DISTRIBUTION OF STONE MOROKO ( <i>PSEUDORASBORA PARVA</i>) IN THE UPPER DON BASIN
Distribution of Stone Moroco ( Pseudorasbora parva ) in the basin of the Upper Don is discussed in the paper. It is suggested that the fish can settle in two ways: from piscines through the Sosna River and from the lower reaches of the Don. There are pessimal living conditions for the Stone Moroco in the study area that is proved by extremely low fertility of the species, a low share in fish population of the rivers and absence of its movement into the next waterways. At present the northern border of invasive range of the Stone Moroco goes across the Lipetsk Region along the basin of the Sosna River.