Fish
Demasoni Cichlid
Pseudotropheus demasoni · also called demasoni mbuna
Barely the length of a finger yet ready to take on anything that strays too close, a demasoni cichlid patrols its tiny patch of Lake Malawi rock, proof that among mbuna cichlids, aggression has little to do with size.
Overview
The demasoni cichlid, Pseudotropheus demasoni, is a small, intensely territorial fish native to a small number of rocky shoreline sites within Lake Malawi in East Africa. Its outsized aggression relative to its modest size, unusually restricted natural range compared with most mbuna, and vivid blue-and-black barred pattern make it one of the most behaviourally demanding yet visually striking small cichlids kept in aquariums worldwide.
Small fish, outsized reputation
Few fish in the mbuna group have a reputation for aggression as disproportionate to their size as the demasoni cichlid, whose relentless territoriality means keepers must plan carefully around large group numbers just to keep the peace.
Status
Least Concern, though naturally restricted to a small number of rocky sites within Lake Malawi, leaving it more vulnerable to localised habitat disturbance than more widespread mbuna.
Demasoni Cichlid: common questions
Why is the demasoni cichlid considered so aggressive despite its small size?
This species is considered one of the most aggressive fish, inch for inch, within the already often-territorial mbuna group, a reputation that has little to do with its modest adult size of only about 6 to 8 centimetres and everything to do with its intensely territorial temperament.
Why are demasoni cichlids kept in large groups?
This species is typically kept in large groups within a spacious aquarium, since spreading its aggression across many individuals prevents any single fish from being singled out and relentlessly targeted, a management strategy commonly used for particularly aggressive mbuna species.
Is the demasoni cichlid found throughout Lake Malawi?
No, this species has an unusually restricted natural range compared with many other mbuna, occurring naturally only around a small number of specific rocky areas within Lake Malawi rather than being widely distributed across the lake's shoreline.
How can you identify a demasoni cichlid?
This species displays vivid blue body colouring crossed by bold black vertical bars, a striking and fairly consistent pattern across the species that helps distinguish it from other similarly sized Lake Malawi mbuna cichlids.