Breeding Petrochromis famula

Breeding guide for Petrochromis famula: a maternal mouthbrooder from northern Lake Tanganyika that holds up to 60 eggs for about four weeks on a low-protein diet.

Overview

Petrochromis famula is endemic to the northern end of Lake Tanganyika, where solitary adults graze biocover from rocks with specialised rasping mouthparts. FishBase gives a maximum length of around 15 cm and confirms maternal mouthbrooding, with females of roughly 8.7-9.5 cm holding eggs and larvae of up to about 2 cm. Seriously Fish documents the species as a maternal mouthbrooder, providing detailed captive breeding data.

Sexing

According to Seriously Fish, males are more colourful and develop pointed dorsal, anal and pelvic fins, while females are plainer. Because the differences are gradual, sexing is most reliable in adult, well-conditioned specimens.

Conditioning

Diet must be high in fibre and low in protein. Seriously Fish recommends vegetable matter such as spirulina flake and blanched spinach or lettuce as the staple, with only small supplements of brine shrimp, Daphnia or bloodworm. This mirrors the wild diet of rasped algae and protects the digestive system from bloat.

Breeding Setup

A rocky aquascape with caves and open swimming areas over sand suits the species. The recommended breeding arrangement is a single male with several females. Aggression toward conspecifics is high, but Seriously Fish notes it reduces in busier, well-stocked tanks with robust companions; interspecific aggression is more pronounced in species-only setups. Hard, alkaline water at 24-27 °C is appropriate.

Spawning Behavior & Trigger

The female takes the eggs into her mouth, where they are fertilised, and then carries the brood. Stable water quality and steady conditioning on a fibre-rich diet drive spawning readiness, while the dominant male courts females within his grazing territory.

Egg & Fry Care

Seriously Fish reports the female holds up to about 60 eggs for around four weeks without feeding. Released fry are large, around 1 cm, and accept adult food immediately, growing rapidly when fed frequently. Fry should be kept on the same fibre-rich, low-protein diet as the adults.

Common Challenges

The main difficulties are managing conspecific aggression and avoiding the digestive bloat associated with excess protein. Providing enough space, the right tankmates and a strictly herbivorous diet are key to consistent spawns.