Analysis of Physico-Chemical Water Parameter and Zooplankton of Village Pond “Kamalpokhari” of Kamalvinayak, Bhaktapur

Abstract

The present study entitled, “Study of physicochemical water parameter andzooplankton of village pond“Kamalpokhari” of Kamalvinayak, Bhaktapur wasconducted from 14 th August 2012 to 6 x th February 2013, for a period of six months.The main objective of this work was to analyze the physico-chemical parameters andto investigate its relation with zooplankton production. The study site was dividedinto three station , namely station A,B and C. The water samples from each stationwere collected throughout the study period between 7.00 to 9.00 am. The physicalparameters such as temperature, depth, transparency, water colour, nature of the daywere observedon the field itself. The analysis of chemical parameters such as pH,hardness, DO, CO , alkalinity were examined on the very day. The qualitative andquantitative analysis of zooplanktons was also carried out in the lab of CentralDepartment of Zoology. The variation in colour of water was observed distinctly inwinter and summer season. The fluctuation in transparency of the pond water was lowin rainy season and high in winter. The variation in temperature may be due to theseasonal changes as well as weather conditions. The high temperature was recordedduring summer season and low in winter. The average pH value of the pond waterwas found alkaline (8.1), which was suitable for aquatic life. The dissolved oxygenranged between 3.3ppm to 7.5 ppm with the average of 5.7 ppm. And positivecorrelation coefficient was found between dissolved oxygen and zooplankton fromthe statistical analysis.The free carbon dioxide fluctuated from0 to 8 and was absentin13 th and 30 th 2 October. Total alkalinity ranged from 116.6 to 185.3. The totalhardness ranged from5 to 21.67. From the statistical analysis positive correlationbetween alkalinity and zooplankton and negative between hardness and zooplankton.The zooplanktons were more densely found during summer season and their densitywas low in winter. In the present investigation, two genus of rotifer i.e. Keratella,Brachionus, one genus of Cladocera i.e. Daphnia and two genus of Copepoda i.e.Cyclops and Diaptomus were recorded. The total zooplanktonic abundance in thepond was 1944 no./liter during the study period, which showed the fortnightly densityof 161.1 no./liter.