Tanganicodus irsacae Breeding Guide

Breeding Tanganicodus irsacae, the smallest Tanganyikan goby cichlid: pair bonding, biparental mouthbrooding and the female-to-male fry transfer.

Overview

Tanganicodus irsacae is the smallest of the Lake Tanganyika goby cichlids, reaching about 2.8 inches (7 cm) standard length (Seriously Fish). It is a bi-parental mouthbrooder in which both parents share incubation, and breeding is rated difficult - not recommended for beginners due to its sensitivity and specific requirements (Seriously Fish). The genus belongs to the eretmodine goby cichlids, which uniquely transfer the brood between female and male (peer-reviewed review).

Sexing

Sexing is difficult by external appearance. Seriously Fish recommends buying young fish and allowing them to pair off naturally rather than introducing an adult male and female together.

Conditioning

Condition breeders on a varied diet suited to a grazing micro-predator. Strong oxygenation is essential, in keeping with the surge-zone rocky habitat the genus occupies (Seriously Fish).

Breeding Setup

Provide a rocky tank with vigorous flow and high oxygen. Once a pair has formed they remain together for life (Seriously Fish). Breeding is reported at a pH of 8.2-9.0 and 77-80 deg F (25-27 deg C).

Spawning Behavior & Trigger

The female selects and cleans a rock surface; after displays and circling she lays a few eggs, the male fertilises them, and she picks them up in her mouth, repeating until all eggs are laid (Seriously Fish). She mouthbroods for over two weeks, not eating, and is easily spotted by her distended mouth (Seriously Fish).

Egg & Fry Care

After hatching, the female transfers the fry to the male's mouth at the spawning site, with 1-2 fry gently blown out by the female and picked up by the male at a time (Seriously Fish). The male then incubates for 5-10 days before releasing them over several hours. Newly released fry accept brine shrimp nauplii and powdered spirulina flake from day one, and growth is slow, as with many Tanganyikan species (Seriously Fish).

Common Challenges

Maintaining strong oxygenation and current, establishing a compatible pair, and supporting slow-growing fry make this a demanding, advanced project. The small adult size also means brood numbers are limited.