Hydrology and hydrobiology of the Haraz River

The Haraz River (Sorkh roud) is situated in geographical long (52 ֯ 21 – 51 ֯ 21) and width (33 ֯ .26 - 36 ֯ .42). The area of watershed in lithosphere is 4045 km2. The water of river is supplied by surface water and underground water. The maximum of water debit occur in April and May. The water of Haraz River were used for irrigation of the most part of rice field. The survey showed that the value of oxygen is adequate for aquatic in throughout, and the pH is very weak alkaline and perhaps the weakest alkaline. The aquatic plants of river included four groups such as water side meadow; marginal plant, floating plant and submerged plant (weeds). The phytoplankton of river consist of 4 phylum, 21 families and 33 genus, also 7 order and 2 class or benthic organisms was identified. The river fishes belong to 20 species and 8 families. The fishes are populated of 30 percent immigrant and 70 percent native fish......