Orinocensis Silver Dollar

Metynnis orinocensis is restricted to the Orinoco drainage and its associated blackwater tributaries in Venezuela and Colombia. While its outward appearance closely resembles M. argenteus, it consistently benefits from softer and more acidic water than its Amazonian counterpart, reflecting its origin in the distinctly different Orinoco hydrochemistry.

Behaviourally and in terms of care, it follows the standard Metynnis template. For those constructing an Orinoco biotope aquarium alongside species such as Pygocentrus cariba, Altuvei piranha, or Orinoco cichlids, it provides an authentic schooling element.

Not subject to piranha restrictions.

Water: 24-28°C, pH 5.0-7.0, soft water preferred (1-8 dGH); blackwater tannin supplementation beneficial for this Orinoco native. Tank: Minimum 180L for a small school; taller format; driftwood and Indian almond leaves for authentic décor. Feeding: Herbivore; spirulina pellets, blanched greens, vegetables; high-quality plant-based diet. Breeding: Egg-scatterer; rarely bred in captivity. Compatibility: Peaceful; ideal for Orinoco biotope tanks; compatible with non-aggressive large South American species.