Meromictic lakes have two chemically stratified layers. The difference in salt concentrations creates constant density stratification between near-bottom and shallow water. The lower layer (monolimnion) possesses higher salinity and does not mix with the upper layer (mixolimnion). These two layers are separated by chemocline. Fauna of meromictic lakes around White and Baltic Sea is not investigated well. In this work we studied meiofauna, and especially nematodes of meromictic and related lakes of Kandalaksha Bay of the White Sea. We took and investigated probes from nine highly different lakes. For Кislo-Sladkoye lake situated in Primorskii settlement (White Sea Biological Station of Moscow State University) vicinity we created a full species list. Nematodes make the majority of bental community in this lake. They amount to a million individuals per square meter and comprise 22 species. For the other lakes we obtained quantitative data for different taxa of meiobenthos.