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Distribution of Plankton Population in Shrimp Ghers of Bagherhat, Bangladesh

Shahroz Mahean Haque
Department of Fisheries Management, Bangladesh Agricultural University Mymensingh 2202 Bangladesh

Asadur Rahman
Department of Fisheries Management, Bangladesh Agricultural University Mymensingh 2202 Bangladesh

Abstract/ Executive Summary:

Analysis of plankton sample recorded a total of 5 classes phytoplankton viz Bacillariophyceae, Chlorophyceae, Cyanophyceae, Dinophyceae, and Polyhymenophorea. Total 50 phytoplankton species were identified. Among the phytoplankton 18 species belonged to Bacillariophyceae, 12 to Chlorophyceae, 8 to Cyanophyceae, 7 to Dinophyceae, and 5 to Polyhymenophorea. Bacillariophyceae was the dominant group of phytoplankton throughout the study period. Toxin producing dinoflagelates were recorded from the shrimp ghers. A total of 11 kinds of different zooplankton genera were recorded, 4 of which were belonged to Copepoda, 3 to cladocera, 3 to Rotifera and 1 to Decapoda. Copepoda was the dominant group among the zooplankton which was followed by Rotifera and Decapoda. Temperature varied from 27°C to 32°C, transparency 24.5-29.6 cm and pH 6.7 to 9. Salinity fluctuated from 12 to 32.5% in both ghers. P0₄-P and N0₃-N ranged from 0.9 to 4.2 ppm.

Keywords: Phytoplankton, Zooplankton, Water quality, Shrimp gher

Location: Bagerhat district.

Start Date: 00-04-2006

End Date: 00-09-2006

Program Area: Resource Development and Management

Commodity: Plankton

Objectives:

To address the lack of basic information on water quality and plankton population in extensive shrimp gher in Bagherhat.
To detect the beneficial and harmful plankton and thus will also be able to protect the coastal area from inimical affect of harmful planktons.

Methodology:

Study area: The study was carried out in two large shrimp in Gher Bagerhat district, over a period of six months from April 2006 to September 2006. Gher I is situated in the village of Boroipara, and Gher II is situated in the village of Airpara in Fakirhat thana. Analysis of water quality parameters Water quality parameters (temperature, transparency, pH, P0₄-P, N0₃-N, and plankton analysis were determined fortnightly. Water samples were collected from Gher I and Gher II randomly from surface to a depth of 20 cm. between 9-12 A.M. Surface water temperature, transparency and pH were determined using a celsius thermometer, secchi disc and an electronic pH meter Qenway 3020, Germany). Salinity was measured with a hand Refractometer. Nitrate-nitrogen (N0₃-N) and phosphate-phosphorus (P0₄- P) of collected water samples were measured in the using a data logging spectrophotometer (Odyssey 2500, HACH, USA) with high range chemicals (NitraVer 5 Nitrate Reagent Powder Pillows for NOrN, and PhosVer 3 Phosphate Reagent Power Pillows for P0₄-P analysis). Plankton studies: For qualitative and quantitative analysis of plankton, water samples were collected a known volume (20 litres) of sub surface water from different location in each gher. Sample was passed through a plankton net (mesh aperture 25 μ,m). Each concentrated plankton was collected from the bucket (50 ml) and transferred to a plastic bottle and preserved in 5% buffered formalin with distilled water. The quantitative estimation of phytoplankton and zooplankton were done by Sedge-wick-Rafter counting chamber (S-R cell) method in Limnology Laboratory, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh using a microscope. A 1 ml of concentrated sample was put into the S-R cell and left for 10 min to allow the plankton settle. The plankton in 10 randomly selected fields in the cell was identified up to genus level and counted. This procedure was repeated three times for each sample and the mean number of plankton was recorded and expressed numerically per litre of water for each station. Plankton density was calculated. Identification was made down to species level where possible.

Source of Information: Bangladesh J. Fish. Res., 12 (2), 2008: 197-204

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Total 50 phytoplankton species were identified. Among the phytoplankton 18 species belonged to Bacillariophyceae, 12 to Chlorophyceae, 8 to Cyanophyceae, 7 to Dinophyceae, and 5 to Polyhymenophorea. Bacillariophyceae was the dominant group of phytoplankton throughout the study period. Toxin producing dinoflagelates were recorded from the shrimp ghers.

Knowledge Management: Journal