Colombian Shark Catfish Care Guide - Tank Setup, Diet & Breeding

The Colombian Shark Catfish is a sleek, silver-bodied catfish with a dark blue-grey back, a forked tail and a distinctive tall dorsal fin. Its streamlined shape and shark-like profile give it the common name “shark catfish”, although it is a true catfish rather than a small shark. The dorsal and pectoral fins carry sharp spines, so this species should be handled with particular care.

These fish are active, powerful swimmers that usually spend much of their time in the middle and lower areas of the aquarium. They are naturally sociable and are most confident in a small group, where they often cruise together rather than remaining hidden.

In the wild, Colombian Shark Catfish are associated with turbid coastal waters, tidal channels and river mouths. Young fish may travel well into freshwater, while older individuals commonly move toward brackish or marine conditions. Their ability to tolerate changing salinity has sometimes led to them being sold as freshwater community fish, but adults are better regarded as brackish-water or marine animals.

Despite their peaceful appearance, they grow far too large for many standard community aquariums. Their eventual size, activity level and need for mineral-rich water make them a specialist choice for experienced fishkeepers with a suitably large system.

Colombian Shark Catfish are native to the eastern Pacific coast of Central and South America, occurring from the Gulf of California through Mexico and Central America to Colombia, Ecuador and northern Peru. They inhabit coastal rivers, estuaries, lagoons and nearshore marine environments, moving between fresh, brackish and salt water during their lives.

A group of three requires at least 300 litres, with a larger aquarium strongly preferred as the fish mature; a footprint of around 120 x 45 cm is a practical minimum for young adults, while substantially longer tanks are better for full-grown fish. Use powerful biological and mechanical filtration, vigorous aeration and a secure cover, since these catfish are active jumpers and produce considerable waste. Provide open swimming space alongside smooth sand or fine rounded gravel, driftwood, rocks and robust brackish-tolerant plants or artificial vegetation. Salinity should be increased gradually as the fish mature, and adults are commonly maintained in stable brackish water or full marine conditions rather than kept permanently in freshwater.

Up to about 35 cm (14 in) in total length; females may become slightly larger and deeper-bodied than males.

This omnivorous catfish accepts sinking pellets and wafers formulated for carnivorous or omnivorous bottom feeders, supplemented with prawns, mussel, earthworms, chopped fish and other meaty marine foods. Offer a varied diet rather than relying on feeder fish, and include occasional vegetable ingredients or algae-based foods. Juveniles can be fed small portions once or twice daily, while adults generally do well with appropriately sized meals several times a week, removing leftovers promptly.

Colombian Shark Catfish can be kept with other peaceful, robust brackish or marine fish of a similar size, including monos, scats, larger mollies, archerfish and suitable gobies. Tankmates must tolerate the same salinity, strong filtration and active swimming conditions. Avoid very small fish, delicate species, slow-moving fish and fin-nippers, as they may be stressed or swallowed as the catfish mature. They can be kept with their own kind and should not be mixed with aggressive fish that may injure their sensitive barbels or fins.

Colombian Shark Catfish are paternal mouthbrooders: after spawning, the male collects and incubates the eggs in his mouth until they hatch. Successful breeding is uncommon in home aquariums because mature fish become large, require substantial swimming space and may need seasonal changes in salinity and water conditions that imitate their estuarine migration. A spacious brackish or marine system, excellent water quality and a compatible adult group are prerequisites, but captive spawning should not be considered routine.

Sexual differences are subtle. Mature females are often a little larger, broader and more rounded through the abdomen, while males tend to remain slightly slimmer, but reliable sexing from appearance alone is difficult.