Wallace's Payara

Hydrolycus wallacei is named for Alfred Russel Wallace, the great nineteenth-century naturalist who catalogued much of the Amazon fauna. It is the smallest of the three commonly recognised Hydrolycus species, reaching around 60 cm — still a very large fish, but modestly more feasible for specialist hobbyists than H. scomberoides or H. armatus. It retains the characteristic sabre-like lower jaw fangs and the powerful, torpedo-shaped silver body of its relatives.

Care requirements follow the same principles as other Hydrolycus species: very large, heavily oxygenated aquariums with strong flow, excellent water quality, and a piscivorous diet. Its slightly smaller size means a 2000-litre aquarium is a reasonable minimum rather than the 4000–5000 litres required for the larger species. It is still, however, strictly a specialist fish and no standard home aquarium setup will accommodate it.

Hydrolycus wallacei is occasionally available from specialist importers and is highly prized by large-fish collectors for its iconic fanged profile at a somewhat more manageable scale. Like all Hydrolycus it should be maintained as a solo specimen, fed a diet of fresh fish, and provided with the cleanest possible water conditions.

Water: Soft, pH 5.5–7.5, 24–28°C; high oxygenation and strong flow; pristine conditions. Tank: 2000 L minimum; open water lanes; secure lid; powerful filtration. Feeding: Carnivore — fresh fish, feeder fish initially, transition to prepared meaty foods. Breeding: Not documented. Compatibility: Solo specimen; apex piscivore.