Determining the water quality of the Tajan River (Sari City) to select the release station for economic fish juveniles of the Caspian Sea (2022)

Nasrollahzadeh Saravi, Hassan; Pourang, Nima; Safari, Reza; Makhlough, Asieh; Afraei Banpei, Mohammad Ali; Nematollahi, Mohammad Javad; Baloei, Mahdieh; Kardar Rostami, Mohammad; Ahmadnezhad Chehreh, Ahad

doi:10.22034/KJES.2023.9.1.106511

Volume 9, Issue 1 (Spring & Summer 2023) KJES 2023, 9(1): 207-226 | Back to browse issues page

‎ 10.22034/KJES.2023.9.1.106511

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Nasrollahzadeh Saravi H, Pourang N, Safari R, Makhlough A, Afraei Banpei M A, Nematollahi M J, et al . Determining the water quality of the Tajan River (Sari City) to select the release station for economic fish juveniles of the Caspian Sea (2022). KJES 2023; 9 (1) :207-226
URL: http://gnf.khu.ac.ir/article-1-2872-en.html

Determining the water quality of the Tajan River (Sari City) to select the release station for economic fish juveniles of the Caspian Sea (2022)

Hassan Nasrollahzadeh Saravi ^*

¹, Nima Pourang²

, Reza Safari³

, Asieh Makhlough³

, Mohammad Ali Afraei Banpei³

, Mohammad Javad Nematollahi⁴

, Mahdieh Baloei³

, Mohammad Kardar Rostami³

, Ahad Ahmadnezhad Chehreh³

1- Caspian Sea Ecology Research Center, Iranian Fisheries Science Research Institute, Agricultural Research, ‎‎Education and Extension Organization, Sari, Iran. , hnsaravi@gmail.com
2- Iranian Fisheries Science Research Institute, Agricultural Research, ‎‎Education and Extension Organization, Sari, Iran.
3- Caspian Sea Ecology Research Center, Iranian Fisheries Science Research Institute, Agricultural Research, ‎‎Education and Extension Organization, Sari, Iran.
4- Geology Dep., Faculty of Science, Urmia University, Urmia, Iran

Abstract: (215 Views)

Globally, rivers are under tremendous anthropogenic stress caused by stream fragmentation, land use changes, and regulation and water quality has been widely declined. In a review of studies, the integrity of flowing water systems largely depends on their natural dynamic characteristics, which sustain habitat. In this study, the physical and chemical factors of the Tajan River water, which is the habitat of various fishes and where the release of some economic fishes of the Caspian Sea takes place, are investigated in 7 stations during the year 2022. The results of the physical and chemical parameters such as water temperature, pH, electrical conductivity, total suspended solids, turbidity, dissolved oxygen, biochemical oxygen demand, chemical oxygen demand, ammonium, nitrite, nitrate, phosphate, water quality index and comprehensive pollution index were recorded as 14.50-32.00 °C, 6.48-12.24, 562-10020 µs/cm, 2.35-185.71 mg/l, 1.8-328 NTU, 1.01-14.11, 0.58-16.05, 2.39-50.21, 0.020-1.028, 0.005-0.771, 0.49-58.56, 0.010-1.610 mg/l, 17.0-75.0 and 1.20-7.33, respectively. Based on the principal component analysis, the biochemical oxygen demand, nitrite, nitrate, and phosphate variables are in the first component, which is more important in the Tajan River. Also, based on the step-by-step regression analysis of the water quality index, the most effective variable was recorded biochemical oxygen demand, turbidity, and phosphate, and according to the comprehensive pollution index, the water quality of this river was dependent on the variables of phosphorus, phosphate, and nitrate. Finally, based on the physical and chemical parameters and various water use indicators, the Tajan River is unsuitable for fish life. Based on various indicators, station one (placed in a separate group in the cluster test) compared to other stations has more suitable conditions for releasing fish juveniles.

Keywords: Physicochemical, Water Quality Index, Choosing a release station, Tajan River, Sari

Full-Text [PDF 1096 kb] (141 Downloads)

Type of Study: Original Research | Subject: Environmental Geology
Received: 2023/05/24 | Accepted: 2023/08/23 | Published: 2023/09/17