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Quantitative samples of zooplankton from three lakes in the Kigezi District of Uganda have been studied. The systematics of the zooplankton are considered, and some of the identifications given by Worthington & Ricardo (1936) in a previous study of one of these lakes are revised.

Lake Mulehe is the shallowest of the three lakes and contains the largost standing crop of zooplankton. This is in agreement with chemical data which indicato that the supply of nutrient salts in Lake Mulehe is higher than in the other two lakes.

In October 1962 the zooplankton of Lake Mutanda was characterized by the relative abundance of three species of Daphnia which were not found in the samples from the other lakes, although two of these species were present in Lake Bunyonyi in 1931. Rotifers were sparse in Lako Mutands, but here dominant by Tetramastix opoliensis. Lake Bunyonyi was richer in rotifers, but here the dominant species was Keratella tropica, whilo in Lake Mulehe the dominant rotifer was Synchaeta pectinata.

The zooplankton of Lake Mutanda in October 1962 was similar in composition to that of Lake Bunyonyi in 1931, but in 1962 the zooplankton of Lake Bunyonyi was more like that of Lake Mulehe. The possible causos of this change are discussed.