Hoplo Catfish Care Guide - Setup, Feeding & Breeding

Hoplo Catfish are robust, whiskered bottom-dwellers with an elongated body protected by rows of bony plates. Their brown to olive-brown coloration is broken by darker markings, providing effective camouflage among leaf litter, roots and muddy or sandy riverbeds. Two pairs of barbels around the mouth help them search for food in poor visibility.

Despite their armoured appearance, Hoplo Catfish are generally peaceful and active fish. They often explore the bottom during the daytime, although they become especially lively at dusk and after the aquarium lights go out. Individuals may rest beneath wood or plants, then suddenly dash around the tank when feeding.

In nature, this species is associated with quiet, shallow waters that may become warm, oxygen-poor and heavily vegetated during the wet season. Hoplo Catfish have the ability to gulp atmospheric air, allowing them to survive in habitats where dissolved oxygen levels fluctuate. They can also make audible clicking or grunting sounds when stressed or handled.

Megalechis thoracata was formerly widely known in the aquarium trade as Hoplosternum thoracatum. Its peaceful temperament, hardiness and distinctive appearance have made it a long-standing favourite among keepers of larger community aquariums, though its adult size and energetic nature should not be underestimated.

Hoplo Catfish are native to northern and central South America, occurring in countries including Venezuela, Colombia, Brazil, Bolivia, Peru, French Guiana and surrounding regions. They inhabit slow-moving rivers, floodplains, marshes and seasonally flooded forest waters.

A group or adult community setup should have at least 200 litres, with a footprint of about 120 by 45 cm or larger; a single specimen still benefits from a similarly spacious aquarium because of its adult size and active foraging habits. Use fine sand or smooth rounded gravel that will not damage the barbels, along with driftwood, robust plants, caves and other shaded retreats. Leave open areas for bottom exploration, secure the lid because these catfish can jump, and provide efficient filtration with gentle to moderate circulation and good surface oxygen exchange.

Up to 18 cm (7 in) in total length. Females are usually somewhat larger and deeper-bodied than males, while males are often slightly slimmer.

Hoplo Catfish are opportunistic omnivores that search through the substrate for insect larvae, worms, crustaceans, plant matter and other organic debris. Offer a varied diet of sinking catfish pellets or wafers supplemented with frozen or live foods such as bloodworms, brine shrimp, daphnia and chopped earthworms. Occasional softened vegetables can add variety, but meaty foods should form an important part of the diet for growing and breeding fish. Feed after lights-out or ensure food reaches the bottom before faster midwater fish consume it.

Hoplo Catfish can live with peaceful South American community fish such as medium-sized tetras, larger rasboras, peaceful barbs, angelfish, gouramis and other calm cichlids. They also generally mix well with peaceful plecos and other non-aggressive bottom-dwellers when enough space and hiding places are available. Avoid highly aggressive cichlids, fin-nipping species and very small fish or shrimp that may be swallowed while the catfish forage. Their tankmates should also tolerate a similarly warm, neutral to mildly acidic environment.

Hoplo Catfish are bubble-nest breeders. A mature male builds a floating nest beneath broad leaves or a piece of floating cover, then courts the female and fertilises the eggs as they are deposited. The male collects and guards the eggs, often defending the nest vigorously. For breeding, provide a spacious, well-filtered aquarium with floating plants or a floating support, condition the adults with plenty of meaty foods, and remove the female after spawning if necessary. The fry hatch after roughly three days and can be raised on very small live foods or a suitable powdered fry food once they become free-swimming.

Mature females are generally larger, rounder and less vividly marked than males. Breeding males develop thickened, elongated pectoral spines with a reddish to orange colouration and may become darker, sometimes appearing almost black around the breeding season; females retain shorter, paler pectoral spines.