A preliminary survey of aquatic habitat in the Periyar River - A tributary to the Cochin backwater system

1974 Japanese Journal of Limnology (Rikusuigaku Zasshi)  
The river water near the industrial belt showed very high concentration of plant nutrients especially of inorganic phosphate and nitrite. They were above the limit of water pollution and were responsible for eutrophication. Dissolved silicate in the river water was not affected by the industrial discharges. The sediments along the river bed were sandy except near the outfalls of the effluents where the sediment is muddy and of a milky colour. Macrobenthos were absent in the vicinity of the
more » ... trial complex except near the outfalls of the wastes where certain species of isopods and polychaetes were adapted to the polluted environment even though the water column at all stations were well aerated by the river flow.
doi:10.3739/rikusui.35.18 fatcat:ve6stjy225arfmucwklae6zdvu