Placidochromis longimanus is a species of cichlid native to the southern portion of Lake Malawi, Lake Malombe and the Shire River. It is believed to only be found in areas vegetated with Ceratophyllum and Najas at approximately 10 metres (33 ft) in depth. This species can reach a length of 14.5 centimetres (5.7 in) TL. It is also important to local commercial fisheries as well as being found in the aquarium trade.