What is "nsess"

The nsess (Stomatepia mariae) is a species of cichlid endemic to Lake Barombi Mbo in western Cameroon. It can reach a length of SL. It can also be found in the aquarium trade. It is threatened because of pollution and sedimentation due to human activities, and potentially also by large emissions of carbon dioxide (CO) from the lake's bottom (compare Lake Nyos).