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A Study on Limnological Aspects of Ramsagar Lake in Dinajpur District

Z. Ferdoushi
Department of Fisheries Management, Hajee Mohammad Danesh Science and Technology University, Dinajpur

R. H. Chowdhury
Department of Fisheries Management, Hajee Mohammad Danesh Science and Technology University, Dinajpur

K. Fatema
Department of Fisheries Management, Hajee Mohammad Danesh Science and Technology University, Dinajpur

A. Islam
Department of Fisheries Management, Hajee Mohammad Danesh Science and Technology University, Dinajpur

Abstract/ Executive Summary:

Limnological aspects of the Ramsagar lake, a manmade lake of Dinajpur district was studied from January 2013 to August 2013. In this experiment, five sampling points inside the Ramsagar lake were selected and water quality parameters were analyzed fortnightly. Among different physico-chemical parameters, water temperature, dissolved oxygen, total alkalinity, total hardness, phosphate-phosphorus and concentration of Chlorophyll-a did not differ significantly except the water level and pH. A total of 29 species of plankton were recorded where phytoplankton comprised of 21 species and zooplankton comprised of 8 species. Chlorophyceae was found dominant throughout the study period followed by Bacillariophyceae, Cyanophyceae and Euglenophyceae. The highest plankton cell density was observed in the month of July and lowest plankton density was observed

Keywords:

Location: Dinajpur

Start Date: 00-01-2013

End Date: 00-08-2013

Program Area: Resource Development and Management

Commodity: Aquatic animal

Objectives:

To find out the limnological status of Ramsagar lake for evaluating the potential risk of water quality deterioration of this economically important aquatic resources.

Methodology:

The present study was done in Ramsagar lake of Dinajpur district, Bangladesh. The lake is around 1.03 km long and 0.36 km wide and is located on a 60 hectare elevated land which is about 8 km south of Dinajpur city. The main construction of Ramsagar lake was initiated by king Ram Nath between 1750 and 1755 AD. The area of the water body is 31.53 hectare which is surrounded by red color soil. Initially the reservoir was made to provide safe drinking water to local inhabitant. Now, the waterbody is playing significant recreational role in tourism. Presently the lake is taken care by the department of fisheries (DoF) (Khondker et al. 2012) and the catchment is occupied by secondary forests and managed by the forest department of Bangladesh. For the purpose of the study, five different sampling points were selected (P₁, P₂_, P₃, P₄ and P₅). Samplings were done fortnightly for a period of 8 months from January to August 2013. The water samples were collected from five different points in the morning hours between 8.0 am to 11.0 am. Plastic bottles with stopper having a volume of 250 ml each and marked with different point number and sampling date were used for collection of water samples. A digital thermometer was used for water temperature measurement. Transparency was measured with a secchi disc of 20 cm diameter. Dissolved oxygen of water samples were calculated by portable digital DO meter (Lutron, DO-5509). For observing the pH of water samples a direct reading digital pH meter (CORNING pH meter 445) was used. While other parameters such as alkalinity, hardness, phosphate and Chlorophyll-a were estimated in the laboratory of department of Fisheries Management by using standard methods as prescribed by APHA (1992) and HACH kit. Plankton samples were collected from the each point in the Ramsagar by using plankton net (mesh size, 0.04 mm). Five liters of water were passed through the plankton net to get a 50 ml sample. The sample was preserved immediately with 10% buffered formalin in a bottle. Sedgewick-Rafter (S-R cell) was used to count plankton with magnification of 10 x 0.25 under the binocular microscope. Taxa of plankton were identified to genus level using keys from APHA (1992). Then plankton abundance was calculated using the formula by Rahman, 1992. An analysis of variance (One Way ANOVA) and Tukey’s test was applied to data for determining significance and comparison between means ± SD (standard deviation). The statistical analysis were calculated by using SPSS.

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