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Temporal Variation of Physicochemical Parameters in Kaptai Lake, Bangladesh

Md. Mosaddequr Rahman
Faculty of Fisheries, Kagoshima University, 4-50-20 Shimoarata, Kagoshima 890-0056, Japan

Md. Abul Bashar
Riverine Sub-station, Bangladesh Fisheries Research Institute, Rangamati-450

Zannatul Farhana
Faculty of Fisheries, Kagoshima University, 4-50-20 Shimoarata, Kagoshima 890-0056, Japan

Md. Yeamin Hossain
Department of Fisheries, Faculty of Agriculture, University of Rajshahi. Rajshahi 6205, Bangladesh

Abstract/ Executive Summary:

The present investigation was conducted to reveal the physicochemical status of Kaptai Lake, Bangladesh. Water samples were collected from five sampling stations (Rangamati Sadar, Kaptai, Barkal, Langadhu and Naniarchar upazilla) over a period of 12 months from July, 2012 to June, 2013. Air and water temperatures were estimated using centigrade thermometer, transparency using secchi disk while pH, CO, total alkalinity, total hardness and dissolved oxygen (DO) were estimated using HACH water testing kit. Temporal variations in physicochemical parameters were found in all cases. Highest air temperature (30.9°C)was recorded in June, 2013 and the lowest (23.1°C) in January, 2013. On the other hand, the water temperature varied from 21.1°C in January, 2012 to 32.8°C in July (27.09±5.89°C). The pH of water always found to be alkaline in nature and varied between 6.9 in July and 7.6 in May (7.6±0.52). The maximum free CO value (3.32 mg/l) was2recorded in May and minimum value (2.36 mg/l) in November. The value of total alkalinity was found to fluctuate from 51.9 mg/l in December to 65.2 mg/l in March (59.45±6.71 mg/l). Hardness of lake water varied from37.8 mg/l in August to 47.3 mg/l in November with a mean value of 43.08±5.51 mg/l. Water transparency ranged from 0.97 m in July to 2.43 m in May with a mean value of 1.94±0.57 m. The value of dissolved oxygen (DO) was found to fluctuate from the minimum value of 6.10 mg/l in June to the maximum value of 6.80 mg/l in November with a mean value of 6.41±0.51 mg/l. The physicochemical parameters of lake water were found to be within suitable limits for the survival of aquatic flora and fauna including fish production. The present research provides baseline information on monthly variations of physicochemical parameters of Kaptai Lake which will be effective for sustainable management and conservation of this important lake ecosystem.

Keywords: Kaptai Lake, Physicochemical Parameters, Temporal Variation, Bangladesh

Location: Bangladesh

Start Date:

End Date:

Program Area: Socio-economic and Policy

Commodity: Wetland

Objectives:

This article aims to provide data on variations of physicochemical parameters of Kaptai Lake over a period of one year to provide baseline information for assisting management decisions of Lake Ecosystem.

Methodology:

Study site and sampling: Present study was conducted from July, 2012 to June, 2013. Five sampling stations (Rangamati Sadar, Kaptai, Barkal, Langadhu and Naniarchar upazilla) were selected taking 3 aspects into consideration: i) the streams and drainage arms, ii) catchment area and iii) water level of the lake. Water samples for physicochemical parameters were collected fortnightly from each sampling station with water sampler bottle during morning hours. Study of Water Quality Parameters: Air and water temperatures were recorded by a centigrade thermometer while water transparency was measured through Secchi disc. Dissolved Oxygen (DO), pH, free CO, total alkalinity, total hardness of water were measured by using HACH water testing kit (Model: FF-3, USA).

Source of Information: World Journal of Fish and Marine Sciences 6 (5): 475-478, 2014ISSN 2078-4589

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The present study revealed that the water quality of Kaptai Lake is still in good condition in spite of taking wastes from several anthropogenic chemical sources. The present study is a baseline study on monthly variation of physicochemical variables of the Kaptai Lake which will provide effective information for the Lake Ecosystem management and conservation. The findings of the present study will be helpful for the future researcher to work on these aspects and replace the discrete data about physicochemical variables of Kaptai Lake and establish a faithful document explaining variation and inter-relation among different physical and chemical parameters of Kaptai Lake ecosystem

Knowledge Management: Journal