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Changing Trends of Physicochemical Parameters in Kaptai Lake of Bangladesh.

Md. Abul Bashar
Bangladesh Fisheries Research Institute, Riverine (Lake Fisheries), Sub-station,Rangamati-4500, Bangladesh.

S Sanjib Basak
Bangladesh Fisheries Research Institute, Riverine (Lake Fisheries), Sub-station,Rangamati-4500, Bangladesh.

Kazi Belal Uddin
Bangladesh Fisheries Research Institute, Riverine (Lake Fisheries), Sub-station,Rangamati-4500, Bangladesh.

AKM Saiful Islam
Bangladesh Fisheries Research Institute, Riverine (Lake Fisheries), Sub-station,Rangamati-4500, Bangladesh.

Yahia Mahmud
Bangladesh Fisheries Research Institute, Riverine (Lake Fisheries), Sub-station,Rangamati-4500, Bangladesh.

Abstract/ Executive Summary:

Physicochemical parameters were studied for a period of two years from July 2012 to June 2014. The parameters namely air and water temperature were estimated using centigrade thermometer, transparency using secchi disc while pH, CO2, total hardness, total alkalinity, dissolved oxygen (DO) were estimated using HACH water test kit. The highest air and water temperature (31.52°C and 30.38°C) were recorded in September, 2013 whereas the lowest air and water temperature 21.04°C and 20.42°C were recorded in January, 2014. The pH of water was found to alkaline in nature (6.9 to 8.20). The maximum free CO2 value (7.81 mg/l) was recorded in February, 2014 and minimum (2.36 mg/l) in November, 2012.The value of total alkalinity was found to fluctuate from 51.9 mg/l in December 2012 to 90.68 mg/l in December 2013. Total hardness of lake water varied from 37.8 (August) to 47.3 (November) in 2012 and 55.17 (July) to 87.49 (February) in 2013-14 with regular trends in fluctuation. Mean secchi disc reading varied from 1.94±.57 m in 2012-13 and 2.02±0.40 m in 2013-14. Dissolved oxygen was found to vary from 6.10 (February) to 6.80 (November) during 2012, 3.90 (February) to 6.38 mg/l (July) during 2013 with a mean value of 6.4±1.51 and 5.74±0.68 mg/l. Water depth was found to fluctuate from 4.39 to 11.76 m with a mean value of 7.96± 2.56 m for one year study. The present research provides baseline information on changing trends of physicochemical parameters of Kaptai Lake which will facilitate sustainable management and conservation of this lake ecosystem.

Keywords: nland fishery, Water chemistry, Kaptai Lake, Bangladesh

Location: Kaptai Lake the Southeastern Part of Bangladesh.

Start Date: 00-07-2012

End Date: 00-06-2014

Program Area: Conservation and Biodiversity

Non-commodity: Impact

Objectives:

To elucidate the changing trends of physicochemical parameters of this lake over a period of two years.

Methodology:

The study was conducted in Kaptai Lake the Southeastern Part of Bangladesh from July 2012 to June 2014. Five sampling stations of this lake namely; Rangamati Sadar, Kaptai, Barkal, Langadhu and Naniarchar Upazilla were selected taking into consideration: (i) the following streams and drainage arms, (ii) their catchment area, and (iii) shallow, medium and deep water levels of the lake. Water samples for physicochemical parameters were collected fortnightly from each sampling station with water sampler bottle during morning between 8.30 to 10.30 a.m. Air and water temperature were recorded at the sampling sites whereas the others were recorded in the laboratory. Temperature of water and air were recorded by a centigrade thermometer. Water transparency was measured through secchi disc reading. Dissolved Oxygen, pH, free CO2, total alkalinity, total hardness of water were measured by using HACH water testing kit. Rainfall and water depth were collected from Power Development Board (PDB) at Kaptai office, Rangamati district, Bangladesh. Statistical analysis were applied to find out the standard deviation of different parameters in different months and to determine the extent of correlation amongst different parameters.

Source of Information: Res. Agric. Livest. Fish. ,Vol. 2, No. 2, August 2015: 319-327 (ISSN : P-2409-0603, E-2409-9325)

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The present study is baseline study on changing trends of physicochemical parameters of the Kaptai Lake which will prove effective in case of 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 water quality parameter of Kaptai Lake and establish a crystal clear and precise document explaining variation and inter-relation among different physicochemical parameters of Kaptai Lake.

Knowledge Management: Journal