Eight Barbels Loach, Barred (Leiocassis siamensis) — 5,5-7cm

Overview

The tropical fish for sale uk species Leiocassis siamensis, commonly known as the eight barbels loach or barred catfish, is a peaceful, nocturnal bottom-dweller native to Southeast Asia, likely Thailand and surrounding Mekong and Chao Phraya drainage regions. Despite its "loach" common name, this species is actually a true catfish belonging to the Bagridae family. With an adult size of just 5 cm, this compact catfish is ideal for smaller community aquariums, though its nocturnal hunting habits mean it is best kept with tankmates of appropriate size. Available from Tropical Fish Co, Leiocassis siamensis is prized for its distinctive barred patterning, shy personality, and fascinating behavior. This rare tropical fish UK is perfect for freshwater fish for sale UK enthusiasts seeking an unusual, unobtrusive bottom feeder fish UK for planted community setups.

Appearance

Leiocassis siamensis displays a slender, elongated body with a pale cream to tan base color and bold, dark vertical bars running along the flanks, creating a striking barred pattern. The head is small and slightly flattened with a terminal mouth and eight long, highly sensitive barbels—four pairs extending from the mouth area—which help the fish locate food in low-light conditions. The eyes are small and positioned dorsally. The fins are translucent with subtle patterning, and the tail is moderately forked. Healthy specimens show clear eyes, smooth skin, intact fins, and a well-rounded belly, indicating good nutrition and water quality. Juveniles and adults display similar coloration and patterning.

Natural Habitat

In the wild, Leiocassis siamensis inhabits slow to moderate-flowing rivers, streams, and floodplains across Southeast Asia, particularly in Thailand and surrounding regions of the Mekong and Chao Phraya river basins. The natural environment features warm, slightly acidic to neutral water with soft, sandy or muddy substrates and abundant cover in the form of submerged wood, leaf litter, and overhanging vegetation. These fish are nocturnal, hiding in sheltered spots during the day and emerging at dusk to forage for small invertebrates and organic matter. Natural conditions include subdued lighting, calm to moderate water flow, and plenty of hiding places. Replicating these conditions in captivity promotes natural behavior and reduces stress.

Aquarium Setup

A minimum 60-litre aquarium is suitable for a small group of Leiocassis siamensis. Use a soft, fine sand substrate to protect their delicate barbels and ventral surface. Provide plenty of hiding places using driftwood, smooth stones, caves, PVC tubes, and dense plant cover such as Java fern, Amazon sword, and Cryptocoryne species. Floating plants like water sprite or Amazon frogbit help diffuse lighting and create shaded areas that replicate their natural habitat. Gentle to moderate filtration with minimal to moderate water flow is ideal. A tightly fitted lid is essential, as they may jump if startled. Subdued lighting enhances their comfort and encourages daytime hiding behavior, with activity increasing after dusk.

Water Parameters

Eight barbels loach thrive in water with a pH of 6.0-7.5 and temperatures between 24-27°C. Maintain excellent water quality with weekly partial water changes of 25-30%, keeping ammonia and nitrite at zero and nitrate below 20 ppm. Soft to moderately hard water is preferred, replicating natural Southeast Asian river conditions. Use a reliable heater and thermometer to prevent temperature fluctuations, which can stress the fish and compromise immune function. Ensure good oxygenation with gentle to moderate filtration, avoiding strong surface agitation. Stable, clean water conditions are critical for long-term health and to prevent common diseases such as ich and bacterial infections.

Feeding

Leiocassis siamensis 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, mysis, brine shrimp, chopped earthworms, and other small meaty foods. Feed once daily in the evening or after lights out, as these fish are most active after dusk and may not compete well for food during the day. Ensure food reaches the bottom of the tank and is accessible to these shy, nocturnal feeders. Avoid overfeeding, which can degrade water quality. A varied, protein-rich diet supports healthy growth, vibrant coloration, and robust immune function, ensuring your freshwater catfish remains active and healthy.

Behaviour

Leiocassis siamensis is a peaceful, nocturnal species that spends most of the day hiding under driftwood, in caves, or among plant roots. As evening approaches and lights dim, they become more active, gently foraging along the substrate and exploring the lower water column with their sensitive barbels. They are shy and easily startled by sudden movements or bright lighting. Despite their timid nature, they are non-aggressive and pose no threat to similarly sized tank inhabitants. However, they may prey on very small tankmates such as tiny shrimp or fry, so tankmate selection is important. Their calm temperament and small size make them ideal for peaceful, planted community aquariums.

Tank Mates

Ideal tank mates for barred catfish include small peaceful fish of similar size such as peaceful rasboras, small barbs, and other non-aggressive bottom dwellers like small peaceful catfish. Avoid very small fish, shrimp, and small crustaceans that may be mistaken for prey, as well as aggressive fin-nippers, highly territorial bottom dwellers, and fish small enough to be eaten. Multiple Leiocassis siamensis can be kept together in groups if the tank is sufficiently large with ample hiding spots. Their shy, nocturnal nature means they are best suited to calm, dimly lit aquarium catfish buy online uk environments with minimal competition and stress.

Breeding

Breeding Leiocassis siamensis in home aquariums is not commonly reported. Like many bagrid catfish, successful spawning likely requires large, mature fish, excellent water quality, seasonal conditioning with protein-rich foods, and possibly hormone-assisted techniques or specific environmental cues such as cooler water changes or increased flow to simulate monsoon conditions. Little detailed information is available on their reproductive behavior in captivity. If breeding is attempted, provide plenty of hiding spots, caves, and a varied, high-quality diet. 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 should only be undertaken by experienced aquarists.

Why Buy from Tropical Fish Co

Tropical Fish Co is your trusted source for healthy, captive-bred barred eight barbels loach for sale and other rare tropical fish uk species. Each Leiocassis siamensis is quarantined, health-checked, and carefully acclimatized before dispatch, ensuring you receive vibrant, disease-free specimens ready to thrive in your aquarium. Our expert team provides personalized care advice, aquarium setup guidance, and ongoing support to help you succeed with these fascinating freshwater aquarium fish uk. With secure packaging, next-day delivery across the UK, and a commitment to sustainable aquarium practices, Tropical Fish Co is the best place to buy tropical fish online UK. Whether you're building a peaceful Southeast Asian biotope tank or seeking a unique nocturnal addition to your community setup, our eight barbels loach deliver both charm and intrigue.