Curuá Una

This species is a popular aquarium fish and is bred on a commercial basis in several countries, with a selectively-bred albino form also available. Wild specimens are rarely collected due to the low price of the farmed fish, but the origin of the commercial strain is questionable. The species was considered endemic to the rio Tapajós basin, but in the early 1990s fish appearing identical to the aquarium form were photographed in the...

Metynnis lippincottianus is occasionally seen for sale, sometimes under the name of "Silver Dollar". It is easily distinguishable from m. argenteus and m. hypsauchen (which are more commonly sold as Silver Dollars) by its spotted pattern, hence the common name. M. lippincottianus shares a common name with m. maculatus but the two can be distinguished as the spots on m. maculatus are more pronounced. Silver dollars are common and popular fish in the hobby. They are related to piranh...

Currently known only from the rios Curuá Una and Uruará in Pará state, Brazil. The Curuá Una is a tributary flowing into the main lower Amazon channel downstream of Santarém and there is a large hydroelectric power plant constructed on it which supplies power to the city. The Uruará joins the Curuá Una around 30 km upstream of its mouth and confluence with the Amazon.