Pyxichromis orthostoma Breeding Guide

Breeding Pyxichromis orthostoma, a predatory large-mouthed Lake Kyoga maternal mouthbrooder kept as a rare conservation strain.

Overview

Pyxichromis orthostoma (Haplochromis orthostoma) is a predatory large-mouthed haplochromine. Although often labelled a Lake Victoria fish in the hobby, FishBase and IUCN records place it in the Lake Kyoga system in Uganda (Lake Bisina and Lake Nawampasa), not Lake Victoria itself; it is listed as Vulnerable. It reaches about 9.1 cm SL. The species is a maternal mouthbrooder. Species-specific aquarium breeding accounts are scarce, so this guide applies the well-documented Victorian/Kyoga haplochromine breeding pattern.

Sexing

As in related haps, males are the colourful sex and females are duller and the sole investors in parental care, with mature males carrying egg-spot markings on the anal fin. Detailed sexual-colour description specific to this species is limited in the sources reviewed.

Conditioning

This is a piscivorous, large-mouthed predator that will rapidly swallow smaller fish, so condition adults on a meaty carnivore diet and never house them with fish small enough to be eaten. Stable hard, alkaline water supports spawning readiness.

Breeding Setup

Provide a roomy species tank with rockwork and open sand so a male can hold a territory, kept only with similar-sized or larger fishes. As a maternal mouthbrooder, a harem of one male and several females spreads out courtship aggression.

Spawning Behavior & Trigger

Spawning follows the haplochromine pattern: a male displays at his site, the female lays eggs and takes them into her mouth, and the male's anal-fin egg spots prompt collecting behaviour during which fertilisation occurs orally.

Egg & Fry Care

The female incubates the eggs and larvae in her mouth; haplochromines of this region typically hold for roughly two to three weeks before releasing free-swimming fry. Given the predatory nature of the species, fry should be reared apart and offered suitable small live foods. A holding female can be isolated to protect the brood.

Common Challenges

The chief practical issues are its predatory feeding (no small tankmates) and the scarcity of species-specific breeding data, so observe holding females directly and use genus-level figures as a guide. As a Vulnerable species of restricted range, maintain its captive line carefully and avoid hybridisation.