Contamination of sediments with heavy metals Cd, Cu, Fe, Pb in the east of Anzali Lagoon

The surface layer of sediments in the east of the Anzali Lagoon was surveyed for heavy metal contamination during the year 2004 at the National Inland Water Aquaculture Institute. Samples were obtained by sediment sampler (Eckman Grab) from Pirbazar River, Pasikhan and Selkeh. The samples were dried and treated by wet digestion (HN0_3, H_2SO_4, HClO_4) under open reflux condition. Concentration of Pb, Fe, Cu and Cd were 7.92, 0.2775%, 25.8 and 1.645 kg/g dry weight respectively. The Fe and Cu have the highest concentration. We found that in the study area, Pirbazar was the most contaminated with the selected heavy metals

Physico-chemical survey of balikhly Chi River from outlat of Yamchi dam

These studies were conducted seasonally in 9 sampling period 1n 1991 to assess the physico-chemical parameter status of water of Balikhly chie river (the region after yamchi dam) of Ardabil Provence in relation to its potential for aquaculture development. Water samples were collected by rutner sampler and analyzed for temperature, turbidity, conductivity, total hardness, chloride, COD, CO_3 , HCO_3,Ca, mg ,TSS ,PO_4, NH_4 ,NO_2 ,NO_3, SiO_2, DO, SO_4 . The water quality showed temporal and spatial variation in this study .The result revealed that the water were slightly alkaline with high total hardness and bicarbonate alkalinity which indicate high buffering capacity to pH changes .the ranged of dissolve oxygen concentration were beetwin7.6 to 13.7 mg/l with mean value of 10.98mg/l which were above the permissible oxygen cocentratio over all study site. the mean water temperature was 17.79 and ranged between 1.6 to 19.6 that is suitable for cold water fish culture while seasonal temperature variation showed that winter is desirable for hatcheries and other seasons for culture practices. Electrical conductivity value ranged between 873 to 1502 with mean of 1135 falls within the limits of suitable salinity ranges for rainbow trout culture. The turbidity and TSS ranged between 20-60FTU and 60168mg/l respectively The level of TSS concentration were little higer than80 ppm lmits.The values obtained for physicochemical parameters in Balikhly chie river were in conformity with recommended values for fresh water fish farming standared. The fish production potential based on water divertion and oxygen concentration over four study site from yamchi dam to downstream without applying any aeration systems were 38.6, 27, 59 and 27 metric tons respectively