In the Abcoudermeer, a small lake S.E. of Amsterdam, the rubble banks were investigated on macro-invertebrates. At least 46 species were encountered, insects and their larvae not included: 1 species of sponge, 1 species of hydrozoan, 6 species of free-living flatworms, 17 species of snails, at least 3 species of mussels, 8 species of leeches, 3 species of crustaceans and 7 species of bryozoans. Differences between two banks are discussed.