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Limnology and Primary Production of Kaptai Lake, Bangladesh

G.C. Haldar
Fisheries Research Institute, Riverine Station, Chandpur 3602, Bangladesh.

M.A. Mazid
Fisheries Research Institute, Riverine Station, Chandpur 3602, Bangladesh.

K.K. Ahmed
Fisheries Research Institute, Riverine Station, Chandpur 3602, Bangladesh.

Abstract/ Executive Summary:

Seasonal variations in different physicochemical and climatic/actors of Kaptai Lake, and the degree of correlation among these factors are presented. The lake water was slightly alkaline and hard. In the monsoon months (June-September), water transparency was low due to high turbidity. Physicochemical values were normally high in the winter and post winter months, Both direct and inverse correlations were found among the various parameters. A higher productivity was observed during the premonsoon period, when the reservoir had the lowest water level. Gross energy production ranged from 1848 to 8 186 MJ/m² per year; average gross carbon production was 135 g/m² per year. Primary productivity was inversely correlated (r = -0.88, p<0.001) to water level.

Keywords: Limnology, Production, Kaptai Lake, Evaluate

Location: Rangamati, Balukhali, Subalong, Kaptai, and Naniarchar

Start Date: 00-04-1988

End Date: 00-03-1989

Program Area: Resource Development and Management

Non-commodity: Performance

Objectives:

To evaluate the potential productivity of the lake and to provide information for fisheries development and management planning.

Methodology:

The study was conducted from April 1988 to March 1989. Water samples for physicochemical parameters were collected from five sampling stations (Rangamati, Balukhali, Subalong, Kaptai, and Naniarchar). Water level and rainfall data were obtained from the hydroelectric power project at Kaptai Air and water data were obtained from the hydroelectric power project at Kaptai. Air and water temperatures were recorded using a glass thermometer and water transparency was measured by Secchi disk. Other parameters, such as pH, dissolved oxygen, free carbon dioxide, total hardness, alkalinity, chloride, nitrite, ammonium nitrogen, ammonium ion, and ammonia were estimated with a HACH test kit (Model FF-l A).Primary productivity was estimated by the light-and-dark-bottle technique (Benton and Werner 1965) incubated for 24 h. The results obtained from the Winkler titration were extrapolated using an oxycalorific coefficient of 3.51 (Winberg 1960) to calculate energy production (in MJ/m² per day). The plankton biomass, organic matter, and carbon production were calculated on the basis of gross 02 production (g 02) using the following formulae: carbon = g 02 X 0.375 (g); organic matter = g 0₂ X 0.690 (g); and plankton biomass = g 0₂ X 3.300 (g).

Source of Information:

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The lake water was slightly alkaline and hard. In the monsoon months, water transparency was low due to high turbidity. Physicochemical values were normally high in the winter and post winter months, Both direct and inverse correlations were found among the various parameters. A higher productivity was observed during the premonsoon period, when the reservoir had the lowest water level. Gross energy production ranged from 1848 to 8 186 MJ/m² per year; average gross carbon production was 135 g/m² per year. Primary productivity was inversely correlated (r = -0.88, p<0.001) to water level.

Knowledge Management: Journal