The Motoro Stingray, also known as the Ocellate River Stingray (Potamotrygon motoro), is one of the best-known South American freshwater stingrays in the aquarium hobby.
It is famous for its broad, rounded disc covered with distinctive:
ocelli surrounded by darker rings.
These eye-like markings can vary tremendously between individual fish and geographic populations, making every Motoro visually unique.
The species is distributed across an enormous portion of South America, including major river systems such as the:
Unlike marine stingrays, Potamotrygon motoro is a:
and does not require marine salt for normal long-term care.
The accepted scientific name is:
The species was described in:
by Müller and Henle.
It belongs to the family:
which contains the specialized freshwater stingrays of South America.
Although Potamotrygon motoro is currently recognized as a valid species, scientists have long noted that the name covers an:
Populations from different river systems may differ significantly in:
Additional taxonomic work may eventually divide portions of what is currently called P. motoro into additional species or geographic forms.
Therefore:
whenever the collection origin is known.
A typical Motoro Stingray develops a background color ranging from:
covered with distinctive circular:
An:
is an eye-like circular marking.
Motoro ocelli usually have:
These markings give the species its common name:
Different Motoro populations can display:
No two Motoro Stingrays are guaranteed to look identical.
Exact adult coloration cannot be guaranteed.
Appearance may change according to:
A young Motoro may develop substantially different contrast as it matures.
Potamotrygon motoro has one of the widest known ranges of any South American freshwater stingray.
Its distribution includes portions of the:
Records attributed to P. motoro occur across numerous South American countries, including:
Some older records from other regions require taxonomic caution because of the complexity of the Motoro species group.
Motoro Stingrays inhabit freshwater environments including:
They spend much of their lives close to the bottom.
For most Motoro aquariums:
A ray naturally:
Do not use substrate capable of cutting or abrading the disc.
Avoid:
The underside of a freshwater stingray is soft and vulnerable.
A stingray does not use aquarium space like a tall-bodied fish.
Its most important dimension is:
A tank can contain hundreds of gallons and still be unsuitable if it is:
FishBase currently documents Potamotrygon motoro reaching approximately:
and published total-length reports approach:
including the tail.
Because Motoro populations vary and females can grow larger than males:
Do not select an aquarium based only on the ray's juvenile size.
Your previous recommendation of:
is a responsible permanent recommendation for a full-grown Motoro.
I would keep it.
For an adult:
is an excellent starting footprint.
Larger is better.
If a ray develops a:
a 24-inch-wide aquarium is obviously not sufficient.
The animal needs room to:
For large adult Motoro rays:
Keeping multiple adult stingrays dramatically increases space requirements.
A group requires additional:
For several adult rays:
A Motoro aquarium should prioritize:
Use décor sparingly.
Suitable additions can include:
but leave extensive open sand.
Anything inside the aquarium should be evaluated from the perspective of a soft-bodied ray.
Avoid:
Heaters and filter intakes should be arranged so the ray cannot:
Large rays are powerful animals.
Freshwater stingrays are especially intolerant of poor water quality.
Maintain:
and keep:
A target below approximately:
is preferable when practical.
The older page suggested:
I would not use that as the goal for freshwater stingrays.
These are expensive, sensitive, high-bioload fish.
Instead:
through:
A practical captive range is:
Stable temperature is more important than trying to hit one exact number.
A practical captive pH range is approximately:
Wild populations occur across an enormous geographic range, so natural water chemistry varies.
Avoid sudden pH changes.
Motoro Stingrays are:
Routine salt addition is:
for normal long-term maintenance.
Provide:
through:
A large ray uses substantial oxygen.
One adult Motoro can produce:
especially because it consumes large quantities of animal protein.
Plan filtration for:
not the juvenile.
Recommended systems generally include:
Mechanical filtration should be serviced frequently.
Regular large partial water changes are essential.
Exact frequency depends on:
A large adult ray aquarium may require:
to maintain excellent conditions.
The Motoro Stingray is:
Its natural diet includes aquatic animal prey such as:
Excellent captive foods include:
The current listed specimen is eating:
which is a suitable component of a varied stingray diet.
However, do not feed only one food indefinitely.
A good rotation might include:
Dietary variety helps prevent nutritional imbalance.
Live feeder fish are generally unnecessary.
They can introduce:
Quality frozen, fresh and prepared foods are safer.
Young stingrays have:
Juveniles often benefit from:
as appropriate for their size and body condition.
Healthy adults can usually be fed less frequently than young juveniles while receiving larger portions.
Avoid:
because excess animal protein can rapidly damage water quality.
A healthy ray should have a well-filled body without:
A visibly thin ray should be investigated quickly.
Potential tankmates in a sufficiently large aquarium may include carefully selected:
Small tankmates may eventually become:
The Motoro is a predator.
Do not combine rays casually with fish likely to:
Persistent aggression can cause serious injuries.
Special caution is necessary when keeping freshwater stingrays with:
Some suckermouth catfish may attach themselves to a ray's disc and rasp the protective tissue.
This can cause:
For this reason:
even in very large aquariums.
Freshwater stingrays are relatively easy to sex.
Males possess:
These are paired reproductive structures located beside the pelvic fins.
Even juvenile males develop visible claspers.
Females:
The current product listing identifies the ray as:
Females should be expected to have:
Motoro Stingrays do not lay externally deposited eggs.
They reproduce through:
meaning the young develop inside the female and are born as:
During mating:
Male freshwater stingrays can become extremely persistent.
Courtship may cause:
The female should generally be:
and breeding pairs must be monitored carefully.
Published and aquarium reports vary by:
Captive gestation is generally measured in:
rather than days.
Do not advertise one exact gestation period as universal for all Motoro populations.
Motoro litter sizes are highly variable.
Published biological studies report:
with some populations producing considerably larger litters.
Scientific reports have documented ranges reaching:
depending on population and study.
Aquarium litters are frequently smaller.
Developing pups receive additional nourishment from:
produced by the mother.
This specialized reproductive system helps produce relatively large, fully formed pups.
Different Potamotrygon species can potentially:
If preserving pure species lines is important:
If intentional or accidental hybridization occurs:
Do not sell mixed-parentage stingrays as pure Potamotrygon motoro.
This is the most important safety issue on the entire page.
Motoro Stingrays possess:
used defensively.
A sting can cause:
The spine is primarily:
Most injuries occur when a stingray feels:
However, an aquarium keeper must always respect the tail.
Never:
Whenever possible:
Experienced keepers move rays by carefully guiding them into:
A net can become tangled around:
causing injury to both:
Freshwater stingrays periodically:
A discarded spine on the aquarium bottom can remain:
Use caution when:
A stingray puncture should be taken seriously.
If someone is struck:
Medical professionals may need to evaluate:
Do not assume a small puncture is harmless.
Freshwater stingrays can be unusually sensitive to medications.
Use caution with:
Do not automatically dose a ray aquarium using the same medications and concentrations used for ordinary freshwater fish.
When treatment is necessary:
and consult an aquatic veterinarian when appropriate.
Potamotrygon motoro is currently assessed globally as:
The most recent global assessment is from:
The species is:
and some individual geographic populations may be much more restricted than the species name suggests.
Responsible sourcing remains important.
Motoro Stingray CITES status requires careful wording.
Do not simply state:
because the listing is geographic.
The:
is listed under:
Brazil has listed:
from Brazilian populations in:
except populations/species already covered by Appendix II listings.
This means Brazilian P. motoro can fall under that Appendix III listing.
Appendix III is different from Appendix I or Appendix II.
It involves a country requesting international assistance in monitoring and controlling trade in a protected population.
It does:
However, international movement can involve documentation requirements depending on:
Freshwater stingrays are:
Some states regulate the entire family:
Texas lists:
as harmful or potentially harmful exotic fish.
Therefore:
unless the transaction qualifies under applicable state authorization or permitting.
Florida currently classifies:
as:
These are not ordinary unrestricted personal-pet species.
Applicable permits and conditions may be required.
Other states and local jurisdictions may also regulate freshwater stingrays.
Laws can change.
The buyer must verify legality before ordering.
The Motoro Stingray combines:
into one of the most impressive freshwater aquarium animals available to experienced keepers.
Before purchasing a Motoro Stingray:
The currently accepted scientific name is:
Classification:
For this product, use:
CITES coverage for Potamotrygon motoro is:
Colombian P. motoro is listed in Appendix III.
Brazilian populations of Potamotrygon that are not already covered by Appendix II species listings are also included in Appendix III under Brazil's listing.
The specific documentation required for international trade depends on:
Domestic U.S. possession rules are separate from CITES international-trade rules.
The Motoro Stingray possesses a:
that can cause serious injury.
Purchasers must understand and accept the additional safety responsibilities involved in keeping freshwater stingrays.
This species is recommended only for:
with appropriate:
Live freshwater stingrays require specialized professional packing.
Shipping availability depends on:
Larger stingrays may require:
Please review our Shipping & Payment Information and Live Arrival Guarantee / DOA Policy before ordering.
Customers are responsible for confirming that Potamotrygon motoro may legally be:
at their destination before ordering.
Being available for purchase on our website does not guarantee that freshwater stingrays are legal in every state or local jurisdiction.
Jason's Plecos & Cichlids reserves the right to cancel or refuse an order when legality cannot be confirmed.
Never release a Motoro Stingray into:
If permanent care becomes impossible, contact:


















