What Asian Stone Catfish Are and How They Behave

The Asian stone catfish (Hara jerdoni) is a small, armored catfish native to fast-moving streams in India and Southeast Asia. Adults reach only 1 to 1.5 inches long, making them one of the smallest catfish species in the aquarium trade. They are nocturnal bottom-dwellers that spend most of the day hidden under rocks, driftwood, or in caves, becoming more active at night when they forage for food along the substrate.

These fish are named for their habit of resting motionless on rocks and wood, where their mottled brown and gray coloring provides camouflage. Unlike many catfish, they are not aggressive toward other fish, but they are also not social with their own kind—keeping them in groups requires careful planning and adequate space. They produce audible squeaking or squealing sounds, especially when stressed or handled, which can startle new keepers.

Asian stone catfish are hardy and long-lived for their size, often surviving 8 to 10 years in well-maintained tanks. They are best suited to experienced aquarists who understand their specific water requirements and feeding habits, rather than beginners looking for an easy starter fish.

Key Takeaways

  • Asian stone catfish require cool water between 60 and 72°F, which rules out most tropical community tanks and often requires a chiller or unheated room.
  • They are strictly nocturnal and spend daylight hours hidden, so expect to see them only at night or during feeding time in low light.
  • A 20-gallon long tank is the minimum for a single fish, with additional space needed if you keep more than one, and they must have multiple hiding spots made of rock, wood, or ceramic caves.
  • They eat small live or frozen foods such as bloodworms, daphnia, and small shrimp, and will not reliably eat standard sinking pellets or flakes.
  • Keeping them in groups is possible but requires careful observation, as they may compete for hiding spots and can injure each other during territorial disputes.

Tank Size and Setup Requirements

A single Asian stone catfish needs a minimum of 20 gallons, though a 20-gallon long (30 inches × 12 inches × 12 inches) is preferable to a tall tank because it provides more floor space where these bottom-dwellers spend their time. If you plan to keep more than one, add 10 gallons per additional fish and ensure you have enough hiding spots that each fish can claim its own territory without constant conflict.

The substrate should be smooth sand or fine gravel—never sharp or coarse material, as their soft undersides are easily damaged. Provide abundant hiding places using slate, smooth river rocks, pieces of driftwood, and ceramic or PVC caves. These fish need to feel secure during the day, and inadequate hiding spots cause stress and increased aggression toward tank mates. Arrange the décor so that hiding spots are spread throughout the tank rather than clustered in one corner, which reduces territorial disputes.

Water flow should be moderate to strong, mimicking the fast streams where these fish live naturally. A powerhead or strong filter output helps, but avoid creating a current so powerful that the fish cannot rest. The tank should be dimly lit or have a low-light period; bright lighting stresses them and keeps them hidden even at night. Many keepers use a timer to provide 8 to 10 hours of light and 14 to 16 hours of darkness.

Water Temperature and Chemistry

This is the most demanding aspect of keeping Asian stone catfish. They require cool water between 60 and 72°F, with 65 to 70°F being ideal. This temperature range is significantly cooler than standard tropical tanks, which typically run 76 to 80°F. In warm climates or heated homes, maintaining these temperatures often requires a chiller, which adds cost and complexity to the setup.

Water pH should be neutral to slightly acidic, between 6.5 and 7.5. They tolerate a range of hardness but prefer soft to moderately hard water. Perform 25 to 30 percent water changes weekly to maintain water quality and keep nitrates low. These fish are sensitive to poor water conditions, and ammonia or nitrite spikes can cause rapid decline or death.

Because they require cool water, Asian stone catfish cannot be housed with most tropical community fish. Goldfish, some danios, and certain loaches tolerate similar temperatures, but compatible tank mates are limited. Many keepers maintain a species-only setup or keep them with only a few carefully chosen cool-water fish.

Feeding and Diet

Asian stone catfish are carnivorous and will not reliably eat standard aquarium foods like flakes or pellets. They require small live or frozen foods, with bloodworms and daphnia being the most readily accepted options. Frozen foods work well and are safer than live cultures, which can introduce parasites or disease. Offer food in the evening or at night when the fish are active, using a feeding dish or scattering small amounts on the substrate.

Feed once daily or every other day, providing only what the fish will consume in a few minutes. Overfeeding fouls the water quickly in a small tank and leads to health problems. Young fish and those in breeding condition may need more frequent feeding. Some individuals will eventually accept small sinking pellets if trained from a young age, but do not assume this will happen—always have live or frozen foods on hand.

Variety in diet improves health and coloration. Rotate between bloodworms, daphnia, small brine shrimp, and finely chopped earthworms. Avoid large foods that the fish cannot fit in their mouths, as they may choke or waste food by spitting it out.

Behavior, Compatibility, and Social Structure

Asian stone catfish are solitary by nature and do not school or shoal. A single fish in a properly set up tank is content and shows normal behavior. Keeping them in pairs or small groups is possible but requires careful observation and adequate space. Conflicts typically arise over hiding spots, and subordinate fish may be chased or nipped, leading to stress, injury, or death.

If you keep multiple fish, provide at least three hiding spots per fish so that each individual can retreat without being cornered. Watch for signs of stress such as torn fins, reluctance to emerge at night, or one fish being excluded from all hiding places. If aggression escalates, separate the fish immediately.

As tank mates, Asian stone catfish are generally peaceful toward other species, but their small size makes them vulnerable to predation by larger fish. They should not be kept with cichlids, large tetras, or any fish large enough to swallow them. Cool-water species like certain danios, loaches, and small goldfish are safer choices, though even these require careful observation during the acclimation period.

Common Health Issues and Stress Indicators

Stress is the primary cause of illness in captive Asian stone catfish. Signs include refusing food, remaining hidden even at night, torn or clamped fins, and excessive squeaking when disturbed. Stress typically results from water temperature outside the ideal range, inadequate hiding spots, poor water quality, or incompatible tank mates.

Ich (white spot disease) and other parasites can occur if water quality declines or if live food is contaminated. Treat ich with temperature adjustment if possible—raising the temperature slightly speeds up the parasite's life cycle—combined with frequent water changes. Avoid copper-based treatments, as these catfish are sensitive to copper and other medications.

Fin rot and bacterial infections develop when water quality is poor or when fish are injured during territorial disputes. Maintain pristine water conditions and address aggression immediately to prevent secondary infections. If a fish stops eating or shows visible sores, perform large water changes and consider isolating it in a hospital tank.

Sourcing and Long-Term Commitment

Asian stone catfish are available from specialty aquarium retailers and online suppliers, though they are less common than other catfish species. Prices vary but typically range from $8 to $15 per fish. Because they have specific requirements, buy only from sellers who can confirm the fish are healthy and have been acclimated to captive conditions.

Before purchasing, ensure you have the tank already set up and running at the correct temperature for at least two weeks. These fish are sensitive to transport stress and sudden changes in water conditions, so a mature, stable tank is essential for their survival. Do not buy on impulse or assume you can adjust conditions after bringing them home.

This species is a long-term commitment. With proper care, they live 8 to 10 years, so be prepared for a decade of maintaining cool water, providing appropriate food, and monitoring their behavior. They are rewarding fish for patient keepers who enjoy observing nocturnal behavior and appreciate the challenge of meeting specialized care requirements.

Frequently Asked Questions

Can I keep Asian stone catfish in a heated tropical tank?

No. Temperatures above 72°F cause stress and shorten their lifespan significantly. If your home or room stays warm, you will need a chiller to maintain the 60 to 72°F range they require. Without one, this species is not suitable for your setup.

Do Asian stone catfish need to be kept in groups?

No. A single fish is perfectly content and often less stressed than one in a group. Keeping multiples requires extra space, multiple hiding spots, and close observation for aggression. Start with one fish unless you have a large tank and experience managing territorial behavior.

Why is my Asian stone catfish making squeaking sounds?

These fish produce squeaks and squeals when stressed, handled, or during feeding. It is normal behavior, not a sign of illness. However, constant squeaking during the day suggests the fish is stressed—check water temperature, hiding spots, and tank mates for problems.

What should I do if my fish stops eating?

First, check water temperature and quality. Poor conditions are the most common cause of appetite loss. If temperature and chemistry are correct, try offering different foods—some individuals prefer certain types of frozen food over others. If the fish refuses food for more than a few days, isolate it in a hospital tank and monitor for signs of disease.

Can Asian stone catfish live with shrimp or other small invertebrates?

No. These catfish eat small invertebrates as part of their natural diet, so they will hunt and consume shrimp, small snails, and other crustaceans. Keep them only with fish or in a species-only setup.