EN
Studies were carried out on the utilization of various carbohydrates by planktonie bacteria isolated from the estuarine lakes Łebsko, Gardno and Jamno. The most actively utilized carbohydrates were glucose, fructose, lactose and saccharose; the least active was rhamnose. Pronounced seasonal variability in the utilization of carbohydrates was found. However, no significant differences were found at the particular research stations.