Adult male; red operculum morph (?) © Tino Strauss

Scientists from the University of Alberta, Canada, have ascertained that the pH of water influences both sex ratio and male phenotype in the kribensis, Pelvicahromis pulcher. Continue reading »

Mike Norén

Biologists from the University of Bonn have discovered that the dwarf cichlid Pelvicachromis taeniatus can perceive light in the near-infrared range, a phenomenon previously considered unlikely at best and which apparently helps them hunt prey in shallow African rivers. Continue reading »