Dorado Catfish Care Guide - Size, Habitat & Breeding

The Dorado Catfish, Brachyplatystoma rousseauxii, is one of the largest and most powerful freshwater catfish in the world. It has a long, streamlined body, a broad flattened head and a silvery to bronze-gold coloration that gives the species its common name. Its mouth is equipped with strong teeth suited to catching other fish.

Dorado Catfish are native to major South American river systems, especially the Amazon and Orinoco basins. They are highly migratory fish associated with large freshwater rivers from the Andean headwaters to downstream floodplain regions.

Dorado Catfish are unsuitable for private home aquariums because of their immense adult size, rapid growth and need for long uninterrupted swimming space. A single adult would require a purpose-built public-aquarium exhibit of at least 10,000 litres, with substantially larger systems preferable; a practical enclosure should be several times the fish's length, such as roughly 600 cm long, 250 cm wide and 250 cm deep. The layout should provide powerful, well-oxygenated open water, smooth surfaces, secure filtration and minimal robust decor, with sand or fine rounded gravel if substrate is used.

Dorado Catfish can reach approximately 150 cm (59 in) in total length. Females are generally capable of growing larger and heavier than males, although exceptionally large specimens are uncommon.

This species is a highly predatory fish that feeds mainly on other fish, including migratory species encountered in large rivers. Juveniles and adults may also take crustaceans and other aquatic animals. Captive specimens would require a carefully managed diet based on appropriately sized whole fish and other marine or freshwater foods, rather than relying on dry aquarium foods.

Dorado Catfish are not suitable for a conventional community aquarium. They are powerful predators that will swallow smaller fish and may injure tankmates during feeding or sudden movements. Only exceptionally large, robust fish of comparable size could potentially share a professionally designed public-aquarium exhibit, and even then compatibility would need close monitoring.

Dorado Catfish are not realistically bred in home aquariums. In nature, adults undertake immense upstream migrations to reach spawning areas in the upper Amazon and Orinoco regions, while the larvae and young fish drift downstream. Successful reproduction requires natural river flows, seasonal conditions and enormous distances, so captive spawning has not become a practical aquarium-breeding project.

Females are typically larger and heavier-bodied than males, particularly when mature. External differences are otherwise subtle, and reliable sexing usually requires examination by an experienced specialist.