Red and Black Sailfin Pacu (Tometes siderocarajensis)


A recently described species from the Tocantins-Araguaia drainage in Eastern Brazil, the Red and Black Sailfin Pacu (Tometes siderocarajensis) inhabits rapids and fast-moving waters in the wild. A recent offering in the aquarium hobby, this large growing relative of the more well-known silver dollars and pacu develops incredible coloration, with adults exhibiting deep black throughout most of the body and fins interspersed with vivid red splotches along the body that intensify when the fish are in breeding condition. Like most of their relatives, this species is an omnivore which feeds on a substantial amount of fruits, nuts, and plant/vegetable matter in the wild and should be offered a varied diet for optimal growth and coloration. While the Red and Black Sailfin Pacu does not grow to the enormous size reached by other Pacu species, it is still a large and powerful swimmer as an adult and should be kept in an appropriately large aquarium with lots of open space and moderate to strong current.


Red and Black Sailfin Pacu (Tometes siderocarajensis)

Origin: Wild Brazil
Locale: Rio Tocantins
Diet: Omnivore, feeds largely on fruit and nuts in the wild. Will accept most prepared foods in the aquarium.
Adult Size: 11″+
Recommended Tank Size: 120 gallons+
Compatibility: Generally peaceful, but may intimidate smaller or slower-swimming tankmates. Best kept with similarly sized large fish.

Preferred Water Parameters
pH:                          6.5 – 7.2
Temp:                     76-82F
Ammonia:              0ppm
Nitrite:                    0ppm
Nitrate:                  <30ppm

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