Gymnogeophagus labiatus Breeding Guide
How to breed the thick-lipped eartheater Gymnogeophagus labiatus, a maternal mouthbrooder of the Merín basin whose females carry the brood.
Overview
Gymnogeophagus labiatus is a subtropical eartheater from the Merín basin, recognised by its very thick lips. It is a mouthbrooder, described as the most ancestral of the mouthbrooding Gymnogeophagus, with females holding the brood. Like the rest of the genus it needs cool seasonal conditions for breeding.
Sexing
Males dominate multiple breeding females and patrol the territory; in this polygynous structure the male takes no significant role in direct brood care beyond defending the territory. Males develop the brighter breeding dress and adipose hump typical of the genus's mouthbrooders.
Conditioning
A varied diet within a stable, mature aquarium conditions adults. Because the genus relies on seasonal cycling, reproducing a cool period and subsequent warming is the central conditioning step rather than feeding alone.
Breeding Setup
- A cool overwintering period followed by warming; spawning preference for this species is reported around 23-26 °C.
- A fine sand bed suited to a sifting eartheater, with flat surfaces for egg deposition.
- Refuges for the brooding female, since brooding fish defend a clutch.
- Enough space to hold a dominant male with several females in a polygynous group.
Spawning Behavior & Trigger
Warming after a cool period triggers reproduction. The female lays a modest clutch (on the order of a few dozen eggs) on a cleaned rock or surface; the eggs remain there until they are about to hatch, roughly two days later, when the female takes them into her mouth. The dominant male patrols and may breed with several females.
Egg & Fry Care
The female guards the clutch, chasing away intruders including the male, then mouthbroods the larvae. The fry are released after roughly 10 to 12 days and can be reared on Artemia nauplii, with the female continuing to shelter them.
Common Challenges
Providing a genuine seasonal cool period is essential, and the polygynous structure means females may be harassed unless given refuges. The record lists this species as a mouthbrooder, matching the maternal mouthbrooding described by the sources.