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 : dndas2011@gmail.com
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Publication
Data
Paper received:
17 June 2014
Revised received:
12 March 2015
Accepted:
20 March 2015
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Abstract
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 ?Scm-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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