Growth in a freshwater snail under laboratory conditions in relation to eutrophication

Shell growth in the snail Potamoryrgus jenkinsi (Prosobranchia, Hydrobiidae) was measured under laboratory conditions. Individuals of populations from two lakes differing in trophic status were kept in water with sandy substrates from each environment. Growth was faster in the environment of the more eutrophic lake, regardless of the origin of the snails; this held in particular for the smallest size class.