Ripsaw Catfish Care Guide - Size, Tank Setup & Breeding

The Ripsaw Catfish is a powerful, heavily built doradid with a long, tapering body and rows of bony plates along its flanks. Its dark grey to nearly black coloration provides camouflage over shadowed riverbeds, while the pale underside is typical of a bottom-dwelling fish. The species takes its common name from the sharp, saw-like spines formed by the scutes along the sides of the body.

This catfish has a broad, flattened head, small eyes and several pairs of barbels that help it locate food in dark or turbid water. Its large pectoral and dorsal spines can lock into an erect position, making the fish difficult and potentially hazardous to handle. These spines, together with its armour, offer valuable protection from predators.

Ripsaw Catfish are generally peaceful but imposing fish. They spend much of their time near the bottom, resting among cover or moving steadily across the substrate in search of food. They may be most active during the evening and at night, although captive individuals often adjust their activity to the aquarium routine.

In the wild, this species occupies large, warm waterways with soft bottoms, submerged wood and changing currents. It is an adaptable scavenger and omnivore rather than a specialist predator, but its eventual size makes it a species for very large, carefully planned aquariums rather than ordinary community tanks.

Ripsaw Catfish are native to tropical South America, particularly the Amazon and Orinoco drainage systems. They occur in countries including Brazil, Peru, Colombia, Bolivia and Venezuela, inhabiting large rivers, tributaries and seasonally flooded areas.

Because adults become exceptionally large, a practical minimum is around 1,000 litres for one young adult, with substantially more space required as it matures; a tank or indoor pool at least 240 cm long and 90 cm wide is a useful starting guideline, though larger dimensions are preferable. Use strong filtration and vigorous oxygenation, while leaving broad open areas for swimming and turning. A soft sand substrate is safest for the barbels and underside, complemented by large, securely placed pieces of driftwood and robust shelters. All decor must be stable, as this powerful fish can shift or dislodge lightweight objects.

Up to about 100 cm (39 in) in total length in the wild, although many aquarium specimens remain smaller. Females may become deeper-bodied and heavier than males, but reliable sex-based differences in maximum length are not well documented.

Ripsaw Catfish are omnivorous opportunistic feeders. Offer a varied diet of high-quality sinking carnivore or omnivore pellets, tablets, prawns, mussel, earthworms and other meaty foods, supplemented with vegetables such as courgette, cucumber or shelled peas. Feed appropriate portions rather than allowing excess food to decay, and ensure that tankmates do not outcompete this largely nocturnal feeder.

Ripsaw Catfish can live with other large, peaceful South American species such as mature silver dollars, large characins, peaceful oscars, robust geophagus and similarly sized large catfish, provided the aquarium is spacious enough for all of them. Avoid tiny fish that could be swallowed, fin-nipping species and aggressive tankmates that may injure the catfish or compete strongly for food. Smaller or delicate bottom dwellers may also be unsettled by its size and constant foraging.

Ripsaw Catfish are not commonly bred in home aquariums. In nature, spawning is associated with seasonal rises in water level, when adults move into flooded habitats. Successful reproduction appears to depend on very large ponds or specialist public-aquarium systems, environmental triggers and substantial adult fish, so routine aquarium breeding should not be expected.

Visible sexual differences are subtle. Mature females are often broader through the abdomen and deeper-bodied, particularly when carrying eggs, while males tend to have a slimmer profile; colour and armour pattern are not dependable ways to sex this species.