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Abundance of Plankton Population Densities in Relation to Bottom Soil Textural Types in Aquaculture Ponds

F. Siddika
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M. Shahjahan
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M.S. Rahman
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

Plankton is an important food item of fishes and indicator for the productivity of a water body. The present study was conducted to evaluate the effects of bottom soil textural conditions on abundance of plankton in aquaculture pond. The experiment was carried out using three treatments, i.e., ponds bottom with sandy loam (T₁), with loam (T₂) and with clay loam (T₃). The ranges of water quality parameters analyzed were suitable for the growth of plankton during the experimental period. Similarly, chemical properties of soil were also within suitable ranges and every parameter showed higher ranges in T₂. A total 20 genera of phytoplankton were recorded belonged to Chlorophyceae (7), Cyanophyceae (5), Bacillariophyceae (5), Euglenophyceae (2) and Dinophyceae (1). On the other hand, total 13 genera of zooplankton were recorded belonged to Crustacea (7) and Rotifera (6). The highest ranges of phytoplankton and zooplankton densities were found in T₂ where low to mediumtype bloom was observed during the study period. Consequently, the mean abundance of plankton (phytoplankton and zooplankton) density was significantly highest in T₂. The highest abundance of plankton in the T₂ indicated that pond bottom with loamy soil is suitable for the growth and production of plankton in aquaculture ponds.

Keywords: Phytoplankton, Zooplankton, Aquaculture, Soil Textural Classes, Water Quality

Location: Bangladesh Agricultural University, Mymensingh

Start Date: 00-08-2011

End Date: 00-11-2011

Program Area: Resource Development and Management

Commodity: Plankton

Objectives:

To evaluate the effects of bottom soil textural conditions on abundance of plankton in aquaculture ponds.

Methodology:

The experiment was conducted in the ponds situated at the campus of Bangladesh Agricultural University, Mymensingh during August to November 2011. The experiment had three treatments with three replications, i.e., ponds bottom with sandy loam (T₁), with loam (T₂) and with clay loam (T₃). The average depth of the experimental ponds was 106.68 cm.Various physical and chemical water quality parameters of the ponds such as water temperature (°C), transparency (cm), dissolved oxygen (mg L^-1), pH, free CO₂ (mg L^-1), total alkalinity (mg L^-1), PO₄-P (mg L^-1) and NO₃-N (mg L^-1) were estimated fortnightly following the standard method.Various chemical parameters of the ponds bottom soil (sediment) such as pH, available phosphorus (ppm), total nitrogen (%), organic carbon (%) and organic matter (%) were estimated fortnightly using standard method. Study of plankton Plankton population of ponds water such as phytoplankton density (cells L^-1) and zooplankton density (cells L^-1) were estimated fortnightly. The counting of plankton (both phytoplankton and zooplankton) was done with the help of Sedgwick- Rafter Counting Cell (S-R cell) under a compound binocular microscope. The plankton population was determined. Identification of plankton (phytoplankton and zooplankton) up to generic level were made.Values are expressed as means ± standard error of the mean (SEM). Data were analyzed by oneway analysis of variance (ANOVA) followed by Tukey’s post hoc test to assess statistically significant differences among the different sampling days and different treatments. Statistical significance was set at P < 0.05. Statistical analyses were performed using SPSS Version 14.0 for Windows (SPSS Inc., Chicago, IL).

Source of Information: ISSN: 2224-0616 Int. J. Agril. Res. Innov. & Tech. 2 (1): 56-61, June, 2012 Available online at http://www.ijarit.webs.com

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Suitability of bottom soil textural conditions on abundance of plankton population density was analyzed in aquaculture ponds. Most of the water quality parameters of the ponds were more or less similar and within productive limit, and chemical properties of soil were also within suitable ranges. The mean abundance of plankton density was significantly highest in T₂ indicated that loamy soil bottom is suitable for the growth and production of plankton in aquaculture ponds.

Knowledge Management: Journal