Blue Congo Tetra (greeni) Breeding Guide
Breeding the Blue Congo Tetra (Bathyaethiops greeni): a Congo-tetra-pattern soft acidic egg-scattering spawn; species-specific captive data are scarce.
Overview
The Blue Congo Tetra (Bathyaethiops greeni) is an African characin of the family Alestidae from the middle Congo River basin, reaching about 6 cm and living in freshwater at 22-28 C (FishBase). It is an egg-scattering schooler; species-specific captive breeding data are scarce, so the genus-pattern points below are drawn from the closely related Congo Tetra (Phenacogrammus interruptus) and flagged accordingly.
Sexing
Detailed dimorphism is not well documented for B. greeni. In the related Phenacogrammus, males are larger, more colourful and develop extended fins, while females are plainer and fuller; a similar pattern is expected here but should be confirmed by observation.
Conditioning
Following the Congo Tetra approach, condition fish on live and frozen foods and select the best-coloured male and the fattest, ripest female before moving them to a breeding tank.
Breeding Setup
- A separate, dimly lit aquarium with soft, acidic water (Congo Tetra pattern).
- Temperature about 22-28 C, the species' tropical range (FishBase).
- pH below neutral and soft hardness, with clumps of plants to induce spawning.
- A mesh base or fine-leaved plants so scattered eggs fall out of reach of the adults.
Spawning Behavior & Trigger
By the Congo Tetra pattern, after chasing by the male the pair spawn side by side with a quivering motion, scattering eggs; up to around 300 eggs may be produced over several days, though 100-200 is more typical. Subdued light and a morning trigger are commonly reported. Remove the adults once spawning ends to prevent egg predation.
Egg & Fry Care
In the Congo Tetra, eggs hatch in about 6 days. After yolk-sac absorption the fry are offered infusoria, then brine shrimp nauplii or microworm after a couple of days; alestid fry tend to be relatively slow growing.
Common Challenges
The lack of confirmed species-specific breeding reports means the protocol is inferred from the Congo Tetra. Soft, acidic water, dim lighting and prompt removal of the parents are the principal requirements.