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Seasonal Variation of Plankton Population of Borobila Beel in Rangpur District

M.M.R.Chowdhury
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh

M.R.K.Mondol
Department of Fisheries, University of Rajshahi, Rajshahi

C. Sarker
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh

Abstract/ Executive Summary:

Seasonal variation of the plankton populations with some water quality parameters of Borobila beel, Rangpur district was carried out during July 2003 to June 2004. Total plankton ranged from 98.3×104 to 35.0×105 cells/l with mean values of 19.67±9.77×105 cells/l. A total of 51 genera of planktons were recorded belonging to Chlorophyceae, Bacillariophyceae, Cyanophyceae, Euglenophyceae, Dinophyceae, Crustacea and Rotifera. Among the phytoplankton, Euglenophyceae was the most dominant group and contributing 33% of total phytoplankton in Borobila beel. The greatest abundance of phytoplankton was recorded in November with an average number 28.83×105 cells/l. The minimum abundance of phytoplankton was recorded in January (61.7×104 cells/l). Among the zooplanktons Crustacea was dominant, contributing 71% of the total zooplankton population. The abundance of zooplankton showed two peaks of which one in the month of August (81.7x 104 cells/l) and another in the month of May (16.7 x104 cells/l). Phytoplankton and zooplankton have a nominal positive relationship. Zooplankton was less increased with the increasing of phytoplankton.

Keywords: Water quality parameters, plankton population, Borobila beel.

Location: Rangpur

Start Date: 01-07-2003

End Date: 31-07-2004

Program Area: Resource Development and Management

Commodity: Plankton

Objectives:

The present study was undertaken to study monthly variation of plankton population with some water quality parameters and to find out the scope of aquaculture in this beel, Rangpur

Methodology:

Plankton and water samples were collected monthly from July 2003 to June 2004 from six different sites of the beel. Samplings were made between 9.00 to 11.30 am. Ten liters of water were collected from each site by a plastic bucket and kept on wooden boat. Water temperature, pH and conductivity were measured directly from the collected water using a digital water proof pH, EC/TDS and temperature meters (HANNA instruments, model: HI 98129- HI 98130). Hundred ml sample of the collected water of each site were taken in a bottle and NO₃-N were measured directly from the reading of spectrophotometer HACH water analysis Kit (HANNA instrument, model HI 93728) with one packet of HI 93728 reagent for 10 ml filtered water samples. The concentration of PO₄-P was measured directly from the reading of spectrophotometer HACH water analysis Kit (HANNA instrument, model HI 93713) with one packet of HI 93713 reagent for 10 ml filtered water samples. For study of plankton, the collected 10 L water was filtered through plankton net of 10, 30 and 55 μ mesh and finally concentrated to 20 ml. The filtrates were then immediately preserved in 5% buffered formalin for further studies. Microscopic identification up to genera level was performed following the standard manual. Each sample was stirred well just before microscopic examination. One ml of stirred sample was transferred to Sedgewick-Rafter (S-R cell) cell with a wide mouth pipette. Identification and enumeration were done by a compound electrical microscope (NOVA 950 ES). All the planktons present in 20 squares of the cell chosen randomly were counted. The mean of three estimates was then calculated for each component occurring in the total count. Finally the quantitative counts of phytoplankton were done according to Rahman (1992) and expressed in cells/l. Qualitative studies were done after Peenak (1953), Ward and Whipple (1954), Needham and Needham (1962), Prescott (1964), Bellinger (1992) and APHA (1992).

Source of Information: Univ. j. zool. Rajshahi Univ. Vol. 26, 2007. pp. 49-54 ISSN 1023-6104

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

In the present study, the range of total zooplankton populations was from 16.7× 103 to 81.7× 104 cells/l, with mean value of 46.3±21.5×104 cells/l. Crustacea was dominant group and Rotifera was the rarest among zooplankton. Zooplankton showed two peaks, one in the month of August to October and another in the month of May. Both phytoplankton and zooplankton showed direct relationship between themselves. Among the vast inland fishery resources, beels are more potential. But fish production from beel fishery is decreasing day by day due to various man made activities. So, beel fishery should be preserved for augmenting fish production and ecological balance of this habitat. Therefore, restoration and development of degraded habitats and rehabilitation of depleted stocks by ranching programme are urgently needed. From the present study, it is suggested that further study on seasonal changes of phytoplankton in relation to some water quality parameters should be under taken in different sites of Borobila beel.

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