Mystus wolffii

Scientific name: Mystus wolffii

Common name: N/A

Family: Bagridae

Usual size in fish tanks: 18 - 22 cm (7.09 - 8.66 inch)

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Recommended pH range for the species: 6.4 - 7.8

Recommended water hardness (dGH): 8 - 20°N (142.86 - 357.14ppm)

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: South Asia

Temperament to its own species: peaceful

Temperament toward other fish species: peaceful

Usual place in the tank: Bottom levels

Food and feeding

Mystus wolffii is a carnivorous bottom-dweller that primarily feeds on insects, crustaceans, and small aquatic organisms in the wild. In the aquarium, they readily accept live and frozen foods such as bloodworms, brine shrimp, and chopped earthworms. They can also be conditioned to eat high-quality sinking pellets designed for carnivorous catfish. Feeding should take place in the evening or after lights are dimmed, as this species is more active during twilight hours.

Origin

This species is native to Southeast Asia, ranging from Thailand to Indonesia. It inhabits slow-moving rivers, streams, and floodplains with soft substrates and dense vegetation or submerged roots.

Sexing

Males can be identified by the presence of a small, elongated genital papilla located in front of the anal fin. Females are generally more robust in body shape, especially when carrying eggs.

Breeding

There are currently no confirmed reports of Mystus wolffii breeding in captivity. In the wild, they are believed to be seasonal spawners that reproduce during the rainy season, likely scattering eggs among submerged roots or vegetation. Breeding in an aquarium would require simulation of environmental triggers, such as seasonal temperature and water chemistry changes, but success remains undocumented.

Lifespan

With proper care, Mystus wolffii can live up to 30 years, making it one of the longest-living freshwater catfish species commonly kept in aquariums.

Short description

Mystus wolffii is a peaceful, nocturnal catfish species that prefers the lower regions of the aquarium. Growing up to 22 cm (8.7 inches), it requires a spacious tank with a soft sandy substrate and plenty of hiding places such as driftwood, caves, and dense planting. This shoaling species is best kept in small groups of 4–6 to reduce stress and encourage natural behavior. They are ideal for larger, peaceful community aquariums.

Suitable tankmates

Given its calm temperament, Mystus wolffii can coexist with a variety of peaceful, similarly sized species. Avoid small fish that could be mistaken for food. Recommended tankmates include:

Tinfoil barbs
Bala sharks
Clown loaches
Large rainbowfish
Severum cichlids
Other large, peaceful bottom-dwelling species

Recommended plants

Although Mystus wolffii is not known to uproot plants, it prefers dimly lit aquariums with shaded areas. Use hardy or low-light plant species and floaters to create a natural, river-like environment. Suitable plants include: