Saprobility of the Upper Mountain Rivers of the Nakhchivan Autonomous Republic

In 2022, as a result of faunistic studies carried out in the Alindjecay basin, 13 species of macrobenthos very sensitive to organic water pollution of macrobenthic organisms were found in the upper mointain r. Arafsachay and r. Lekatagchay macrobenthos. It was found that in samples taken from different biotopes of r. Arafsachay and r. Lekatagchay oligosaprobic (S = 0.50-1.50) and β-mesosaprobic (S = 1.56-2.50) species of bottom organisms differ in frequency of occurrence by 20-50%, in number and biomass. The article contains brief information on the biomorphological features, biology, and distribution of Epeorus assimilis, Perlodes dispar and Rhyacophyla nubila. According to the species of saprobic macrobenthos organisms, the waters of both tributaries of the river. Alindzhechay can be considered ecologically clean, fully suitable for drinking and other purposes.