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Qualitative and Quantitative Variation in Plankton Communities Between Mono and Polyculture Systems in Khulna, Bangladesh

Sarower
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh

Md. Ashkar Bin Sayeed
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh

Wasim Sabbir
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh

Abstract/ Executive Summary:

Plankton population of shrimp and shrimp-GIFT (Genetically Improved Farmed Tilapia) culture ponds were studied. The present study was carried out to estimate phytoplankton and zooplankton abundance and diversity in mono and polyculture systems. A total of 13 phytoplankton genera of cyanophyceae, chlorophyceae, bacillariophyceae, euglenophyceae, rhodophyceae and dinophyceae were recorded from the monoculture ponds while 12 phytoplankton genera were measured from shrimp-tilapia mixed culture ponds. Six genera of zooplankton under copepod, rotifer, cladocera, ostracoda were identified in monoculture system and 7 genera were found from polyculture ponds. The numbers of phytoplankton and zooplankton species were recorded to be significantly (p<0.05) higher in monoculture, compared to the polyculture system. In both culture systems, cyanophyceae of phytoplankton and copepod of zooplankton were the dominant groups.

Keywords: Phytoplankton, Zooplankton, Shrimp culture, Shrimp-tilapia mixed culture, Bangladesh.

Location: Bangladesh Fisheries Research Institute at Paikgacha thana in Khulna, Bangladesh

Start Date: 00-06-2007

End Date:

Program Area: Animal Health and Management

Commodity: Plankton

Objectives:

Islam and Aziz (1975) and Ganapati (1943) studied the seasonal variation of plankton; Martínez-Córdova and Peña-Messina (2005) studied the abundance of zooplankton in semi-intensive mono and polyculture systems, and Chowdhury and Mamun (2006) studied the abundance and diversity of plankton in fish pond. But the information about plankton abundance and diversity in relation to fish culture systems and management is poor. Therefore, the present study was conducted to know the qualitative and quantitative abundance of phyto and zooplankton populations in shrimp monoculture and shrimp-GIFT mixed culture ponds.

Methodology:

Four ponds of 0.2 hectare (ha.) with 2-2.5 m depth were selected from Bangladesh Fisheries Research Institute at Paikgacha thana in Khulna, Bangladesh. The ponds were connected with a river allowing entrance to coastal water into the pond. For monoculture of shrimp Pond 1 (P1) and Pond 2 (P2), and for polyculture with shrimp and GIFT tilapia (a Nile tilapia strain belongs to the genus, Oreochromis), Pond 3 (P3) and Pond 4 (P4) were selected. Sampling was carried out during the month of June, 2007. Plankton samples were collected from each pond by conical shaped monofilament nylon net of 10µm mesh size. Collected plankton samples with water were kept in plastic containers, and carried to the Water Quality Laboratory of Fisheries and Marine Resource Technology Discipline, Khulna University for further analyses. Plankton net of 200 µm was used to get zooplankton separated from the plankton samples. About 250 ml samples of zooplankton were preserved with 1.5 ml Borax buffered formalin (5%) and phytoplankton samples with 1.5 ml Lugol’s solution. Planktons were enumerated under a light microscope by using Sedgwick-Rafter counting cell (Welch, 1948). Identification was done by following the literatures of Moniruzzaman (1997); Zheng (1984) and Davis (1956). Water temperature, pH, salinity, and transparency were measured by mercury thermometer, pH meter, refractomete and secchi disc, respectively. Dissolved oxygen content in water was measured by titrimetric method (Welch, 1948). Data were analysed using Microsoft Excel and SPSS.

Source of Information: Khulna University Studies, 9(1): 111-116, 2008

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The present study reveals that the quantitative and qualitative abundance of plankton population could vary with culture systems. The abundance of phyto and zooplankton was higher in shrimp monoculture ponds than in shrimp-tilapia polyculture ponds. The findings of the present work might provide baseline information for further research on species selection, and food and feeding strategies for fish culture systems.

Knowledge Management: Journal