Female mate choice has strong experimental support as a diversifying force in the speciation of the haplochromine cichlid fishes of Lake Malaŵi, Africa. Somewhat less understood is the role that male–male aggression might have played in the evolution of new species of these fishes. In the rock‐dwelling haplochromines of Lake Malaŵi, primarily territory‐holding males successfully court females; by determining which males gain t...