Upside-Down Catfish care guide
Upside-Down Catfish (Synodontis nigriventris) — minimum tank 80 L, temperature 22-27 °C, pH 6-7.5.
Compiled by Aquairi from published sources · Published · Updated
Overview
The Upside-Down Catfish (Synodontis nigriventris) is a small mochokid catfish from the Congo basin, named for its habitual inverted swimming position. The ventral surface is darker than the dorsal surface — a reversal of normal countershading consistent with its inverted lifestyle.
Taxonomy
- Family: Mochokidae
- Genus: Synodontis
- Scientific name: Synodontis nigriventris
Habitat
Native to slow-flowing tributaries and flooded forests of the central Congo basin in the Democratic Republic of the Congo, often resting beneath overhanging branches and submerged wood.
Tank requirements
- Minimum tank volume: 80 L (21.1 US gal)
- Adult size: 7-10 cm
- Temperature: 22-27 °C (72-81 °F)
- pH: 6-7.5
- GH: 4-15 °dGH
- Water flow: moderate
- Lifespan: 5-10 years
- School size: ≥3 individuals
Diet
An omnivore. Offer sinking pellets, flakes and live or frozen foods (bloodworms, daphnia). The species feeds easily from the underside of the water surface or from leaves.
Compatibility
A peaceful shoaling catfish best kept in groups of three or more in a planted aquarium with hiding places. Compatible with peaceful African and soft-water community species; avoid pairing with aggressive cichlids.
Breeding
Cave-spawning has been reported in captivity. Spawning occurs in narrow cavities in soft, slightly acidic water; the male guards the brood.
Upside-Down Catfish (Synodontis nigriventris) Breeding Guide
Overview
Synodontis nigriventris is native to the Congo Basin of Cameroon, the Democratic Republic of the Congo and the Republic of the Congo, reaching about 10 cm standard length. Captive spawning has been achieved in aquaria, but published details are scarce. In nature the species breeds during the rainy season and migrates to flooded areas, so seasonal shifts in water temperature and chemistry are the likely natural spawning cues.
Sexing
Males are reported as thinner and darker in colour than females. Because the fish is small, the genital-papillae sexing method used in larger Synodontis cannot be reliably applied.
Conditioning
Maintain a group on a varied diet so that prospective spawners build condition. The species is omnivorous and accepts prepared and live or frozen foods; well-fed, mature adults are the starting point for any breeding attempt.
Breeding Setup
Sources conflict on where eggs are deposited, with reports of both depressions in the substrate and caves formed by piping, so providing both options is recommended. Keep water within the species' tolerated range of roughly 24-28 °C and pH 6.0-7.5.
Spawning Behavior & Trigger
A large water change with cooler water is suggested as a starting point for inducing spawning, simulating the temperature and chemistry changes of the natural rainy season. Up to 450 eggs may be deposited in a single spawning.
Egg & Fry Care
Fry become free-swimming after about 4 days. They initially orient upright and only adopt the characteristic inverted posture at around 7-8 weeks of age (about two months). Newly free-swimming fry can be offered brine shrimp nauplii or microworm as first foods.
Common Challenges
Published breeding accounts are very scarce, so reliably triggering a spawn is the main obstacle. The conflicting reports on spawning site mean results can be inconsistent, and the small size of the fish makes confident sexing difficult before conditioning.