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Physico-chemical Properties of Dhepa River in Dinajpur District of Bangladesh

K. Rakiba
Department of Fisheries Management, Hajee Mohammad Danesh Science and Technology University

Z. Ferdoushi
Department of Fisheries Management, Hajee Mohammad Danesh Science and Technology University

Abstract/ Executive Summary:

Among different water quality parameters dissolved oxygen, transparency, pH, PO₄-P and depth varied significantly among the sampling sites. The pH value in the present investigation remained a buffer condition (6.50- 7.90). Dissolved oxygen was ranges from 3.80 to 11.60 mg/l throughout the study periods. PO₄-P concentration was observed highest (0.30 mg/l) in sampling site 2. On the basis of physical, chemical aspects sampling site 3 and sampling site 5 (situated in gosaipur and chandandoho) found in better condition in terms of limnological aspects. However, it could be concluded that Dhepa River will play important role in riverine fisheries and for further fisheries management.

Keywords: Chemical properties, River water, Water quality

Location: River Dhepa in Dinajpur district

Start Date: 00-09-2011

End Date: 00-04-2012

Program Area: Resource Development and Management

Commodity: Water quality

Objectives:

1. To provide baseline data and determine their occurrence for management decision in the management of the fishery.

Methodology:

River Dhepa in Dinajpur district was selected for the purpose of the study. It is located in Dinajpur district within latitudes 25º38'N and 25º53'N and longitudes 88º37'E and 88º43'E. The river originated from the right-bank of the Atrai near Mohanpur and flowing southeast direction. Then it turned south near Setabganj, Bochaganj and then it falls into the Punarbhaba river. Six sampling sites were established along the length of Dhepa River. Sites were chosen in such a manner to provide for even distance for effective sampling. The distance from each site was 1 km. The sampling procedure was carried out in Dhepa River from September 2011 to April 2012. The water samples from Dhepa River were collected from six sites between 8 to 10 hours, in plastic bottles fortnightly. The water samples were immediately brought in to Laboratory for the estimation of various physico-chemical parameters like total alkalinity, nitrate-nitrogen and phosphate-phosphorus. Water temperature, air temperature, depth, pH, dissolved oxygen and transparency were recorded at the time of sample collection, by using Thermometer, Digital Dissolved Oxygen Meter and pH Meter. Transparency was measured with the help of Secchi Disc. While other parameters such as Alkalinity, Phosphate and Nitrate were estimated by using Standard Methods and HACH Kit. The comparison between means ± SD (standard deviation) was tested for significance by using one-way ANOVA analysis and Tukey’s test. The statistical analyses were calculated, using SPSS.

Source of Information: J. Environ. Sci. & Natural Resources, 6(1): 59 - 67, 2013; ISSN 1999-7361

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Among the value of different parameters water temperature (17- 33.50°C) and alkalinity (15-65 mg/l) in six sampling sites were not varied significantly. Transparency range was (8.10-48.7 cm), highest and lowest value found in St.2 in February and September respectively. Highest water depth was observed in the month of September and lowest in April. The pH value of Dhepa river was slightly acidic to slightly alkaline in all sites. Highest dissolved oxygen concentration (11.60 mg/l) was observed in December and lowest concentration (3.80 mg/l) was found in April. Dissolved oxygen concentrations in all sites except St.2 in March are suitable for fish culture. Nitrate-nitrogen concentrations in all sites are more than 10 mg/l because of anthropogenic activities. In low water temperature phosphate-phosphorous concentration was high.

Knowledge Management: Journal