Description
Overview:
The Asian Upside-Down Catfish (Mystus leucophasis) is a fascinating and unique species named for its habit of swimming belly-up, especially when feeding at the water’s surface or resting under driftwood. With its sleek, torpedo-shaped body, long barbels, and shimmering silver-to-dark coloration, this nocturnal oddball brings both character and movement to medium-to-large freshwater tanks.
Origin:
Native to Southeast Asia, particularly the Irrawaddy River basin in Myanmar, Mystus leucophasis inhabits slow-moving rivers, swamps, and flooded forests where it hunts at dusk and dawn.
Feeding:
An opportunistic omnivore, this catfish accepts a wide variety of foods including sinking pellets, bloodworms, brine shrimp, insect larvae, and frozen meaty foods. Will also feed near the surface—often upside down—making it a joy to watch during mealtimes.
Tank Mates:
Peaceful to semi-aggressive depending on size and environment. Best kept with similar-sized or larger peaceful fishsuch as gouramis, rainbowfish, larger barbs, loaches, or calm cichlids. Avoid small fish or shrimp, which may be mistaken for food.
Water Parameters:
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Temperature: 75–82°F (24–28°C)
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pH: 6.5–7.5
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Moderate hardness
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Minimum Tank Size: 55 gallons
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Provide plenty of driftwood, hiding spots, and dim lighting
Behavior & Compatibility:
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Nocturnal but may become more active in dim tanks
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Best kept in groups of 3 or more for natural schooling behavior
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Prefers low to moderate flow, subdued lighting, and soft substrate
Special Notes:
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Can grow up to 8–10 inches, so needs ample swimming space
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Extremely hardy once established
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Will thrive in planted or natural setups with cover and structure
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Captivating for aquarists who enjoy unusual behaviors and oddball species
The Asian Upside-Down Catfish is a mysterious, elegant, and intelligent species that adds motion and intrigue to any large freshwater aquarium. Its unique swimming style and peaceful temperament make it a standout choice for aquarists looking for something different.







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