Small-scaled Pike Characin

Acestrorhynchus microlepis takes its species name from its distinctly fine, small scales that create a smooth, almost polished appearance unlike the more roughly textured flanks of related species. It is a medium-sized predatory characin reaching about 22 cm, found across the Amazon and Orinoco river systems, and is one of the more widely distributed and frequently encountered Acestrorhynchus species in the wild. It has the genus's characteristic pointed snout and prominent dark caudal spot.

In the aquarium, A. microlepis requires at least 400 litres with soft to moderately hard water, good oxygenation, and strong filtration. It is a fast, agile hunter that in the wild targets schooling tetras and small characins. It should not be housed with any fish small enough to be consumed and is best kept solo or with large, robust, non-aggressive species.

Feeding includes live or frozen small fish and invertebrates, with weaning possible toward frozen preparations and eventually carnivore pellets. It is more accessible than the very largest Acestrorhynchus species and is a feasible choice for intermediate-to-advanced aquarists interested in predatory characins. Its fine-scaled elegance and sleek build make it a visually distinctive addition to specialist displays.

Water: Soft to moderately hard, pH 5.5–7.5, 24–28°C; good oxygenation and regular water changes. Tank: 400 L minimum; open water; tight lid; no small tankmates. Feeding: Piscivore — small live/frozen fish, frozen bloodworm; wean to carnivore pellets. Breeding: Not documented. Compatibility: Predatory; best solo or with large non-swallowable species.