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An Assessment of Vital Water Quality Parameters of Teesta River Closest to Barrage Region in Lalmonirhat District of Bangladesh

AKM Rohul Amin
Department of Fisheries Biology and Genetics, Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh

Md. Abu Zafar
Assistant Professor
Department of Aquaculture, Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh

Md. Shafiullah Abbus
Department of Fisheries Biology and Genetics, Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh

Muhammad Badruzzaman
Department of Biochemistry and molecular Biology, Bhangabondhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh

Imran Hoshan
Department of Fisheries Biology and Genetics, Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh

Abstract/ Executive Summary:

This study was conducted to monitor the key water quality parameters of Teesta river ecosystem closest to Teesta barrage from July 2018 to April 2019 (10 months) situated in the Lalmonirhat district of Bangladesh. Water samples were collected twice in every month from different six sampling sites selected from the upstream and downstream regions of the barrage. Monitored minimum temperature (21.67 ºC) was recorded in the month of January and it was maximum in the month of July (32.03 ºC). Gradual increase of temperature was recorded from March to July (early monsoon) indicated that water temperature was normally uplifted according to the seasonal change. The observed dissolve oxygen level showed relatively in the month of July (6.5 mg/l) and higher in the month of January (8.1 mg/l). Average temperature and dissolved oxygen fluctuations were significantly (p< 0.05) varied among different sampling months. Inverse relationships were observed between water temperatures and dissolve oxygen level. It is important to note that downstream region of barrage had slightly higher DO level than the upstream region that might the impact of barrage water flow. The recorded pH revealed that slightly alkaline pH level found in all the year round (7.1 to 7.7). Besides, both nitrate-nitrogen and phosphate- phosphorous levels were observed little higher in the late monsoon. The findings of this study suggested that better ecosystem health (temperature, pH and abundance of plankton) was observed in early monsoon season.

Keywords: Teesta River, Water quality, Ecosystem, Barrage region

Location: Lalmonirhat district of Bangladesh.

Start Date: 00-07-2018

End Date: 00-04-2019

Program Area: Resource Development and Management

Commodity: River

Objectives:

To understand the health status of Teesta river ecosystem near barrage region.

Methodology:

The proposed research work has been carried out in the upstream and downstream regions of Teesta barrage in Teesta river where six different sampling sites from both upstream and downstream regions of the barrage were selected. Sampling was done twice per month from July 2018 to April 2019. From every sampling point, water temperature, dissolved oxygen (DO), pH, nitrate (NO_3-N), and phosphate (PO_4-P) ion concentration were measured. One-way Analysis of Variance (ANOVA), Post Hock and Duncan tests were performed to compare the data and significance level. Differences were regarded as significant when P< 0.05. All analyses were done using SPSS 22.0.

Source of Information: International Journal of Fisheries and Aquatic Studies; 8(6): 92-95; 2020.

Article Link (Online Journal): DOI: https://doi.org/10.22271/fish.2020.v8.i6b.2365

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The findings of this study demonstrated that the monitored productivity indicators particularly the availability of planktonic flora and fauna showed comparative better conditions in early monsoon and monsoon season than pre-monsoon and late monsoon season. Water temperature was recorded maximum in monsoon season specifically in the month of July when dissolved oxygen level was decreased. The downstream region of the barrage had a slightly higher DO level than the upstream region. Teesta riverine ecosystem in the barrage region contained slightly alkaline pH all year-round. Finally, it can be concluded that it is very essential to take all effective necessary actions to prevent manmade interventions for providing good ecosystem health in the Teesta river.

Knowledge Management: Journal