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Monsoonal Plankton Distribution and Physico-chemical Water Qualities in a Rain-fed Lake in Noakhali, Bangladesh

NAJMUS SAKIB KHAN
Corresponding author:
Department of Oceanography, Noakhali Science & Technology University, Noakhali 3814, Bangladesh

MD SAIFUL ISLAM
Department of Oceanography, Noakhali Science & Technology University, Noakhali 3814, Bangladesh

JABER BIN ABDUL BARI
Department of Oceanography, Noakhali Science & Technology University, Noakhali 3814, Bangladesh

MD MOSTOFA KAMAL
Department of Oceanography, Noakhali Science & Technology University, Noakhali 3814, Bangladesh

Abstract/ Executive Summary:

The study focused on the monsoonal distribution of plankton in a rain fed partial lake in Sonapur, Noakhali district, Bangladesh. Three sampling sites were chosen between Sonapur zero point and Noakhali Science and Technology University. Four groups of phytoplankton such as Chlorophyceae (11 genera), Bacillariophyceae (6 genera), Cyanophyceae (6 genera) and Euglenophyceae (3 genera) and four groups of zooplankton such as Rotifera (10 genera), Cladocera (3 genera), Copepoda (2 genera) and Crustacea (2 genera) were identified. The lake was found to be organic polluted (Palmer’s algal pollution index value: 22.33). The average wet land zooplankton index (WZI) value of this lake was estimated 3.72 means moderate water quality. During the sampling periods some important Physico-chemical parameters like temperature (29-30 ?C), pH (7.8-8.2), transparency (6.5-13.50 cm), free CO2 (8.00-12.00 mg/l), total alkalinity (13.00-14.50 mg/l), ammonia (0.1-0.5 mg/l), nitrate (0.05-0.25 mg/l), nitrite (0.03-0.07), phosphate (0.1-0.9 mg/l), dissolved oxygen (2-3.5 mg/l) and total suspended solids (4.0×10-4-5.3×10-4 mg/l) were also determined as supporting water quality statements.

Keywords: Rain fed lake, Palmer’s algal pollution index, Wet land zooplankton index

Location: Sonapur Lake, Noakhali district, Bangladesh

Start Date: 00-06-2018

End Date: 00-09-2018

Program Area: Conservation and Biodiversity

Commodity: Plankton, Water quality, Rain water

Objectives:

To identify plankton and estimate the pollution level in water by employing algal and zooplankton index.

Methodology:

A total of three sites in Sonapur Lake, Noakhali district, Bangladesh were selected for phytoplankton zooplankton sampling and estimation of water quality. This study was conducted from June 2018 to September 2018. This study aimed to analyze physicochemical parameters (water temperature, total alkalinity, total suspended solids, free CO2, ammonia, nitrate, nitrite, phosphorus and dissolved oxygen) in Sonapur Lake. The water temperature, pH and water transparency were measured directly on spot by the thermometer, pH meter (HANNA-HI96107) and secchi disc respectively. In conducting study total alkalinity (mg/l), total suspended solids (mg/l), free CO2 (mg/l), ammonia (mg/l), nitrate (mg/l), nitrite (mg/l), phosphorus (mg/l) and dissolved oxygen (mg/l) were determined according to guidelines from the American Public Health Association (APHA et al. 1995). Plankton samples were collected from surface water through plankton net (mesh size: 30 µm) and preserved in 150 ml plastic container with 7% formalin. Plankton were observed at 16×10 and 16×40 magnification using a light microscope in sedge wick-R after counting cell. The density and diversity of plankton were identified by following Van Vuuren et al. (2006).

Source of Information: Bangladesh J. Fish. (2020) 32(1) (Supplement) : 179-184

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The plankton assemblages introduce the fertility of lakes. Now a days maximum lakes are not properly treated and faced poor management in Bangladesh. However, lakes can be one the most productive aquatic body by expanding fisheries and the recreational economy. Therefore, this study aimed to determine Sonapur Lake water quality through estimating phytoplankton and zooplankton distribution. The plankton assemblage is one of the most important requirements for fisheries production.

Knowledge Management: Journal