Abstract
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.Res. Agric., Livest. Fish.2(2): 319-327, August 2015
Highlights
Kaptai Lake is one of the most important freshwater bodies which are considered as the largest manmade freshwater resource in the South-East Asia including Bangladesh (Halder et al 1991)
The study was conducted in Kaptai Lake the Southeastern Part of Bangladesh from July 2012 to June 2014
Changing trends of physicochemical parameters The data obtained from this study revealed that the physicochemical parameters of the Kaptai Lake are comparatively in well condition but narrow variation existed in total hardness (43.08±5.51 mg/l in 2012-13, 72.16±12.24 mg/l in 2013-14) and total alkalinity (59.45±6.71 mg/l in 2012-13, 74.97±9.69 mg/l in 2013-14) (Table 1 & Fig 1)
Summary
Kaptai Lake is one of the most important freshwater bodies which are considered as the largest manmade freshwater resource in the South-East Asia including Bangladesh (Halder et al 1991). The Kaptai Lake was basically created for hydro-electrical power generation by damming the river Karnaphuli near Kaptai of Rangamati district in 1961. Total surface area of this lake is 68,800 hectare and average water depth is about 9 meters with maximum depth of 32 meters (Halder et al 1991, Alamgir and Ahmed, 2008). The shoreline and basin of this water body are very irregular (Halder et al 1991). This lake was primarily created for power generation, it contributes to produce significant quantity of freshwater fishes, navigation, and flood control. The water of this lakes is been used for many activities namely; households, agriculture, boat repairing and fishing that may result in the pollution of the lake environment
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