Weather Loach (Dojo Loach) Care Guide: The Barometric Bottom Dweller

Few aquarium fish have as much personality as the weather loach, a gentle bottom dweller famous for its frantic swimming before storms. This weather loach dojo loach care guide from Gensou Aquascaping Singapore explains how to keep Misgurnus anguillicaudatus comfortable in our tropical climate—including the temperature challenges you need to plan for. With their eel-like bodies and endearing habit of resting in your hand, dojo loaches quickly become favourite pets.

Species Overview

The weather loach, also known as the dojo loach or pond loach, is native to East Asia’s temperate streams and rice paddies. Adults reach 15–25 cm, with a slender, cylindrical body and small barbels around the mouth. They come in wild-type brown, golden and albino forms. Their common name refers to their sensitivity to barometric pressure changes—before thunderstorms, they swim erratically, a behaviour Singapore’s frequent afternoon downpours trigger regularly.

Tank and Tub Setup

A group of three to four weather loaches needs at least 150 litres, with a soft sand substrate for burrowing. These fish love to dig, so avoid sharp gravel that could damage their barbels. Provide PVC pipes, smooth rocks and driftwood as hiding spots. In Singapore, some hobbyists keep dojo loaches in outdoor tubs on HDB balconies, which works provided you manage temperature carefully during the hottest months.

Temperature Considerations in Singapore

Here lies the main challenge. Weather loaches are temperate fish that prefer 15–25 °C, while Singapore’s ambient temperature sits at 28–32 °C. They can tolerate tropical warmth short-term but thrive best below 28 °C. Options include keeping them in an air-conditioned room, using aquarium fans or chillers, or accepting that they may be slightly less active in our heat. Many Singapore keepers report healthy dojo loaches at 27–28 °C with good oxygenation and clean water.

Water Parameters

Weather loaches tolerate a wide range of conditions: pH 6.5–8.0, GH 2–12, and they can even gulp atmospheric air when dissolved oxygen is low. Singapore’s soft, slightly acidic PUB tap water suits them well after dechloramination. Maintain ammonia and nitrite at zero. Their hardiness is legendary—they survive in muddy puddles in the wild—but that is no excuse for neglecting water quality in captivity.

Feeding

Dojo loaches are omnivorous scavengers. Sinking pellets, frozen bloodworms, Tubifex and blanched vegetables form the core diet. They actively forage along the substrate at dusk and dawn, using their barbels to detect food buried in the sand. Feed once or twice daily, ensuring food reaches the bottom before mid-water tankmates intercept it. Their appetite helps keep the tank floor clean of organic debris.

Behaviour and Compatibility

Weather loaches are sociable and should be kept in groups of at least three. They coexist peacefully with goldfish, White Cloud Mountain minnows, corydoras and other non-aggressive species. Their playful antics—standing vertically, “dancing” before rain, and occasionally floating motionless at the surface (a normal resting behaviour that alarms new owners)—make them endlessly entertaining.

Health Issues

Skin infections and Ichthyophthirius (white spot) are the most common ailments, often triggered by temperature fluctuations or poor water quality. Weather loaches are sensitive to many medications, particularly copper-based treatments. Use half-dose protocols and always remove carbon from the filter during treatment. Salt baths (2–3 g/L) are a safe first-response option.

Related Reading

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Best Pond Fish for Singapore’s Tropical Climate

How to Keep Pond Water Cool in Singapore