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Study on the Zooplankton of Sona Dighi in Rajshahi, Bangladesh

Sabrina Naz
Department of Botany, University of Rajshahi, Rajshahi

Sirajun Najia
Department of Botany, University of Rajshahi, Rajshahi

Abstract/ Executive Summary:

Zooplankton populations of Sona Dighi were remarkable. In all 31 genera and 45 species represented by five major groups have been reported from Sona Dighi, Rajshahi based on a year investigation. The recorded groups were as follows as Protozoa (5 genera, 4 species), Rotifera (7 genera, 11 species), Cladocera (6 genera, 8 species), Ostracoda (4 genera, 6 species) and Copepoda (9 genera, 15 species).Physical chemical characteristics and zooplankton diversity of the reservoir indicates its eutrophic nature.

Keywords: Zooplankton,Sona Dighi,Rajshahi,Bangladesh.

Location: Rajshahi

Start Date:

End Date:

Program Area: Animal Health and Management

Commodity:

Objectives:

The present communication deals with systematic description of zooplankton population of the reservoir named Sonadighi. During the study major limnological conditions were also taken under consideration.

Methodology:

Sona Dighi is situated in the central region of Rajshahi city. It is more or less rectangular in shape. The reservoir has a water span of 3633m²with a depth varying from 3.66 m to 4.88m at mid region. Almost in all the sides brick- build embankment were present about 1 meter high from the water surface. There was no macro vegetation in the littoral zone and surface area of the reservoir. Monthly sampling was carried out for a year, three representative samples were collected from three selected sites of the water body. Samples were collected from below the surface using plankton net No: 20 silk bolting cloth (mesh size 0.076mm) and preserved in Transeau’s solution (Transeau , 1951). The figures of individual zooplankter were drawn by camera lucida at the time of microscopic examination. Zooplankton were identified up to species level by following relevant literatures. Water samples were collected on the same day from 20cm below the surface to estimate the physical chemical condition of reservoir. The water samples were treated for physical chemical studies with the help of digital thermometer for temperature, Seccchi disk for transparency, with graduated rope with weight in one end for depth, digital pH meter (HANNA)for pH, free carbon di oxide (CO₂), carbonate, bicarbonate (HCO₃), dissolved oxygen (DO), biochemical oxygen demand, chemical oxygen demand (COD), nitrate nitrogen (NO₃-N), calcium (Ca), magnesium (Mg) content and total hardness (T-H) were determined following Ambast (1990), APHA (1975), Welch (1948), APHA (1975), Sharup et al. (1992), Mishra and Saksena (1992).Oxidation reduction index (rH₂),oxidation reduction potential (Eh) were determined following Gautam (1990).

Source of Information: Univ. j. zool. Rajshahi Univ. Vol. 27, 2008 pp. 07-11 ISSN 1023-6104

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The zooplankton occupy an intermediatory position between the autotrophs and the carnivores and form an important link in aquatic food webs. The zooplankton population of the concerned habitat was found to be dominated by copepods both in number and diversity followed by rotifers. The abundance of some zooplankton in the aquatic food web is reported to indicate eutrophication. Among these members of copepods and rotifers are considered which corroborates with the present findings. Apart this the chemical and redox features of the habitat indicates its eutrophic and presence of high organic load.

Knowledge Management: Journal