Walking Catfish (Clarias batrachus) — 5,5-7cm

Overview

The walking catfish Clarias batrachus is a hardy, air-breathing predator catfish native to Southeast Asia, renowned for its unique ability to move across dry land using pectoral fin-assisted locomotion. This robust species can reach up to 45 cm in adult size and is highly adaptable, surviving in a wide range of water conditions. Available for sale UK from Tropical Fish Co, the albino walking catfish variant is particularly popular among advanced aquarists for its striking appearance and bold personality. However, prospective owners must be prepared for its aggressive temperament, large size, and powerful escape-artist tendencies. This species requires a secure, spacious aquarium with a tightly fitted lid and is best suited to experienced buy tropical fish online UK enthusiasts comfortable managing large, predatory freshwater catfish.

Appearance

Clarias batrachus displays a long, eel-like body with smooth, scaleless skin covered in a protective mucus layer. Wild-type specimens are typically dark brown to olive-grey, while the popular albino clarias batrachus variant is pale cream to white with pink eyes. The head is broad and flattened, with a wide mouth equipped with small, sharp teeth. Four pairs of sensitive barbels surround the mouth, aiding in locating prey in murky water. The pectoral fins are robust and spine-reinforced, enabling the fish to "walk" short distances over land. Healthy specimens show clear eyes, smooth skin, and a muscular, robust body. This species grows large quickly, so plan tank size accordingly.

Natural Habitat

In the wild, Clarias batrachus inhabits slow-moving rivers, ponds, swamps, marshes, and flooded rice paddies across Southeast Asia. The natural environment features warm, often oxygen-poor water with soft, muddy substrates and dense aquatic vegetation. These fish are highly adapted to survive in stagnant, low-oxygen conditions by gulping air at the surface using a specialized labyrinth-like respiratory organ. During the dry season, they can travel overland between water bodies, using their pectoral fins to propel themselves across mud and wet grass. This remarkable adaptation allows them to survive droughts and colonize new habitats, making them one of the most resilient tropical fish UK species.

Aquarium Setup

A minimum 450-litre aquarium is essential for Clarias batrachus, with even larger tanks recommended for long-term health and growth. Use a soft substrate such as fine sand to allow natural burrowing behavior. Provide large hiding places using robust driftwood, PVC tubes, and caves that can withstand the fish's powerful movements. Avoid sharp or rough décor that could damage the smooth, scaleless skin. Strong, oversized filtration is critical to handle the heavy bioload produced by this large, carnivorous species. A tightly fitted, weighted, and secured lid is absolutely essential, as walking catfish are notorious escape artists and can survive out of water for extended periods. Subdued lighting and minimal water flow are preferred.

Water Parameters

Walking catfish are remarkably tolerant of a wide pH range (6.0-8.0) and temperatures between 22-28°C. Despite their tolerance for poor conditions in the wild, captive specimens thrive best in clean, well-maintained water. Maintain water quality with regular partial water changes of 30-40% weekly, keeping ammonia and nitrite at zero and nitrate below 30 ppm. Use a reliable heater and thermometer to prevent temperature fluctuations. Ensure the fish has constant access to the water surface for air-breathing, as this is essential for respiration. Strong filtration and regular maintenance are critical to managing the high waste production of this large predatory fish for sale UK.

Feeding

Clarias batrachus is a carnivore that requires a varied, protein-rich diet. Offer quality sinking carnivore pellets as a staple, supplemented with earthworms, insect larvae, shrimp, fish flesh, and occasional frozen foods. 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, bloating, and poor water quality. A high-protein diet supports healthy growth, robust immune function, and maintains natural predatory behavior. Be cautious when feeding—this species can be aggressive and should never be hand-fed.

Behaviour

Clarias batrachus is an 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 highly territorial and will aggressively defend their space from other bottom-dwellers. Their unique air-breathing behavior 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 and aggressive nature, they can become surprisingly tame and may recognize their keeper, approaching the front glass at feeding time. However, they are best kept alone due to their aggression and large size.

Tank Mates

Due to its aggressive temperament and predatory nature, Clarias batrachus is best kept alone in a species-only setup. If tankmates are attempted, only very large, robust fish in an oversized tank should be considered, and even then, compatibility is not guaranteed. Avoid small fish, shrimp, snails, slow-moving fish, long-finned fish, and any species that can fit in the catfish's mouth. Many aquarists find that solitary housing reduces stress and allows the fish to thrive without competition or aggression. This species' aggressive and predatory behavior makes it unsuitable for typical community aquarium fish setups and is best suited to advanced aquarists with experience managing large, territorial air-breathing catfish.

Breeding

Breeding Clarias batrachus in home aquariums is possible but uncommon. Spawning typically requires a very large tank, warm water, excellent conditioning with high-protein foods, and often seasonal cues such as increased water flow, temperature fluctuations, or softer water to simulate monsoon conditions. The species is often bred commercially using hormone injections, which is beyond the scope of most home aquarists. Successful home breeding requires patience, space, and careful observation. Fry, if produced, require very fine foods such as infusoria or liquid fry food initially, progressing to larger live foods as they grow. Breeding attempts should only be undertaken by experienced aquarists with appropriate facilities.

Why Buy from Tropical Fish Co

Tropical Fish Co is your trusted source for healthy, well-acclimatized albino walking catfish for sale UK, including the fascinating albino clarias batrachus variant. 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 air breathing catfish for sale UK. With secure packaging, next-day delivery across the UK, and a commitment to responsible sourcing, Tropical Fish Co is the best place to buy tropical fish online UK for advanced aquarists. Whether you're seeking a unique predator or a bold centerpiece fish, our albino walking catfish deliver both intrigue and challenge.