Malawi eyebiter (Dimidiochromis compressiceps) is a species of fish in the family Cichlidae. This predatory cichlid is endemic to Lake Malawi. This species can be found in Malawi, Mozambique, and Tanzania. It is endemic to Lake Malawi, Lake Malombe and the upper Shire River in East Africa. Dimidiochromis compressiceps can reach a length of about 9.1 in. The females are considerably smaller than males. The body is narrow and laterally compressed minimizing its visibility. The mouth is quite large and jaws are relatively long. This large and impressive cichlid normally shows a whitish-silver body with a brown horizontal stripe along the sides, from the snout to the tail. Sexually mature males put on a dazzling metallic blue with reds and oranges on their fins. This species once was regarded as a specialist, feeding on eyes of other fishes (hence the common name eyebiter), but such behavior has never been observed in the wild. Though the eyeballs of cyprinids have been found in gut samples taken from this species, it is not clear whether this is normal feeding behaviour or occurs only when food is scarce. Another suggestion is that the Malawi eyebiter might rip out the eyes of other fishes so that it is easier to overcome the incapacitated prey. Dimidiochromis compressiceps may be a non-territorial open-water predator, but also an ambush predator. These cichlids are mainly piscivorous, especially on small fish and are nearly unique among fish species in that they that swallow their prey tail-first instead of flipping it around head-first.
The territorial males excavate a shallow depression in the sand as spawning site. Normally the spawning site sits between beds of aquatic plants but occasionally it is placed underneath or in the vicinity of a submerged tree trunk, or beneath an overhanging rock. The courting males display their more intense colours and vigorously lead the females to the spawning site. The female lays her eggs into the spawning site and then immediately takes them into her mouth. The males have markings on their anal fins which resemble the eggsand which attract the female. While they are mouthbrooding the females are solitary, holding the young in their mouths for around 3 weeks.
In the aquarium Dimidiochromis compressiceps usually prefer to swim out in the open unlike the more common “Mbuna”. They can become quite aggressive during spawning, vigorously defending their territory from all intruders. A single male should be kept in a harem-style environment with multiple females, as this diverts his aggression from any particular female. They should be housed in at least a 100-gallon tank to accommodate their large size and aggressive behaviour. Also, any other fishes that are smaller in size and less assertive should be avoided as they are likely to be eaten. This species also is likely to behave aggressively towards other similarly colored species. As with all cichlids of Lake Malawi, they prefer hard, alkaline water.
Fish size: 10″
Min tank size: 100 Gallons