The fissi (Sarotherodon caroli) is a species of cichlid endemic to Lake Barombi Mbo in western Cameroon. This species can reach a length of 18.6 centimetres (7.3 in) SL. It is threatened because of pollution and sedimentation due to human activities, and potentially also by large emissions of carbon dioxide (CO₂) from the lake's bottom (compare Lake Nyos).