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In the upper reaches of the Dnipro it was found a Danube ruffe population. It differs from the population of the middle reaches of the Dnipro by a longer caudal peduncle. The Danube ruffe differs from sympatric populations of the common ruffe by 10 features. For a fast and precise identification of these two species, it was proposed to use the height of the membrane between the first and second rays of the anal fin as a percentageto the length of the body

The Morphological Characteristics of the Danube Ruffe, Gymnocephalus baloni (Perciformes, Percidae), in the Upper Reaches of the Dnipro River, Ukraine