Dwarf Pike Characin

Acestrorhynchus minimus is the smallest species in its genus, reaching only about 15 cm, making it one of the more practical predatory characins for intermediate hobbyists who lack the space for the full-sized species. Despite its smaller stature it retains all the predatory behaviours and physical characteristics of its larger relatives: a long pointed snout, sharp teeth, large eyes, and the characteristic black spot at the base of the caudal fin. It is native to the Amazon basin.

In the aquarium A. minimus requires at least 200 litres with soft, slightly acidic water, good oxygenation, and efficient filtration. It is a fast swimmer that should be provided with open water space and a tight lid. While it can be kept in small groups of its own species in sufficiently large aquariums, it will readily prey on any small tetra or similarly-sized fish — tankmates must be chosen carefully.

Feeding includes live or frozen small fish, frozen bloodworm, and small shrimp, with eventual weaning to carnivore pellets. Its more manageable size compared to other pike characins makes it one of the more achievable specialist predatory fish for intermediate aquarists. It is a lively, engaging fish with an impressive hunting display.

Water: Soft to moderately hard, pH 5.5–7.5, 24–28°C; good oxygenation; regular water changes. Tank: 200 L minimum; open water; tight lid; no nano fish as tankmates. Feeding: Small piscivore — frozen bloodworm, small frozen fish, shrimp; wean to carnivore pellets. Breeding: Not documented in captivity. Compatibility: Predatory toward small fish; most accessible Acestrorhynchus for intermediate hobbyists.