德氏拟丽鱼

Overview

A small but exceptionally combative mbuna, Pseudotropheus demasoni may challenge much larger fishes. Its close association with rock surfaces includes sideways or upside-down swimming while exploring crevices.

Distribution & habitat

Its restricted range centers on Pombo Rocks off the Tanzanian shore of Lake Malawi. Shallow rocky areas are occupied, with fish seldom venturing into open water.

Aquarium setup

Even a tank around 120 by 45 by 38 cm is only a minimum starting point. Cover much of the sandy floor with secure rockwork containing numerous caves and crevices. Extensive open swimming space is less important, though retain small sand patches and flat spawning surfaces.

Diet & feeding

Emphasize vegetable foods such as spirulina-based flakes, blanched spinach, and nori, with live and frozen supplements. Beef heart and other red meats are unsuitable.

Behaviour & compatibility

Avoid peaceful peacocks and utaka. Robust mbuna with different patterning are more plausible companions, but conspecific aggression remains severe in both sexes. Larger groups may distribute aggression without preventing subordinate males from being killed. Be prepared to separate vulnerable individuals.

Sexual dimorphism

Both sexes share the same basic colors and pattern. Mature males tend to be slightly larger and more territorial, but visual sexing remains difficult.

Breeding

A juvenile group of six to eight can be raised for breeding, around 25–26.5 °C and pH 8.2–8.5. The male courts at a flat surface or pit. The female collects fertilized eggs and incubates them for approximately three weeks without feeding. Disturbance risks brood loss. Released fry take brine shrimp nauplii, but aggression starts early; monitor them and separate individuals as needed.