Bristlenose catfish - Ancistrus cirrhosus

Scientific name: Ancistrus cirrhosus

Common name: Bristlenose catfish

Family: Loricariidae

Usual size in fish tanks: 11 - 15 cm (4.33 - 5.91 inch)

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Recommended pH range for the species: 5.8 - 7.6

Recommended water hardness (dGH): 4 - 18°N (71.43 - 321.43ppm)

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 America

Temperament to its own species: peaceful

Temperament toward other fish species: peaceful

Usual place in the tank: Bottom levels

Tank Requirements

The Bristlenose Catfish (Ancistrus cirrhosus) is a popular choice for aquarists due to its peaceful nature and manageable size. Unlike the common and sailfin plecos, Bristlenose plecos stay relatively small, growing to about 11-15 cm (4.33-5.91 inches), which makes them ideal for standard home aquariums. While a minimum tank size of 20 gallons (75 liters) is suitable, larger tanks are always better for providing ample swimming space. Always ensure the tank is properly cycled before introducing the fish. They thrive in aquariums with good filtration and moderate water flow to replicate their natural environment, and adding an air stone for extra oxygenation can help maintain ideal conditions.

Bristlenose catfish are nocturnal, so provide them with plenty of hiding spots, such as caves, rocks, or driftwood. They will appreciate dark areas where they can rest during the day. The substrate should be soft gravel or sand to prevent damage to their sensitive barbels, as they spend a significant amount of time foraging along the bottom.

Tankmates

Bristlenose plecos are peaceful fish that can coexist with a variety of tankmates. They do best with other peaceful fish that prefer similar water conditions. Suitable companions include Corydoras catfish, peaceful cichlids like dwarf cichlids, and schooling fish such as Black Neon Tetras or Rummy Nose Tetras. Due to their docile temperament, avoid keeping them with aggressive species or large, predatory fish that may see them as prey.

Feeding

Though often sold as "algae eaters," Bristlenose catfish cannot survive on algae alone. In the wild, their diet consists of plant matter, small invertebrates, and organic debris. In the aquarium, you can offer a variety of foods to keep them healthy. Sinking algae or spirulina pellets should form the basis of their diet. Supplement this with blanched vegetables such as zucchini or cucumber, and offer protein-rich foods like bloodworms or mosquito larvae a couple of times a week.

Sexing

Sexing Bristlenose plecos is relatively easy once they reach maturity. Males are typically larger and develop more pronounced bristles around their heads. Females may also have bristles, but these are much smaller and less defined.

Breeding

Breeding Ancistrus cirrhosus is straightforward and can be accomplished in most home aquariums. They are cave spawners, so provide a variety of caves or tubes where the male can claim a territory. When the female is ready to spawn, she will lay eggs in the male’s cave, and he will fertilize them. The male takes full responsibility for guarding and fanning the eggs until they hatch, which usually takes about 4-5 days. Once the fry emerge from the cave, they will feed on algae and small food particles that settle on the tank floor. Newly hatched brine shrimp and finely crushed flakes are also suitable for the fry.

Lifespan

Bristlenose catfish can live for 4-6 years in captivity with proper care. Older specimens may become less active and spend more time hiding. Regular water changes and a varied diet are key to ensuring their long-term health and well-being.

Short Description

Ancistrus cirrhosus, commonly known as the Bristlenose catfish, is a hardy and peaceful species that is ideal for community aquariums. Known for their algae-eating abilities, they help to keep tanks clean, although they do require additional food to stay healthy. Their small size makes them an excellent choice for mid-sized aquariums, and they thrive in environments with plenty of hiding places and stable water conditions. Bristlenose plecos are easy to breed in captivity and are a popular choice for both beginner and experienced aquarists.

Additional Resources

For a detailed guide on caring for Bristlenose catfish, check out our full guide. Watch our video on Bristlenose catfish here! (approximately 7.3 MB, MPEG format).

This page was updated on 10^th January 2016 thanks to Aquariadise.com.