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Physicochemical Condition of Two Nursery Ponds at Iswarganj, Mymensingh

M. Kabil Hossain
Institute of Biological Sciences, Rajshahi University

M. D. Hossain
Department of Fisheries, Rajshahi University

M. Habibur Rahman
Department of Zoology, Rajshahi University, Rajshahi,

R. Afza
Institute of Biological Sciences, Rajshahi University

D. A. Khanom
2Department of Fisheries, Rajshahi University

Abstract/ Executive Summary:

The research work was conducted to measure the nursery pond water quality parameters during the period of June 2006 to May 2007 in Mymensingh. The highest value of water temperature, alkalinity, ammonia, free carbon dioxide, DO, PH and hardness was 30.20C (May’07) in pond-1, 174ppm (Feb.’07) in pond-2, 3.5ppm(July’06) in pond-1, 8.5ppm (Dec.’06&Jan.’07) in pond-1, 9ppm (July;06) in pond-1(also in April in pond-2), 8.4 (June’06) in pond-2 and 175ppm (Sep.’06) in pond-2 respectively. The lowest value of these parameters was 180C (Jan.’07) in pond-2, 70ppm (Nov.’06) in pond-1, 0.03ppm (Sep.’06) in pond-2, 4ppm (Sep.’06) in pond-2, 5.5ppm (June’06) in pond-1, 6.2 (Oct.’06) in pond-2 and 64ppm (March’07) in pond-1. The value of physicochemical parameters of water had more or less significant combined effect on one another.

Keywords: Physicochemical, nursery pond, fish fry, disease

Location: Mymensingh

Start Date: 01-06-2006

End Date: 31-05-2007

Program Area: Resource Development and Management

Commodity:

Objectives:

It was presumed that the parasite fauna of any particular habitat was determined by a combination of various ecological factors. The present study was designed to investigate the water quality parameters of two nursery ponds at Iswarganj, Mymensingh district in Bangladesh.

Methodology:

Two nursery ponds were selected at Iswarganj, Mymensingh for this research. One pond was 20 decimal in area and 4 feet in depth where other one was 15 decimal in area and 3.5 feet in depth. The water from these two nursery ponds was collected and studied the physicochemical parameters once in a month. The study in this context was conducted from June 2006 to May 2007 at Iswarganj in Mymensingh district. These ponds are used as nursey ponds for 6 months and then fingerlings are left in this popnd for 6 months for growing as market fish. This time water depth was kept upto 6 feet. The woner keeps water all the year round in these ponds. In order to observe seasonal changes in occurrence of the parasites, infected fishes were collected seasonally. The fishes were caught from the study areas using dip nets and different mesh sized cast nets. Fingerlings were shifted in water filled polyethylene bags containing 3-5 times more air than water. After having removed the fish from the water, the colour of the body was noted (decolouration, darkening, blackening etc.), as well as the presence of any cloudiness of the skin (gray or white), reddening, ragged or torn fins, raised scales, white spots or parasites visible to the naked eye. The skin was always examined with a magnifying glass. Attention was paid to the natural openings and to the skin, in order to detect the presence of areas of trauma, ulcers, abscesses, loss of colour and parasites. Parasites were idenfied following the methods of Kabata, 1985. Water quality data viz. temperature (⁰C), PH, unionized ammonia (ppm) and alkalinity(ppm), dissolved oxygen (ppm), free carbon-dioxide (ppm) and total hardness (ppm) were recorded on the spot during sampling using portable Hach Kit (FF-2). Most samplings of water were done between 7 A.M. to 11 A. M. from the surface layer near the shore. Mean ± SD and corelation coeficent were calculated following the method of Mian and Miyan, 1984. All the data from two nursery ponds were recorded accordingly for the convenience of study.

Source of Information: Univ. j. zool. Rajshahi Univ. Vol. 27, 2008 pp. 43-46 ISSN 1023-6104

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Fish cannot take O₂ if carbon dioxide remains high in water. O₂ transportation of blood decreases. As a result fish suffer from suffocation and die. So there was a relationship of fish disease with the value of water quality parameters. The water quality parameters fluctuate mainly in winter and in sometimes in summer. On the other hands fish become affected with diseases in these season. Fishes were infested more by protozoan parasites than by monogenean. Measure should be taken to control the water level fluctuation, aquatic vegetation, organic debris and water pollution. Checking of water quality, prevention of algal bloom and control of O₂ depletion should be maintained as well. The out standing results of such type of study will provide clue to further studies in different aspects of the water quality parameters as well as parasites of freshwater fish, which will be of much helpful for the development of fish nursery and ultimately will contribute to the production of fishes for the nation.

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