Research on the environmental quality in Vâlsan River based on the macrozoobenthic analysis.

Vâlsan River is the only ecosystem in the world populated with Romanichthys valsanicola (asprete), a tertiary relict, with a very limited area of distribution, included in the Red List of U.I.C.N –Resolution D-46 of the CE, as critically endangerd species. Currently, Vâlsan River undergoes a cumulative effect of disturbances upstream, due to hydraulic improvements or human activity. It also affects the water quality and quantity, which requires taking emergency measures to mitigate it. This paper synthesizes and processes personal data on the structure of benthic zoocenosis of Vâlsan River during 2001-2015, aiming at setting the environmental status and water quality, especially through analysis of Ephemeroptera fauna.