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Abundance of Zooplankton and Physico-chemical Parameters of a Polyculture Fish Pond of Manikganj, Bangladesh

Pronob Kumar Mozumder
Department of Zoology, University of Dhaka, Dhaka-1000, Bangladesh

Abu Tweb Abu Ahmed
Department of Zoology, University of Dhaka, Dhaka-1000, Bangladesh

M. Niamul Naser
Department of Zoology, University of Dhaka, Dhaka-1000, Bangladesh

Abstract/ Executive Summary:

Composition and abundance of zooplankton in a polyculture pond was studied during June 2003 to May 2004. A total of 33 major species of zooplankton including 11 genera of Rotifera, 4 of Copepoda, 4 genera of Cladocera and 2 genera of Protozoa were identified. The monthly abundance of zooplankton varied form 4228 indiv/l in October 2003 to169 indiv/l in January 2004. Among the total zooplankton, Rotifera comprised of 71.07%, Copepoda comprised of 12.49% Nauplii comprised of 11.96%, Cladocera comprised of 1.49% and Protozoa comprised of 2.99%. Water temperature (r = 0.18), free CO₂ (r = 0.40), TDS (r = 0.14) and water depth (r = 0.55) showed positive correlation with zooplankton but air temperature, pH, dissolved O2, total hardness and ammonia showed negative correlation (the coefficients being -0.18, -0.05, -0.25, -0.38 and -0.11 respectively) with the occurrence of zooplankton. The average growth of fishes and zooplankton showed positive correlation in all cases but the relations were insignificant when tested statistically.

Keywords: Zooplankton, Physico-chemical factors, Polyculture, Abundance.

Location: Fish hatchery and nursery complex called “Jahan-E-Nizam Bahumukhi Krishi Khamar"in Manikgonj district

Start Date: 00-06-2003

End Date: 00-04-2004

Program Area: Animal Health and Management

Commodity: Plankton

Objectives:

The present investigation was an attempt to examine the influence of physico-chemical factors on abundance, monthly diversity and composition of zooplankton and their relation on fish growth in a semi-intensive polyculture fish pond of Manikgonj, Bangladesh.

Methodology:

The present study was carried out on fresh water pond at a private fish hatchery and nursery complex called “Jahan-E-Nizam Bahumukhi Krishi Khamar"in Manikgonj district from June 2003 to May 2004.The area is rectangular in shape, water surface area is 66 decimal (2672 cubic meter) and average depth of the pond varied from 2.75 to 3.65 m. The pond bottom was muddy and no macro vegetation was evident. Water supply was dependent on rainfall and pumped water supply. During the study nursery pond was converted into rearing pond. The monthly physico-chemical factors of the water were determined in the pond. The pH and dissolved oxygen (DO) were determined by digital pH meter (HANNA, China) and digital oxygen meter (HANNA, China) respectively. Free carbon dioxide (CO₂), hardness, ammonia, nitrite were determined by using HACH kit box (FF2, USA). A digital TDS (HANNA, China) was used to determine the transparency of water. At the time of sampling air and water temperature were recorded by a digital temperature meter (Fisher, U.S.A.). The water samples for biological studies were taken from four different places of the pond from the surface and middle level of water in a plastic bucket on monthly basis. Water was collected with a 10 liter plastic bucket. First the water (30 liters) was sieved through plankton net (64 mesh/m^-2). The concentrated plankton was adjusted to 18 ml and preserved immediately in 4% buffered formalin solution. For qualitative and quantitative study, zooplankton samples were examined under a compound microscope in a S-R (Sedgeweak-Rafter) cell using 100x magnification. The identification of zooplankton up to generic /species level were done with the help of Ward and Whipple(1959), Tonapi (1960), Mellanby (1975), Ali and Chakrabarty (1992) and Bhouyain and Asmat (1992). Quantitative analysis was followed by the total count method of Welch (1948). Statistical analysis: The relationships between zooplankton and physicochemical factors and average fish growth were established by correlations using Excel software of Microsoft office 2003.

Source of Information: Bangladesh J. Zool. 42(1): 67-76, 2014

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The results revealed that the zooplankton abundance in fish culture pond varied from month to month. Among zooplankton groups, Rotifera appeared to be most dominating community throughout the study period.

Knowledge Management: Journal