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As a general rule of thumb, mbuna that show different colors between sexes have males that tend toward blues and blacks as the base color and females that tend toward yellow tones as the base color. However, some species do not show any color difference between sexes and others have plain gray females and males that gain color as they mature, so that often quoted "rule of thumb" is hardly accurate. Kenyi are totally opposite of the "rule". All kenyi start out striped blue and females stay blue into maturity, while dominant males turn yellow.
The males dorsal fin comes to a point, where the female is more rounded, the male has a egg spot on fin under tail, mine mated with a new female within minutes of introducing her, the male shakes his egg spot in front of the female while she is trying to pick up eggs and he fertilizes the eggs in her mouth, here is a pic of yellow male and blue female.