Cururu Stingray Care Guide - Aquarium Setup, Diet & Breeding

The Cururu Stingray is a small freshwater stingray with a rounded, flattened disc, a long whip-like tail and a striking pattern of dark rosettes, spots or reticulated markings over a paler brown background. Its pattern varies between individuals and helps it blend into the dappled sand and leaf litter of its blackwater home.

Unlike many large river stingrays, this species remains relatively compact, making it one of the more manageable Potamotrygon species for specialist aquarists. It spends much of its time resting on the bottom, often partly covered by sand, but becomes active when searching for food.

Cururu Stingrays use electroreception and sensitive sensory organs around the mouth to locate prey hidden beneath the substrate. Their mouths are adapted for taking invertebrates and other small animals from the riverbed, while the venomous barb on the tail is a defensive structure rather than a hunting weapon.

In the wild, seasonal changes in river level connect shallow beaches, flooded forest and deeper channels. The species is closely associated with the Rio Negro’s unusual blackwater environment and is valued in the aquarium trade for its attractive pattern, modest adult size and fascinating behaviour.

The Cururu Stingray is endemic to the middle and upper Rio Negro basin in northern Brazil, South America. It inhabits the dark, acidic waters and sandy margins of the Negro system and its tributaries.

Allow at least 500 litres for one adult, with a larger aquarium preferred for a pair or community. A footprint of approximately 180 × 60 cm should be treated as a practical minimum, since floor space matters far more than height. Use a deep layer of smooth, fine sand so the ray can bury itself without abrading its underside, and leave broad open areas for movement. Rounded wood, subdued lighting and sturdy plants attached above the substrate can provide cover, although delicate rooted plants may be disturbed. Powerful, reliable filtration and strong biological capacity are essential, and all equipment must be guarded against the ray’s body and tail.

Adults reach about 30 cm (12 in) across the disc, with females generally larger and broader than males; males commonly remain closer to 25 cm (10 in) across the disc.

This carnivorous ray feeds on worms, insect larvae, crustaceans and small fish. In aquaria, offer a varied diet of earthworms, bloodworm, blackworm, prawns, mussel and suitably sized pieces of fish, with younger rays receiving appropriately small foods. Food should be fresh or frozen from a reliable source, and uneaten portions should be removed promptly because stingrays produce considerable waste.

Cururu Stingrays are best kept with peaceful, medium to large fish that occupy the upper or middle levels of the aquarium and will not nip their disc or compete aggressively for food. Suitable companions may include larger peaceful characins, peaceful knifefish and compatible South American cichlids, provided their water requirements match. Avoid fin-nipping species, highly territorial cichlids, aggressive catfish and any fish small enough to be swallowed. Tankmates must also be able to tolerate warm, soft, acidic water and should not harass the ray while it is feeding.

Cururu Stingrays are livebearers and can breed in a mature, spacious aquarium when kept in compatible pairs or groups. Courtship may involve the male following and gripping the female with his mouth before mating. After an internal gestation of roughly three to four months, the female gives birth to a small litter of fully formed pups, commonly one to four. Well-conditioned adults should be offered a varied, protein-rich diet, while the female needs calm surroundings and excellent water quality before and after giving birth.

Males possess a pair of conspicuous claspers beside the base of the tail, while females lack claspers and usually develop a broader, heavier disc. Mature females are often larger overall than males.