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Study on the Diversity and Seasonal Variation of Zooplankton in a Brood Pond, Bangladesh

UZZAL ROY
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna

BIPLAB KUMAR SHAHA
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna

KH. MAZHABUDDIN
Padakhap-Manobik Unnayan Kandro

MD. FAZLUL HAQUE
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna

MD. GOLAM SAROWER
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna

Abstract/ Executive Summary:

The present study was designed to estimate zooplankton abundance qualitatively and quantitatively in carp brood fish culture systems. Plankton samples were collected from Gallamari fisheries extension & training centre farm, Batiaghata, Khulna, one time in a month. A total 6 groups of zooplankton were found from the study ponds. The identified zooplanktons were under six orders namely copepoda, rotifera, cladocera, ostracoda, crustacean larvae and bryozoa. Numbers of zooplankton groups were recorded to be the highest in December. In the brood pond copepod was the dominant order. Among various orders of zooplankton, the percentages of copepoda, rotifera, cladocera, ostracoda and crustacean larvae brysozoa in brood fish culture system were 55%, 8%, 25%, 9%, 2% and 1% respectively. Copepoda was dominant in May, June, July, August, October, November and December but cladocera was dominant in September. Insect larvae were dominant in all month of study period. Bryozoa was found only in December. Five physico-chemical parameters were also studied during study period namely, water temperature, salinity, transparency, dissolve oxygen and pH. The relationship of zooplankton with physico-chemical parameters were also measured to observed variation of zooplankton monthly. The findings of the present study will help to improve the management strategies of the brood culture pond.

Keywords: Zooplankton, Brood pond, Seasonal variation

Location: Gallamari fisheries extension & training centre farm, Batiaghata, Khulna

Start Date: 00-00-2008

End Date: 00-00-2008

Program Area: Conservation and Biodiversity

Commodity: Plankton

Objectives:

To estimate zooplankton abundance qualitatively and quantitatively in carp brood fish culture systems.

Methodology:

Area of sampling: The pond under study has been selected from Gallamari fisheries extension & training centre farm, Batiaghata, Khulna. It is near Khulna University, beside Khulna-Satkhira high way road. The fish farm brood pond has an area of 75 decimals. The average depth of the fish culture pond was 1.5 meter. During the study period there were no aquatic plants in this spot and it receives direct sunlight. There are silver, rui, mrigal, catla, and grass carp in the brood pond. Various artificial feed are used for 172 piece of silver carp, 220 pieces of rui, 200 pieces of mrigal, 55 pieces of catla and 12 pieces of grass carp. Sampling period: Once in 2nd week of every month around 9.00 a.m. Sampling was started May to December. Sample size: Zooplankton samples were collected from three parts of a brood pond using by simple conical tow-net oblique or horizontal tows which mesh size is 90μm and the diameter of the net at mouth was 30 cm. Sample size was varied with water depth because the net was dragged vertically. By using depth of water and conical tow-net diameter, the sample size was calculated. Sample collection: Sampling of zooplankton has been conducted by zooplankton net mesh size 90μ considering triangular points of varsity lake. The samples were kept in the plastic container and carried out to the Water Quality Laboratory and Biology Laboratory of FMRT Discipline for further analyses. Identification and calculation: Sample water has been mixed with 1.5 ml Lucas reagent and kept in 100ml in a biker. Then it is poured on S-R (sedgwick rafter) cell. Then it has been set up with microscope to identify different species of zooplankton. Thus, a series of pencil and ink drawing on postcards of the species of the observed were prepared to identify the organisms. Counting: For plankton counting, the Sedgwick-Rafter (S-R) cell was used which is 50 mm long, 20 mm wide and 1mm deep. Before filling the S-R cell with sample, the cover glasses were diagonally placed across the cell and then samples were transferred with a large bore pipette so that no air bubbles in the cell covers were formed. The S-R cell was let standard for at least 15 minute to settle plankton. Then plankton on the bottom of the S-R cell was counted enumerated by compound microscope. By moving the mechanical stage, the entire bottom of the slide area was examined carefully. Organisms lying between two parallel cross hairs were counted. Physico-chemical parameters: At first sample is taken from the selected pond and measured various types of physico-chemical such as temperature, turbidity and pH, DO, hardness etc. Water temperature was measured at each station using a mercury thermometer of 0 to 50 degree centigrade range. Surface water was taken in a plastic container and recorded its temperature immediately by dipping the thermometer for about one minute. Water PH was measured by a bench top electrometric pH meter. Transparency of water was measured by using secchi disc. The sample was taken from three different corners of the pond. For DO measurement sample was fixed up by using alkaline iodide and manganous sulfate then after few times concentrated H₂SO₄ was added into the BOD bottle. For another measurement (hardness, alkalinity, free CO₂) different plastic bottle was used to collect the sample. The parameters (DO, hardness, free CO₂, alkalinity) was measured by using relevant equipments and chemicals in the laboratory. Different titrimatric method was applied to experiment those parameters. For alkalinity, 2 drops methyl orange indicator was added into 10 ml of the sample and H₂SO₄ solution was taken in the burette. In the titration of alkalinity, light pink color was observed at the end point. 0.1N NaOH was taken in the burette and phenolphthalein indicator (5 drops) was added to the solution. Permanent pink color was observed at the end point. Two drops starch solution was added to the fixed up sample (20 ml) and Na₂S₂O₃ was taken in burette. The titration was continued to first disappearance of blue color. In hardness measurement standard EDTA solution was taken into burette and 1 ml buffer solution and 2 drops black-T solution was added into 50ml of the sample. At the end point of titration the solution was observed normally blue color. Three times experiment was done for each parameter to determine the average result.

Source of Information: Marine. res. aqua. 1(1):30-37 (January 2010) ISSN 2076-3913

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From the observation it is found that the zooplankton abundance has been varied from place to place and it showed direct or indirect relationships with the physico-chemical parameters. These finding will be helpful for the future observation and field work on zooplankton population.

Knowledge Management: Journal