The present study investigated the water quality of Shitalakhya River, phytoplankton abundance, diversity and the effect of pollutants on phytoplankton as well as the primary productivity. The water of the collected samples was mostly alkaline (7.01-8.2) and showed a wide range of variation in EC (1171-2700 μS/cm), TDS (576-1345 mg/L), DO (0.92-2.7 mg/L), free-CO 2 (15-31 mg/L), BOD (12.03-28.38 mg/L) and COD (101.2-109.2 mg/L). A total of 62 species were identified of which 9 belonged to Chlorophyceae, 11 Cyanophyceae, 14 Euglenophyceae and 28 Bacillariophyceae. Among all the members, Bacillariophyceae were found to be dominant and lowest of Chlorophyceae indicates that this group is more sensitive to the pollutants discharged by the industry.

DOI: http://dx.doi.org/10.3329/jueb.v1i0.14548 Jahangirnagar University Environmental Bulletin, Vol.1, 55-66, 2012

In the north-eastern part of Dhaka the 'Turag River' extends over Ashulia thana with a few branches. The north-eastern part of Ashulia thana mainly constitute low lands with a physiography of Madhupur Tract interlaced with Brahmaputra Floodplain. Monsoon extends over these lands from May to October and from July to October these lands remain flooded with a water depth of more than 180 cm to less than 275 cm due to surface runoff of rain water and overflow of the river canals. The area under water during this four month period can be used for economic applications such as various types of fishery as well as enhancing the present recreational applications. For these purposes the physical, chemical, and biological aspects of the water are studied to evaluate its suitability for the applications. The study was held over the period of July through December, 2006, samples being taken once every month. The physical parameters covered transparency, odor, temperature, salinity, EC, TSS, and TDS. The chemical parameters of water studied were pH, DO, BOD 5 , COD, hardness, NO 2 ---N, NO 3 ---N, PO 4 3---P, SO 4 2---S, Cl-, Na, K, Ca, Fe, Ni, Cu, Zn, Cd, Pb, and Hg. Among the biological parameters 'phytoplankton' and 'zooplankton' were qualitatively identified in microscopic observation up to genera. From July to October the water was transparent and of good odor, temperature ranged from 28.2 O C to 24.6 O C, salinity within 0.58 to 0.83 mg/L, EC within 250 to 608 µ mho/cm, TSS 0.42 to 0.82 mg/L, and TDS within 2.8 to 5.2 mg/L. Among the chemical parameters, pH ranged from 6.6 to 7.4, DO within 6.4 to 6.9 mg/L, BOD5 within 1.5 to 3.28 mg/L, COD within 3.04 to 12.89 mg/L, hardness 26.08 to 37.5 mg/L, NO 2 --N from undetectable to maximum 0.562 mg/L, NO 3 --N within 0.539 to 2.158 mg/L, PO 4 3 --P 2.35 to 2.75 mg/L, SO 4 2 --S 0.23 to 0.29 mg/L, Cl-1.65 to 6.16 mg/L, Na 3.6 to 12.5 mg/L, K 9.7 to 11.5 mg/L, Ca 6.52 to 14.82 mg/L, Fe 0.1269 to 0.5062 mg/L, Ni 0.028 to 0.050 µg/L, Cu 0.028 to 0.043 mg/L, Zn 0.023 to 0.048 µg/L, Cd 0.0023 to 0.0043 µg/L, Pb 0.043 to 0.093 µg/L, and Hg was not detected at ppb level. Among the biological parameters a number of phytoplankton were identified covering the classes of Bacillariophyceae, Chlorophyceae, Euglenophyceae, and Cyanophyceae. The zooplanktons included the orders Cladocera and Copepoda within the class Crustacea of phylum Arthropoda.

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This study was conducted on the physico stages (submerged floating, and emerged) of the wetlands of Jahangirnagar were selected along the study area and studied during January 2010 to October 2010. On an average, water P H , dissolved oxygen, acidity, alkalinity, total hardness, nitrate and free CO contained 6.2 ± 0.19; 6.85 ± 0.21mg/l; 36 and 1.6 ± 0.52 mg/l respectively & soil ± 0.18; 6.17 ± 0.89%, 0.27 ± 0.02mg/gm values of water P H , dissolved oxygen, acidity, alkalinity, total hardness, nitrate and free CO stage water were 6.86 ± 0.88; 6.82 ± 0.42 11.2 mg/l and 1.5 ± 0.52 mg/l respectively. And soil matter, were 6.38 ± 0.08; 6.13 ± 0.94%; For emerged stages water P H , dissolved oxygen, floating stage were 6.8 ± 0.26; 6.83 ± 0.37 8.69 mg/l ; 1.7 ± 0.48 mg/l respectively. And were 6.43 ± 0.11; 6.11 ± 0.95%; 0.40 ± 0.02 mg/gm; 0.96 and negative correlations among these parameters were also studied. Strong positive correlations were found in between organic carbon-organic matter (r=0.99) in submerged stage, P 0.79), acidity-free CO 2 (r=0.73), organic carbon stage, P H -dissolved oxygen (r=0.81), organic carbon correlation. Strong negative correlations were found in between alkalinity emerged stage. Organic carbon and organic matter showed significantly strong correlation (r=0.99) in all studied stages. From this study, it was found that, the water P stages than submerged stage. Dissolved oxygen was higher in submerged stages than floating and emerged stages. These may be because of submerged stage was early stage of decomposition process, variation of acidity, alkalinity and total hardness were found in three succession stages. High concentrations of water nitrate were obtained; this may due to the decomposition process on the lakes.

The study was conducted to investigate the physicochemical and biological parameters of fish culture and reconstructed pond at Jahangirnagar university campus. The physicochemical parameters of water in culture and reconstructed pond were analyzed during February to September, 2014 and the mean value of temperature were 30.21±0.89 ºC and 29.96±0.91 ºC, pH value were 7.20±0.29 and 6.97±0.39, Dissolve Oxygen (DO) value were 6.44±0.40mg-1 and 6.22±0.30mg-1, Biochemical Oxygen Demand (BOD5) value were 1.02±0.32mg-1 and 0.78±0.18mg-1, Total Dissolve Solid (TDS) were 0.69±0.04mg-1 and 0.64±0.04mg-1, Electric Conductivity (EC) value were 215.38±21.27?Scm-1 and 128.58±1.10?Scm-1. From the study of biological parameter, it was found that Chlorophyceae and Euglenophyceae were dominant in studied ponds and the abundance of phytoplankton are in the order of Chlorophyceae >Euglenophyceae > Bacillariophyceae > Cyanophyceae. The highest productivity was found in culture pond which indicates the suitability of using for aquaculture.J. Environ. Sci. & Natural Resources, 9(1): 1-7 2016

Appropriate fertilizer and their impact on physico-chemical parameters of water and productivity is very important for aquaculture and ecology. Optimum fertilizer dose can help in fish farmer as well as aquaculture sector. From the study it was found that the total physicochemical parameters of water were suitable for aquaculture, drinking water, irrigation and domestic use. for MCRT-1 to 5 gradually. From planktonic study it was found that the highest phytoplankton and Zooplankton were in MCRT-3. Phytoplanktons were under 27 no. of genera. Their groups were Cyanophyceae, Chlorophyceae, Bacillariophyceae, Euglenophyceae and Hepatecae.Zooplankton were five major taxa and they were Protozoa, Rotifera, Cladocera, Copepod and Ostracoda respectively.