description Ocellate River Stingray Overview
The ocellate river stingray (Potamotrygon motoro) is a species of freshwater cartilaginous fish native to the Amazon, Orinoco, and Paraná river basins in South America. It is characterized by a circular, flattened disc covered in distinctive orange or yellow spots ringed with black, known as ocelli, which provide camouflage against the riverbed. This species features a venomous spine on its tail used for defense and is sometimes kept by experienced aquarists in large, specialized freshwater tanks.
help Ocellate River Stingray FAQ
How big do ocellate river stingrays get in an aquarium?
Potamotrygon motoro can reach a disc width of approximately 40–50 cm (16–20 inches) in captivity, with wild specimens occasionally growing larger. Females generally grow larger than males, and both sexes require very large tanks to accommodate their active bottom-dwelling lifestyle.
What do ocellate river stingrays eat?
In the wild they are carnivorous benthic predators, consuming small fish, crustaceans, aquatic insects, and worms. In captivity, they are commonly fed blackworms, bloodworms, ghost shrimp, pieces of fish fillet, and sinking carnivore pellets.
What size tank does an ocellate river stingray need?
A single adult P. motoro typically requires a tank of at least 200 gallons with a very large footprint, as these rays spend nearly all their time on the substrate. Pristine water quality, sandy substrate, and excellent filtration are essential because they produce heavy bioloads.
Are ocellate river stingrays dangerous to handle?
Yes, like other members of the family Potamotrygonidae, P. motoro possesses one or more serrated venomous spines on the dorsal side of its tail that can inflict extremely painful lacerations and envenomation. The sting is rarely life-threatening to healthy adults but requires prompt medical attention.
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