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Limnological Study of Shuksagaor Lake in Dinajpur District

ZANNATUL FERDOUSHI
Department of Fisheries Management, Faculty of Fisheries, Hajee Mohammad Danesh Science and Technology University, Dinajpur

RAFAT HOSSAIN
Department of Fisheries Management, Faculty of Fisheries, Hajee Mohammad Danesh Science and Technology University, Dinajpur

MOST. JANNATUN NAHER
Department of Fisheries Management, Faculty of Fisheries, Hajee Mohammad Danesh Science and Technology University, Dinajpur

OMAR HASSAN
Department of Fisheries Management, Faculty of Fisheries, Hajee Mohammad Danesh Science and Technology University, Dinajpur

YEASIR ARAFAT
Department of Fisheries Management, Faculty of Fisheries, Hajee Mohammad Danesh Science and Technology University, Dinajpur

Abstract/ Executive Summary:

Shuksagar, a manmade lake and famous eco-park of Dinajpur district was studied from February to July 2018 in order to observe the present condition of physico-chemical water quality parametersas well as the abundance of planktonic community. Three sites inside the lake were selected for research purpose. Water samples were collected fortnightly from the selected sites and analyzed. Most of the parameters of water were found in suitable ranges. The observed ranged of water temperature of Suksagar reservoir was within the productive range (16° to 32°C). The average (±SD) values of transparency were 29.97±5.17, 30.20±4.99 and 30.53±4.82 cm in three sites. The highest water temperature (35.50C) was recorded in the month of July while the lowest temperature was found 19⁰C in February.The alkalinity ranged from 58 to 124 mg/l during the study period. While the maximum (10.60 mg/l) and minimum (4.8 mg/l) dissolved oxygen concentration occurred in site 1 during the month of April and February. The highest pH value was found as 10.70 at site 3 during the month of February and the lowest (5.5) at site 2 during the month of May. Twenty two phytoplankton species and 8 zooplankton species were detected in the lake. Total phytoplankton abundance was found higher (25.90×103cell/l) in the month of February, whereas the minimum value was observed (5.07×103cell/l) during April.Chlorophyceae was found to be dominant throughout the study period followed by Bacillariophyceae, Cyanophyceae and Euglenophyceae. The relative abundance of different planktonic groups and other limnological condition indicate that the Shuksagarreservoir is suitable for fish culture and for the survival of other aquatic life.

Keywords: Shuksagar reservoir, Physico-chemical, Phytoplankton, Zooplankton

Location: Rajbati in Dinajpur district, Bangladesh

Start Date: 00-02-2018

End Date: 00-07-2018

Program Area: Conservation and Biodiversity

Commodity: Fish

Objectives:

To observe the physicochemical and biological characteristics of water of Lake Shuksagarto understand the functional aspects of this recreational lake and to suggest ways and means for its conservation.

Methodology:

Shuksagar lake, a rectangular shaped water reservoir with an area and a depth of 98456.25 m2 and 2 m (approximately) was selected for the research. It is located at Rajbati in Dinajpur lying between the latitude of 25°38'N and longitude of 88°39'E. Three sites (S1, S2 and S3) were selected for sampling to get representative data. Samplings were conducted for a period of 6 months from February to July 2018. Sampling: The water quality parameters were recorded fortnightly. Water temperature pH, transparency, DO were recorded in the field sites. For analyzing other water quality parameters such as alkalinity and plankton counting, water samples were brought to the laboratory of the Fisheries Management Department of HSTU, Dinajpur. Plankton samples were collected by filtration technique where ten liters of water samples were filtered through plankton net of 25 μm mesh size and plankton samples were preserved in 4% formalin solution. Study of plankton population: Taxonomic identification up to genus level of plankton was carried out under the binocular microscope with the help of taxonomic keys from the text book of Bellinger (1992), Pontin (1978), Lind and Brook (1980). Then plankton abundance was calculated using the formula by Rahman (1992): N= (A×C) / (FxVxL) x 1000. where, N= No. of plankton cells per liter A= Total no. of plankton counted, C= Volume of final concentrate of samples in ml, V= Volume of a field in cubic millimeter, F= Number of the fields counted, L= Volume of original water in liter, Taxa of plankton were identified to genus level using keys from APHA (1992) with a magnification of 10 × 0.25 under the binocular microscope. Statistical Analysis: The comparison between means ± SD (standard deviation) was tested for significance by using one-way ANOVA analysis and Tukey’s test. The statistical analyses were calculated, using SPSS 15.

Source of Information: Bangladesh J. Fish. (2019) 31(1) : 101-109

Article Link (Online Journal):

Funding Source:

1.

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The fortnightly variations of different Physico-chemical parameters at different sites are shown. The maximum air temperature was 32.5⁰C in July while the minimum was 160C in February. Similarly the highest water temperature (35.5⁰C) was recorded in the month of July at site 3 while the lowest temperature was found at 19⁰C during February at site 1. Among different parameters, only water level was found to vary significantly with the sites. The mean (±SD) values of transparency were 29.97±5.17, 30.20±4.99 and 30.53±4.82 cm at site 1, site 2 and site 3 respectively. The highest transparency observed was 44.50 cm at site 3 during the month of February. In the contrary, the lowest transparency was recorded 22.50 cm at site 1 in the month of May. The highest and lowest water level was observed at site 3 and the lowest was observed at site 1. While the maximum (10.60 mg/L) and minimum (4.8 mg/L) dissolved oxygen concentration occurred at site 1 during the month of April and February respectively. The highest pH value was found as 10.70 at site 3 during the month of February and the lowest (5.5) at site 2 during the month of May. The average values of alkalinity from three study sites were 80.05±14.61, 79.33±15.90 and 74.44±12.32 mg /l, respectively.

Knowledge Management: Journal