Tropheus annectens Breeding Guide

Breeding Tropheus annectens, a small Tanganyikan algal grazer: sexing, colony husbandry, maternal mouthbrooding and a strict herbivorous bloat-safe diet.

Overview

Tropheus annectens is a small Tropheus endemic to Lake Tanganyika, found on substrates of large fixed rock and reaching about 8 cm in length (Wikipedia). As a member of the genus it is an algal grazer with an underslung rasping mouth and a maternal mouthbrooder. Detailed species-level spawning data is sparse, so the breeding account here draws on the well-documented Tropheus genus pattern.

Sexing

Tropheus are difficult to sex, with sexes differing little in colour; reliable determination usually relies on venting (the genital papilla is pointed in males, rounded in females) or observing spawning behaviour within the colony. The record describes a yellow body with dark vertical bars.

Conditioning

Feed a strictly herbivorous diet of spirulina-based flakes and blanched greens, avoiding animal meat as recommended for the genus. Recorded parameters are a temperature of 24-27 C, pH 8.5-9.2 and GH 12-25 dGH; hard, alkaline water with frequent changes supports conditioning.

Breeding Setup

Keep as a colony rather than a pair to spread aggression; the record indicates a minimum school size of about 10 and a minimum tank of 350 L. Provide rockwork over a sand base to mimic the rocky biotope and give subordinate fish refuge.

Spawning Behavior & Trigger

As a maternal mouthbrooder the female takes the eggs into her mouth, where the male fertilises them in the manner typical of Tropheus. A settled, well-fed colony in stable hard water is the main spawning trigger.

Egg & Fry Care

Like other Tropheus the species produces small broods of relatively large fry, which the female carries orally for several weeks before releasing free-swimming young that can take brine shrimp nauplii and powdered foods. Isolating a holding female protects the limited brood.

Common Challenges

Tropheus are prone to digestive 'bloat' on the wrong diet, so the herbivorous regime and clean water are essential. Small brood size and the need for a stable colony make consistent breeding an advanced undertaking.