Blue sheatfish - Kryptopterus cryptopterus

Scientific name: Kryptopterus cryptopterus

Common name: Blue sheatfish

Family: Siluridae

Usual size in fish tanks: 19 - 21 cm (7.48 - 8.27 inch)

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Recommended pH range for the species: 6.3 - 6.9

Recommended water hardness (dGH): 8 - 16°N (142.86 - 285.71ppm)

0°C 32°F30°C 86°F

Recommended temperature: 22 - 26 °C (71.6 - 78.8°F)

The way how these fish reproduce: Spawning

Where the species comes from: East Asia

Temperament to its own species: peaceful

Temperament toward other fish species: peaceful

Usual place in the tank: Middle levels

Overview

The Blue Sheatfish (Kryptopterus cryptopterus) is a peaceful and elegant freshwater fish native to Southeast Asia. Its transparent body and graceful swimming make it a unique addition to well-maintained aquariums. These fish thrive in small groups and require stable water conditions.

Origin and Natural Habitat

Blue Sheatfish are native to Borneo and Indonesia. They inhabit slow-moving rivers, streams, and floodplains with soft substrates and ample vegetation. Their natural environment consists of well-oxygenated water with low to moderate currents.

Appearance and Size

This species grows to an adult size of approximately 19 - 21 cm (7.48 - 8.27 inches). Their elongated, transparent bodies make them one of the more visually striking fish in the hobby.

Tank Requirements

Tank Size: A minimum of 150 liters (40 gallons) is recommended for a small group.
Water Parameters:

pH: 6.3 - 6.9
Water Hardness: 8 - 16°N (142 - 285 ppm)
Temperature: 22 - 26°C (71.6 - 78.8°F)

Tank Setup: A well-planted aquarium with open swimming spaces is ideal. Adding driftwood and floating plants can help them feel secure.

Temperament and Tank Mates

Blue Sheatfish are peaceful schooling fish and should be kept in groups of at least 3 individuals. Suitable tank mates include:

Tetras
Gouramis
Rasboras
Loaches

Avoid housing them with aggressive or overly boisterous species.

Feeding and Diet

Blue Sheatfish are omnivorous but require a protein-rich diet:

High-quality flake or pellet food as a staple
Live or frozen foods such as bloodworms, brine shrimp, and mysis shrimp

Providing a varied diet ensures their health and vibrant appearance.

Sexing

Males are generally slimmer than females and have a serrated edge on their pectoral fins, which is absent in females.

Breeding

There are no recorded cases of successful breeding in home aquariums.

Lifespan

With proper care, Blue Sheatfish can live between 5 to 8 years.

Conclusion

The Blue Sheatfish (Kryptopterus cryptopterus) is a graceful and peaceful species best suited for well-maintained aquariums. Their transparent bodies, peaceful nature, and schooling behavior make them an intriguing addition to any tank with compatible fish.