It is a Maylandia zebra. Most of the females are OB at that location. They even have a yellowish tinge.Fogelhund said:It should be Metriaclima zebra http://malawi.si/Malawi/Mbuna/Maylandia ... ef%27.html
That said, I've never seen a yellow one like that. Typically a yellow OB, is Zebra Gold, but they don't come from that side of the lake.