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The examination of 63 bottom samples, collected in Lake Huron in 1952 and 1956, revealed
that Pontoporeia affinis was the dominant organism in both deep and shallow water. The
next most abundant organisms in deep water were oligochaetes, fingernail clams, and midge
larvae. Midge larvae were more numerous than either oligochaetes or fingernail clams in
shallow water. The nmnber of organisms per square meter was similar to that determined
from a similar study on Lake Michigan.