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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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        Abstract - Issue Sep 2015, 36 (5)                                                                                                             Back

nstantaneous and historical temperature effects on a-pinene

Physico-chemical qualities of water in high altitude rice fish farming system of Ziro valley, Arunachal Pradesh, India


Rajashree Saikia1, Tapati Das1 and  Debangshu Narayan Das2*

1Department of Ecology and Environmental Science, Assam University, Silchar - 788 011, India,

2Department of Zoology, Rajiv Gandhi University, Rono Hills, Doimukh - 791 112, India

*Corresponding Author’s E-mail :




Publication Data

Paper received:

17 June 2014


Revised received:

12 March 2015



20 March 2015



Water in rice fields of mountain valley of Ziro, Arunachal Pradesh was investigated for physico-chemical characterization during rice fish farming season (Kharif) of 2013. Water temperature, dissolved oxygen, biological oxygen demand, free carbon dioxide, nitrate-nitrogen, phosphate-phosphorus, chloride, total hardness, calcium hardness, alkalinity, pH, total dissolved solids, specific conductivity and water depth were studied. This study revealed that the physical parameters of water in rice fields like water temperature, pH, total dissolved solids, specific conductivity and water depth were 23.5–31.3°C, 5.9–6.9, 250.34-370.5 mgl-1, 437.75-660.33 µScm-1 and 3.72-16.9 cm respectively. The chemical features like dissolved oxygen, biological oxygen demand, free CO2, nitrate–nitrogen, phosphate–phosphorus, chloride, total hardness ,Ca hardness, alkalinity were 2.4-12.9 mgl-1, 1.5-11.1mgl-1, 9.7-23.35 mgl-1, 1.28-3.9 mgl-1, 0.005-0.539 mgl-1, 16.6-46.8 mgl-1, 13.9-34.5 mgl-1, 9.6-13.53mgl-1 and 23.16-43.34 mgl-1 respectively. On the other hand, investigation on planktonic life forms indicated the presence of 13.5×103-84.9×103 indl-1 and 1.23×103-4.86×103 indl-1 phytoplankton and zooplankton respectively during the Kharif season. The above physio-chemical parameters were found to be conducive for raising fish as companion crop of rice due to occurrence of diversified planktonic life forms in underneath water.     



 Key words

Fishery, Plankton, Rice field, Water quality, Ziro valley



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