Abstract
There are nine alien species in the region of the study. The distribution and abundance of nonnative fish in the reservoirs of northwestern part of the Azov Sea basin depends on the scale of fishing industry activities, the degree of transformation of hydroecosystems, and the water release into the rivers from irrigation canals. There are three groups of species registered according to the number indices in the water areas of the basin. The first is the species the findings of which are rare in the region; the second group comprises fish the number of which depends on fishing industry activities; and the third one embraces the species that are high in the number and their self-reproducing populations exist.
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