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Fisheries Eco-biology of Beel Koshba in Naogaon District

Md. Nur Islam
Former UNO, Charghat Up-Zilla, Rajshahi

Md. Safinur Rahman
Department of Zoology, University of Rajshahi,

Md. Redwanur Rahman
Institute of Environmental Science, University of Rajshahi, Rajshahi

Abstract/ Executive Summary:

The physical conditions of Beel Koshba consisting of water temperature (25.36±5.12°C/day), water depth (204.96±110.36cm/month) and water transparency (30.91±6.78 cm/day) were recorded. The chemical parameters of total hardness, alkalinity, pH, DO, CO₂ and ammonia were 146.60±13.36 mg/l, 143.30±9.33 mg/l, 7.05±0.75, 6.03±1.08 mg/l, 8.64±0.88 mg/l and 0.73±0.31 mg/l respectively. A total of 54 species of different vegetations 123 species of phytoplankton and 73 species of zooplankton were recorded from the beel. A total of 104 species of fish and Annelids (8), arthropods (12), molluscs (15), amphibian (8), reptiles (21), avis (40) and mammals (12) were identified. Pesticidal toxic effluents contexts were also observed in the beel ecosystem.

Keywords: Fisheries, Eco-Biology, Beel Koshba

Location: Naogaon District

Start Date:

End Date:

Program Area: Resource Development and Management

Commodity:

Objectives:

The main objectives of this paper are to assess the eco-biology on the Beel Koshba.

Methodology:

Water samples were collected with the help of a glass-stoppard bottle wrapped with black paper. After collection samples were brought to the research laboratory, Institute of Environment Science, University of Rajshahi. Chemical analysis were also done immediately after arrival Soil samples were collected twice in a year and analyzed from the Soil Research Development Institute (SRDI), Rajshahi. Water depth was measured monthly. A metal was set at the sinking end of the measuring nylon tape. Sometimes a standard bamboo pole was used for this purpose. A centigrade thermometer with a range of 0°C to 110°C was used to measure the water temperature at the time of sample collection. Transparency was measured by Secchi disc and expressed in cm. The chemical parameters of the beel water viz. dissolved oxygen (DO), free carbon dioxide (CO₂), ammonia, total hardness and alkalinity were analyzed by HACH Test Kit (Model FF-1A). The pH value of pond water was measured by digital pocket pH meter and titration method. Fishing was done during daytime using traditional basket traps fabricated from bamboo and funnel bag nets locally know as sruti jal. Specimens sampled were immediately chilled in ice on board and later fixed with 10% formalin in the laboratory. Habit and habitats and detailed ecosystems were studied following Odum (1971). For identifying the hydrophytes consultation are made with Khan & Halim (1987). The phytoplanktons were identified following Fritch (1965) etc. The zooplanktons were identified following Ward & Whipple (1959). Identification and key characters of fish were made with Rahman (1989). The bird identification was made using Ali & Ripley (1968-72). The wildlife species were identified by Khan (1982). Identification of the molluscan species was made using Jahan et al. (2003). The earthworm species were identified by Jahan et al. (2005). The toxic metals like copper, zinc, mercury, cadmium, chloride and DDTE (Dichloro Diphenyl Trichloro Ethene) were analyzed from SRDI-Rajshahi, SRDI-Farmgate, Dhaka and Bangladesh Agriculture Research Institute (BARI), Soil Science Division -Joydevpur, Gazipur

Source of Information: Univ. j. zool. Rajshahi. Univ. Vol. 28, 2010 pp. 33-39

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The following suggestions may provide the sustainable development of natural resources of beel khosba. Natural habitat of fishes and other aquatic resources should not be disturbed as much as possible. To conserve and develop biodiversity, fish and fisheries items, habitat should be improved through excavating bed for brood one. Any poisonous or toxic substance should not be applied in the water body. Use of pesticides, weedicides and insecticides in the agricultural lands should be reduced to a tolerable limit and IPM (Integrated Pest Management) procedure should be encouraged. Beel area should be kept out of any type of environmental hazards. Endangered species should be conserved in a favourable condition. Open water stocking programme would be taken under proper management system. Community Based Management System should be also taken under proper supervision of local administration. Public and mass people participation have to be ensured in the integrated and sustainable natural resource management

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