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Diatom in the Fish Pond and Its Dietary Role in Chapila (gudusia Chapra)

M. F. K. Mahmud
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh

S. M. Haque
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh

Abstract/ Executive Summary:

This experiment was conducted to estimate the abundance of diatom (Bacillariophyceae) in the plankton population and the dietary role of diatom in chapila (Gudusia chapra) in the Field Laboratory, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh. A total of 25 genera of phytoplankton belonging to Bacillariophyceae (7), Chlorophyceae (II), Cyanophyceae (5) and Euglenophyceae (2) and 9 genera of zooplankton belonging to Crustacea (3) and Rotifera (6) were recorded from the water. Among the phytoplankton, highest abundance of Chlorophyceae was observed, and Bacillariophyceae, Cyanophyceae and Euglenophyceae ranked the second, third and fourth position in the planktonic population, respectively. Among the zooplankton, Rotifera was recorded as the most dominant group and Crustacea as the least one. From the gut content analysis, 4 groups of phytoplankton consisting of 33 genera of plankton were identified and recorded of which 25 belonging to phytoplankton and 8 belonging to zooplankton. It has been observed that Chlorophyceae and Cyanophyceae were the most dominant food items of chapila. Bacillariophyceae (diatom) and Euglenophyceae were less important and Crustacea and Rotifera were the least important in the diet.ln the gut contents of fish, Chlorophyceae was positively and Bacillariophyceae (diatom) were negatively selected throughout the experimental period also though in the pond water, where the abundance of Bacillariophyceae ranked the second position.

Keywords: Diatom, Food habit, Gudusia Chapra and Plankton

Location: Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh, Bangladesh

Start Date: 00-01-2004

End Date: 00-06-2004

Program Area: Animal Health and Management

Commodity: Fish

Objectives:

To determine the abundance of diatom (Bacillariophyceae) in the plankton population and dietary role of it in chapila ( Gudusi chapra) by calculating the reflectivity index in natural condition

Methodology:

The experiment was conducted in the Field Laboratory, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh, Bangladesh, from January to June 2004.To enumerate plankton population, plankton sample were collected from different place of the experimental ponds by passing 30 liter of water through fine mesh size plankton net and made sample 50 ml., stored in a white plastic bottle with crock untile examine. Buffered formalin was added as a preservative. One ml of concentrated plankton sample was taken by a dropper and then put on the S-R (Sedgewick-Raffer) counting cell. The S-R counting cell was placed under a compound electrical microscope and the plankton was counted. All the plankton present in 10 squares of the cell chosen randomly were counted and used for quantitative estimation following formula described. Twenty fish samples of chapila were collected every month from different places of the experimental ponds. After collection, the fish were preserved in a plastic bottle with 10% formalin to prevent further digestion of food materials and to stop the enzymatic activity of the gut contents following proper labelling. There are several methods used for the determination of food items taken by the fish, these are: i) Numerical method, ii) Weight method, iii) Volumetric method, iv) Points method and v) Percentage of frequency of occurrence method. Of the above methods, the points and percentage of frequency of occurrence methods were used here.

Source of Information: Bangladesh Journal of Environmental Science, Vol: 12, (No-2), pp: 369-372, 2006, ISSN-1561-9206,

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

It has been observed that Chlorophyceae and Cyanophyceae were the most dominant food items of chapila. Bacillariophyceae (diatom) and Euglenophyceae were less important and Crustacea and Rotifera were the least important in the diet. ln the gut contents of fish, Chlorophyceae was positively and Bacillariophyceae (diatom) were negatively selected throughout the experimental period also though in the pond water, where the abundance of Bacillariophyceae ranked the second position.

Knowledge Management: Journal