Potamotrygon motoro is a freshwater stingrays belongs to the family of potamotrygonidae. It's distribution is thorough and includes South America, Uruguay, Paraguay-Parana, Orinoco and Amazon river basins. It is about 39 centimeters and requires a large tank in adults. They thrive in a pH 5.0 to 6.0 and a DH is not greater than 10 Since it from a tropical climate, it is best at temperatures of 75 - 78 ° F. 
They are the fine aquarium specimens, as long as you keep the water right and parameters have enough filtration. Because of their size, when selecting a tank for them to attach greater importance to the bottom of depth, that is, if the rays will spend most of their time.
The motoro ray is the most commonly cultivated species of stingrays, it is also the most popular stingrays in the ornamental fish trade. These species reach sexual maturity to a relatively small size, about 12 cm. For this reason, that is easier motoro bred in the aquarium at home than any other types of stingrays that mature in 18 inches or greater.
An important consideration in mind is that all freshwater stingrays species can grow to a large, full size when grown. A freshwater aquarium stingrays should never be less than 50 gallons, since they will soon outgrow smaller aquariums. The growth rate for freshwater stingrays depends on how often and how much they are fed and the water quality. When a well-maintained aquarium with optimal nutrition, a freshwater stingrays reach maturity in about 3 years.
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