Asiatic Brown Catfish, Live (Heteropneustes fossilis) — > 12cm

Overview

The freshwater fish for sale UK species Heteropneustes fossilis, commonly known as the Asiatic brown catfish or stinging catfish, is a hardy but potentially dangerous air-breathing catfish native to South Asia. This robust species is found across India, Bangladesh, Pakistan, Nepal, Sri Lanka, Bhutan, Myanmar, Thailand, and has been introduced to western Iran. With an adult size reaching up to 45 cm, this large predatory catfish requires a spacious aquarium and experienced care. Available from Tropical Fish Co, Heteropneustes fossilis is prized by advanced aquarists for its unique biology, hardy nature, and fascinating air-breathing behavior. However, prospective owners must be aware of its sharp pectoral spines, which can deliver a painful sting, making careful handling and robust tankmates essential. This species is best suited to buy tropical fish UK enthusiasts with experience in managing large, semi-aggressive catfish for sale UK.

Appearance

Heteropneustes fossilis displays a long, eel-like body with a dark brown to olive-green coloration that provides excellent camouflage in murky water. The skin is smooth and scaleless, covered in a protective mucus layer. The head is broad and flattened, with a wide mouth equipped with small teeth. The barbels around the mouth are long and highly sensitive, aiding in locating prey in low-visibility conditions. The pectoral fins are equipped with sharp, serrated spines that can inflict a painful sting—a key defensive adaptation. Healthy specimens show clear eyes, smooth skin, and a robust, muscular body. This species can grow impressively large, so ensure adequate tank space from the outset.

Natural Habitat

In the wild, Heteropneustes fossilis inhabits slow-moving rivers, ponds, swamps, and flooded rice paddies across South Asia. The natural environment features warm, slightly acidic to neutral water with soft, muddy substrates and abundant aquatic vegetation. These fish are adapted to low-oxygen environments and can survive in stagnant or poorly oxygenated water by gulping air at the surface using a specialized air-breathing organ. During the dry season, they burrow into mud to survive desiccation. Their natural habitat is often murky with heavy vegetation and submerged debris, providing cover from predators and ambush points for hunting small fish and invertebrates.

Aquarium Setup

A minimum 300-litre aquarium is essential for Heteropneustes fossilis, with larger tanks strongly recommended for long-term health and growth. Use a soft substrate such as fine sand to allow natural burrowing behavior. Provide plenty of hiding places using large pieces of driftwood, PVC tubes, and caves to create secure resting spots. Avoid sharp or rough décor that could damage the fish's smooth, scaleless skin. Robust filtration is necessary to handle the heavy bioload produced by this large, carnivorous species. Ensure the tank has a tightly fitted, weighted lid, as these fish are powerful and can easily dislodge loose covers. Subdued lighting and calm water flow are preferred, replicating their natural low-energy habitats.

Water Parameters

Asiatic brown catfish thrive in water with a pH of 6.0-7.5 and temperatures between 22-28°C. Maintain excellent water quality with regular partial water changes of 30-40% weekly, keeping ammonia and nitrite at zero and nitrate below 20 ppm. Soft to moderately hard water is preferred. Use a reliable heater and thermometer to prevent temperature fluctuations. Ensure strong filtration and good oxygenation, though this species is a facultative air-breather and must have access to the water surface. Despite their tolerance for poor water conditions in the wild, captive specimens thrive best in clean, well-maintained water, which reduces stress and prevents bacterial infections.

Feeding

Heteropneustes fossilis is a carnivore that requires a varied meaty diet. Offer sinking carnivore pellets as a staple, supplemented with frozen or live foods such as bloodworms, earthworms, blackworms, insect larvae, shrimp, and fish flesh. Larger specimens may accept whole thawed fish or seafood. Feed once daily in the evening, as these fish are most active at dusk and during the night. Avoid overfeeding, which can lead to obesity and poor water quality. A protein-rich diet supports healthy growth, robust immune function, and maintains the fish's natural hunting instincts. Be cautious when feeding—this species has sharp spines and should never be hand-fed.

Behaviour

Heteropneustes fossilis is a semi-aggressive, nocturnal predator that spends most of the day hiding under cover or resting on the substrate. As evening approaches, they become active hunters, using their sensitive barbels to locate prey in the dark. They are solitary and territorial, especially as they mature. Their air-breathing ability is fascinating to observe—they rise to the surface periodically to gulp atmospheric air, which is processed by a specialized respiratory organ. Despite their predatory nature, they are not hyperactive and will coexist peacefully with appropriately sized, robust tankmates. However, any fish small enough to fit in their mouth will be considered prey.

Tank Mates

Suitable tank mates for Heteropneustes fossilis include large, robust, non-aggressive fish of similar size such as large peaceful bottom dwellers, fast midwater fish, and other species too large to be swallowed. Avoid small fish, shrimp, snails, slow-moving species, long-finned fish, and very aggressive territorial species that may provoke conflict. Due to their size and predatory nature, many aquarists choose to keep them in a species-only setup or with only a few carefully selected large companions. Ensure ample space and hiding spots to minimize territorial disputes. This Indian catfish is best suited to experienced aquarists comfortable managing large, semi-aggressive freshwater catfish UK species.

Breeding

Breeding Heteropneustes fossilis in home aquariums is uncommon and typically achieved only with large, well-conditioned adults in very spacious tanks. Successful spawning may require seasonal cues such as warm water, heavy feeding, increased water flow, and softer water to simulate monsoon conditions. The species is often bred commercially using hormone injections, which is beyond the scope of most home aquarists. Little detailed information is available on natural spawning behavior in captivity. Fry, if produced, would require very fine foods such as infusoria or liquid fry food initially, progressing to larger live foods as they grow. Breeding attempts require patience, space, and careful observation.

Why Buy from Tropical Fish Co

Tropical Fish Co is your trusted source for healthy, well-acclimatized airbreathing catfish for sale UK, including the fascinating Heteropneustes fossilis. Each fish is quarantined, health-checked, and carefully acclimatized before dispatch, ensuring you receive robust, disease-free specimens ready to thrive in your large aquarium. Our expert team provides personalized care advice, aquarium setup guidance, and ongoing support to help you succeed with these challenging but rewarding stinging catfish. With secure packaging, next-day delivery across the UK, and a commitment to responsible sourcing, Tropical Fish Co is the best place to buy live catfish UK online. Whether you're an advanced aquarist seeking a unique predator or building a biotope tank, our Asiatic brown catfish deliver both intrigue and challenge.