African lakes have produced striking variation in cichlid fish fauna. Lake Tanganyika, whose age is estimated at 9 to 12,000,000 years, is the oldest East African lake and hides morphologically, genetically and behaviorally diverse group cichlid fish. Many of the more than 200 described species is divided into geographically and genetically distinct populations that differ primarily in their co...

It has been suggested that intrasexual competition can be a source of negative frequency-dependent selection, causing agonistic character displacement and facilitating speciation and coexistence of (sibling) species. In this paper we synthesise the evidence that male-male and female-female competition contributes to cichlid diversification, showing that competition is stronger among same-colour...

Ecological speciation is well-known from adaptive radiations in cichlid fishes inhabiting lentic ecosystems throughout the African rift valley and Central America. Here, we investigate the ecological and morphological diversification of a recently discovered lotic predatory Neotropical cichlid species flock in subtropical South America. We document morphological and functional diversification u...

The transfer of the genomic resources developed in the Nile tilapia, Oreochromis niloticus, to other Tilapiines sensu lato and African cichlid would provide new possibilities to study this amazing group from genetics, ecology, evolution, aquaculture, and conservation point of view. We tested the cross-species amplification of 32 O. niloticus microsatellite markers in a panel of 15 species from ...

in this study, we have investigated the effects of mix of tomato (solanum lycopersicum) & carrot) daucus carota ( and red bell pepper )capsicum annuum( as a natural pigment source and astaxanthin as synthetic pigment sources on the skin colour of cichlid fish (astronotus ocellatus sp., agassiz, 1831), which are generally white with red patches in the dorsal skin. the fish were fed diets con...

The cichlid species flocks of the great East African lakes represent the most diverse assemblages of freshn'ater fishes in the world. Lake Tanganyika is by far the oldest of the three major East African rift lakes with an estimated age of about 9 to 12 million years (Cohen et al., 1993). Its geological history is relatively well known (reviewed in Tiercelin and Mondeguer, \997). The lake is for...

again somewhere and celebrate our traditional barbecue on the roof !!! Johannes set foot on the shores of the Great East African Lakes. Luckily, Darwin stumbled over some remote Islands in the Pacific Ocean instead and found some finches there, and later wrote his famous books. I think we are very lucky that we have something like an Evolutionary Theory today. For if Darwin had seen the splendi...