Gomes's Round Stingray

Heliotrygon gomesi was described only in 2011 and remains one of the least-known freshwater stingrays in captivity. It inhabits lowland Amazonian rivers and is remarkable for its extreme disc roundness, very short non-whip tail, and absence of a large venomous spine — it possesses only a vestigial spine unlike most rays. The disc is uniformly pale brown to cream, lacking the bold patterns of Potamotrygon. In the aquarium it requires identical water quality standards to other potamotrygonids and a wide, shallow tank. Its pale colouration is best appreciated over dark sand. Its docility and reduced spine make it slightly less hazardous to handle than standard stingrays, though all contact should still be avoided. It is extremely rare in captivity and a significant find for any advanced ray keeper.

Water: 24–28°C, pH 5.5–7.0, soft (1–8 dGH); zero ammonia/nitrite; large regular water changes essential. Tank: Minimum 900L, very wide and shallow preferred, fine dark sand enhances the pale disc; minimal hard decor. Feeding: Carnivore; earthworms, frozen bloodworm, prawn, diced mussel; prefers small frequent meals. Breeding: No captive breeding records; extreme rarity of specimens makes this a distant goal. Compatibility: Peaceful with large sedate fish; its docile nature means it may be outcompeted for food by more active species.