Żwawik Czerwieniak - a freshwater species that lives in natural conditions flowing through the territory of Brazil, Paraguay and Argentina, the Paraná River, its tributaries and surrounding streams. These are shaded sections, with rich vegetation, sandy soil and slow current. The fish is characterized by a bluish-silvery coloration of the body, with a reddish lower abdomen in the part where the anal fin is located. All fins, with the exception of the pectoral fins, are transparent and red. The species has a visible fat fin. The female is thicker in the abdominal parts, while the first rays of the male anal fin are transformed into the so-called partner hooks that allow holding a female during reproduction.
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