Izvestiya of Saratov University.
ISSN 1816-9775 (Print)
ISSN 2541-8971 (Online)


fishes

Retrospective Analysis and the Current State of the Fauna of the Cyclostomes and Bone Fishes of the Saratov Region

Dynamics and current state of cyclostomes and fish fauna of Saratov region is analyzed, on the basis of modern field research, collectible information and literature data. As a result of regulation of large and small rivers of the region, a significant restructuring of their ichthyocenoses took place. The overall index of changes in the species composition of the ichthyofauna was 49%, the final list (at the end of the observations) was 42%, and the index of intrapopulation changes was 51%.