This fourth, completely revised edition of the definitive study of Lake Malawi cichlids discusses and illustrates more species (843 species of which 822 are shown in photos) than any previous publication. Basing his study on more than 1500 hours of underwater observations all over the lake (36 expeditions), the author characterizes the species by their habitat preference, distribution, and coloration. More than 1750 excellent photographs — many never published before — illustrate the cichlid fauna of the entire lake. Almost all of these photographs were taken in the lake and show the fishes in their natural habitat.