Fish
Bristlenose Pleco
Ancistrus cirrhosus · also called bristlenose catfish
Resting motionless against a piece of driftwood by day, a bristlenose pleco emerges at night to graze algae with its sucker-like mouth, a far more manageable size than its giant pleco relatives, and in mature males, sporting a face full of branching fleshy tentacles.
Overview
The bristlenose pleco, Ancistrus cirrhosus, is native to slow-moving rivers and wetlands across parts of South America. Its practical smaller size, distinctive male facial tentacles, and cave-spawning breeding behaviour make it one of the most popular and manageable algae-eating catfish kept in home aquariums.
A pleco that doesn’t outgrow its tank
Unlike the common pleco, which can reach 30 centimetres or more and surprise unprepared owners, the bristlenose pleco tops out at a far more modest size, making it a genuinely practical choice for algae control in an ordinary home aquarium.
Status
Not Evaluated for conservation status, widespread across suitable South American freshwater habitat.
Bristlenose Pleco: common questions
How is the bristlenose pleco different from other plecos?
It stays far smaller, typically only 10 to 15 centimetres, compared to the 30 centimetres or more reached by larger common pleco species, making it a much more practical algae-eater for a typical home aquarium.
Why do male bristlenose plecos have tentacles on their face?
Mature males grow branching, fleshy tentacles around the mouth, a trait linked to sexual maturity and mate selection, while females lack them or show only a much smaller version.
How does the bristlenose pleco breed?
It is a cave-spawning fish, laying eggs inside a cave or sheltered crevice, after which the male guards and fans the eggs with his fins until they hatch, taking on the primary parenting role.
What does the bristlenose pleco eat?
It is an omnivore, grazing algae off surfaces and also eating vegetables and sinking prepared foods, making it a useful algae-control fish in aquariums.