Abstract
<p>Substantial changes in the hydroecosystem of the Zaporizke reservoir have led to a significant transformation of aquatic<br />biocoenoses. As a result, number of some aboriginal fish species have decreased. The regulation of the Dnipro river has<br />contributed to the spread of new species of fish. Over the past 30 years, the ichthyofauna of the reservoir has gained about 20<br />species of fish that acclimatized and expanded their range. The article presents the results of ichthyological research of 2010-<br />2016. The article determines main causes of the spread of new species of fish, and gives the results of complex monitoring<br />studies on the number and biomass of young alien fish species of the Zaporizke reservoir. It was found that the most numerous<br />first summer individuals of alien fish species are big-scale sand smelt Atherina pontica (Eichwald, 1831), Prussian carp Carassius<br />gibelio (Bloch, 1782), topmouth gudgeon Pseudorasbora parva (Temminck et Schlegel, 1846), black-striped pipefish (Syngnathus<br />abaster Risso, 1826) and pumpkinseed Lepomis gibbosus (Linnaeus, 1758).</p>
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