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Studies on Some Physico-chemical Factors of Kaptai Lake

K.K. Ahmed
Riverine Sub-station, Bangladesh Fisheries Research Institute, Rangamati 4500, Bangladesh

M.E. Haque
Riverine Sub-station, Bangladesh Fisheries Research Institute, Rangamati 4500, Bangladesh

M.K.I. Haque
Riverine Sub-station, Bangladesh Fisheries Research Institute, Rangamati 4500, Bangladesh

Abstract/ Executive Summary:

The present investigation dealt with the climatic and some physico-chemical conditions of the Kaptai lake with respect to their monthly variation. Air temperature was found always higher than water temperature. Vertical variation in temperature (0.8-4.7°C) was observed in all months. The water level fluctuate appreciably throughout the year. Wide seasonal fluctuations were also noted in water transparency. The lake was found to be slightly hard and alkaline pH. Dissolved oxygen (DO) (6.4-9.1 mg/l) and free carbondioxide (4.7- 6.0 mg/l) contents showed favorable condition for aquatic lives. DO at different depth showed no wide variation (1.0-2.4 mg/l). Conductivity ranged between 91.9± 7.1 and 106.4 ±5.2 mS/cm.

Keywords: Kaptai lake, Water quality, Physico-chemical factors

Location: Kaptai lake

Start Date: 00-05-1990

End Date: 00-04-1991

Program Area: Resource Development and Management

Non-commodity: Performance

Objectives:

To formulate a sound management policy for Kaptai lake fishery

Methodology:

The present study was conducted from May '90 to April '91. Water samples from three depth i.e. surface, mid and bottom (up to 18m) were taken from five sampling stations (Rangamati, Balukhali, S11balong, Kaptai and Naniarchar) fortnightly using a Kemmerer water sampler between 9 and 10 am. Rainfall and water level data were recorded from the Power Development Board (PDB), Kaptai. Air and water temperatures were measured with a centigrade thermometer. Visibility was determined with a standard Secchidisc. pH-value was determined calorimetrically by means of Lovibond comparator. Conductivity meter (HANNA HI-8033, England) was used to measure specific conductance. Dissolved oxygen was estimated by the azide modification of the Winkler metho. firee carbondioxide content was determined by phenolphthalein indicator method. Total alkalinity was estimated by using phenolphthalein and methyl orc,nge indicator methoci. Total hardness was determined by EDTA titrimetric method. HACH test kit (Model-FF-1A, USA) was used to measure ammonium nitrogen and chloride ion only.

Source of Information: Bangladesh J. Fish. Res., 3(1): 33-39, 1999

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

In Kaptai lake Vertical variation in temperature (0.8-4.7°C) was observed in all months.
The water level fluctuate appreciably throughout the year.
Wide seasonal fluctuations were also noted in water transparency.
The lake was found to be slightly hard and alkaline pH. Dissolved oxygen (DO) (6.4-9.1 mg/l) and free carbondioxide (4.7- 6.0 mg/l) contents showed favorable condition for aquatic lives.
DO at different depth showed no wide variation (1.0-2.4 mg/l).
Conductivity ranged between 91.9± 7.1 and 106.4 ±5.2 mS/cm.

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