Hoplo Catfish

Hoplosternum littorale is a robust, thick-set callichthyid catfish found across a broad range of northern and central South America, including Trinidad. It is a natural inhabitant of stagnant lagoons, flooded savannahs, and oxygen-poor rivers, surviving through intestinal air-breathing in conditions fatal to most fish. Adult males develop noticeably thickened and reddened pectoral spines during breeding season.

In the aquarium, Hoplo Catfish are bold, active, and often the first residents to approach the glass at feeding time. They accept virtually any sinking food and quickly learn to feed from the owner's hand. Their broad environmental tolerance makes them forgiving for beginners, though their eventual size and active swimming require a tank of at least 180 litres.

Males construct elaborate bubble nests and can be territorial around them. They are best kept with similarly sized, robust tankmates such as large characins, robust cichlids, or other callichthyids. Their plated armoring protects them from most incidental aggression, and they are generally excellent community fish for the appropriately large setup.

Water: 20–28°C, pH 5.5–8.0; highly tolerant but water changes improve colour and activity. Tank: 180 L minimum; sand substrate; provide driftwood caves; floating plants for bubble nest attachment. Feeding: Sinking pellets, wafers, bloodworm, earthworms, and most meaty or vegetable-based sinking foods. Breeding: Males build large floating bubble nests; prolific in captivity when well conditioned; fry easy to raise. Compatibility: Peaceful with larger robust community fish; may consume very small tankmates.