Investigating the effect of fish ponds on water quality of Ghezel Ozan river

Subject Areas : Water Resource Management

ali afshari ¹ , parisa Alamdari ² , Ahmad GholChin ³ , Mohammad Sadegh Askari ⁴

1 - PhD student, Department of Soil Science, Faculty of Agriculture, University of Zanjan, Zanjan, Iran. *(Corresponding Author)
2 - Associate Professor, Department of Soil Science, Faculty of Agriculture, University of Zanjan, Zanjan, Iran.
3 - Assistant Professor Department of Soil Science, Faculty of Agriculture, University of Zanjan, Zanjan, Iran.
4 - Assistant Prof., Department of Soil Science and Engineering, University of Zanjan, Zanjan, Iran

Received: 2021-08-15 Accepted : 2022-04-06 Published : 2022-04-21

Keywords: Food security, Pool, Water Resource Management, Aquaculture,

Abstract :

Background and Objective: Considering the importance of fish production and consumption in the human food chain and human food security, and on the other hand, the possible adverse effects of fish pond effluents on river water quality; the present study was carried out by considering the effect of fish farm effluents on river water quality, with a case study on fish farms along the Great Ghezel Ozan river (from Chehelcheshmeh mountains of Kurdistan province to Manjil or Sefidrood dam). Material and Methods: Fish farms were identified based on field surveys along the river. Sampling from a depth of 0 – 10 cm from the water surface in summer (2017) With 5 samples about 500 meters before the pools (control) that were not affected by fish farming activities and 5 samples in approximately100 – 150 meters after the pools (where the effluents of fish farms entered the river) was done. Sampling and analysis of physicochemical parameters such as temperature, pH, electrical conductivity (EC), Nitrate (NO3), Phosphate (PO4), Dissolved oxygen (DO) and Chemical oxygen demand (COD), according to the instructions in the standard methods book was done. Findings: The results indicated that the average values of the parameters in the input and output stations, respectively for pH (7.24 – 7.21), EC (2250.6 – 2282.8 dS/m), DO (7.41 – 6.94 mg/L), COD (24.94 – 29.63 mg/L), Temp (14.8 – 15.5 °C), NO3 (4.1 – 5.9 mg/L), PO4 (1.1 – 1.84 mg/L) was obtained. Discussion and Conclusion: In general, the process of acidity and oxygen parameters of the solution decreased, and the parameters of electrical conductivity, oxygen demand, chemical temperature, temperature, nitrate and phosphate, increased.

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