Aovijite Bosu*
Bangladesh Fisheries Research Institute, Mymensingh-2201, Bangladesh
Md. Moniruzzaman
Bangladesh Fisheries Research Institute, Mymensingh-2201, Bangladesh
SM Priyongkor Roy
Department of Fisheries Management, Bangladesh Agricultural University-2202, Bangladesh
Bipul Chandra Roy
Department of Fisheries Technology, Bangladesh Agricultural University-2202, Bangladesh
Water quality, Monthly, Change, pH, Chemicals
At Faridgonj Upazila, Chandpur District
Crop-Soil-Water Management
The study was conducted in ten ponds for a period of three months from January, 2015 to March, 2015. The experimental ponds are situated at Faridgonj Upazila, Chandpur District, Bangladesh. To observe the physico-chemical conditions of the ponds, water samples were collected at monthly interval. The research was conducted in a completely randomized design into three treatments where three treatments (T2, and T3) have three replications and treatment T1 have four replications. Ponds were selected by size, shape, water colour and surrounding conditions. Present study includes three treatment where treatment 1 (T1) represents small sized pond (6 to 8 decimal), treatment 2 (T2) represents medium sized pond (8to10 decimal) and treatment 3 (T3) represents large sized ponds (15 to 18 decimal). All of the selected ponds receive domestic wastes and decomposed organic nutrients from the neighboring households. Pond water is directly used for personal hygiene, washing of clothes, dishes and household materials, bathing of cattle etc. In addition surface run-off also entered into the ponds. All the ponds are also used for traditional fish culture for carps, tilapia etc. No supplemental feed and fertilizer was used for fish culture but sometimes lime was used. The pond owner complained that the growth performance of fish is very poor. Fish mortality is a regular feature in those ponds, and it increases on cloudy days and after rainfall. The color of the pond water was found dark green, red paint covered or greenish throughout the study period. Moreover the ponds contain heavy silt particles and toxic plastic materials from the neighboring houses.
Analysis of Water Quality Parameters A number of water quality parameters such as temperature ( 0C), transparency (cm), dissolved oxygen(mgl-1), pH, total alkalinity (mgl-1), chlorophyll-a (µgl-1), ammonia-nitrogen (mgl-1), phosphate-phosphorus (mgl-1), nitrite-nitrogen (mgl-1) and nitrate-nitrogen (mgl-1) was measured at monthly interval. Temperature and transparency were measured on the spot and rest of the above parameters was measured in the Limnology Laboratory, Bangladesh Fisheries Research Institute, Riverine Station, Chandpur.
Collection and treatment of water samples For the analysis of water quality parameters, water samples were collected within 9.00 to 11.00 AM on each sampling day. Water samples were collected in plastic bottles with stopper having a volume of 500 ml each and marked with pond and sampling numbers. All of the plastic bottles were covered by black color tape. Water samples were collected by using a tube sampler (3-4 feet) in a manner that it is representative of all layers of the water column. Then the samples were carried out on the laboratory and 250 ml of water sample from each bottle was filtered through glass fibre filter paper (Whatman GF/C) with the help of electronic vaccum pressure air pump for nutrient and chlorophyll-a analysis.
Statistical analysis For the statistical analysis of the data, a one-way ANOVA (Analysis of Variance) & DMRT (Duncan’s Multiple Range Test) was done by using the SPSS (Statistical Package for Social Science) version-16. Significance was assigned at the 0.05% level. Means were given with standard deviation (± SD).
International Journal of Applied Research 3(3),21-28, Sept. 2017
Journal