Identification of macrobenthos in the proximal part of the Kan River, Tehran province

The present study identified macrobenthos in the proximal part of the Kan River in the summer and autumn of 2015. Five stations in the study area are selected including top area of Shrine Davood, Shrine Davood, Rendane, Holy Noorbakhsh and Sooleghan. The geographic location of each site was recorded using GPS system. Sampling was done by quadrat seasonally. The highest prevalence of macrobenthos was in the summer. Maximum frequency in summer was observed in Noorbakhsh station with 142 samples of macrobenthos, but Sooleghan station with 12 samples of macrobenthos has minimum frequency. Among the identified species, class Insecta has the most frequency (99.2%) and class oligochaeta has the less frequency (0.8 %). Also, Culex sp. has the most abundant per square meter (213 sample per square meter) and Lumbricus terrestris and Tipula sp. has the less abundant (2 sample per square meter). According to a bio-indicator values of HFBI, water quality of Kan River is medium in top area of Shrine Davood and relatively poor in other stations.