Характеристика видового багатства риб річок Північно-Західного Приазов’я за ділянками

Species diversity of fish in upper, middle and lower reaches of rivers
vary in a certain way. The main reason of this is difference in the degree of water body transformation. The fish species diversity in lower reaches of the rivers is associated with the condition of their mouth areas. The highest diversity is supported by the rivers flowing directly into the Sea of Azov.