Abstract
1/100 acre quadrats were established in Pymatuning Lake for 3 successive growing seasons. One half of the quadrats were screened to prevent the entrance of carp, the others were not. During the 3-year period the average annual growth where carp were excluded was 3.9 g. of air-dried vegetation per sq. m., and where carp were not excluded was 1.4 g. per sq. m. In all quadrats the same relationship existed between closed and open quadrats.

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