This vegetation type is dominated by Najas minor, a submerged macrophyte species, which may grow across the entire water column. It is found in mesotrophic to eutrophic, calcium-rich water, often with elevated concentration of chlorides, especially in fishponds, fish storage ponds, alluvial pools, and flooded pits in river floodplains. These water bodies are usually 20–50 cm deep and frequently contain a layer of organic mud on the bottom. In the Czech Republic this is a rare, ephemeral association, so far recorded in the České Budějovice Basin, southernmost Moravia, and the Ostrava region.