Maylandia callainos

Maylandia callainos is a small species of cichlid fish found naturally only in Lake Malawi, where it occurred in the waters of Nkhata Bay. It is known by several common names, including cobalt zebra, cobalt blue mbuna and cobalt blue zebra cichlid. Adults can reach about 8 centimetres in standard length. The species has been introduced to other locations beyond its original bay, and it is also sold in the aquarium trade. It was formerly named Pseudotropheus callainos, and that older name is still often used in the scientific literature, so readers searching older papers should look for both names.