good looking fish, just close to blue of mpimbwe, bit more high bodied.
Both are stated to be collected at Samazi.
But they look different in terms of coloration and mask.
There is overlapping features in frontosa, so there would also be members of each that look identical to the other, and very different.
Its possible they are the same fish, but when collected those that are high bodied with a certain masks or sold as one thing, and those that are less high bodied or sold as another, even if siblings.
There are often different discus found under the same log, and sold as different types.
Could be that there are more than one collection point at samazi, say a mile away.
depending on what fence your are on, they could be called different or the same.
Most collection points are secret, and some are not true to hide them from other collectors.
Samazi and Bismark are the same fish. It was just marketed differently by different collectors. Bismark and Mpimbwe look the same. You could take 100 frontosa experts put them in a room and ask them to point out the bismarks, ikola and mpimbwe and they wouldn't be able to tell. Yes, some mpimbwe are more blue that bismark, but other bismark are more blue than mpimbwe. Mpimbwe is the most well known, which is the reason why it is so popular. People want name recognition and reputation. I've kept ikola, bismark, mpimbwe, and zambians and they are all very similar frontosa.
I hate dragging up old threads, but this one caught my eye. I had a group of bismarks. My dom male showed colors that some Zaire's lack. Sadly I lost my colony on Christmas Eve this past year. We were gone, and heat was down in house as we werent due back for a few days and the heater died on tank. You can only imagine the rest. I havent replaced them, but am looking at some Mobas. The 220, just weeks ago was filled back up and is housing a bunch of malawi's. Here are some past pics. RIP fishes.