Determination of biotic index and water quality of Anjireh river (Fars, Iran) In autumn using aquatic insects fauna

Insects are about 75% of identified animal species in the world and of which 3% are aquatic insects. Aquatic; Insects are differently sensitive to biotic and abiotic factors in environment. This study was carried out to calculate the biotic index of Anjireh river, Shiraz ( Fars province) using aquatic insects fauna during October, November and December of 2013. 18 Families were collected and identified in 12 Sample Sites of this river. The biotic index of the river was 5.91, which showed that the quality of this river was fairly poor.