A one year study of a heavily polluted lake (Kukkarahalli lake) was undertaken to study the behaviour of five enzymes along with their physico-chemical parameters and their relation to plankton production. These enzymes include amylase, phosphatase, catalase and urease activity. Urease activity was almost nil. Total bacteria averaged between 52 and 100 x 107 organisms per liter. Euglenaceae and Myxophyceae dominated most of the plankton population. BOD was quite low and reduced to nil during winter months. Phosphatase activity seemed to be high. Correlation matrix and cluster analysis appear to be handy tools in determining the important factors that control activity in polluted waters.

Address: DOS in Botany, University of Mysore, 
Manasagangotri, Mysore 570 006, Karnataka, India

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