A large sample rich in empty Bithynia tentaculata (Linnaeus, 1758) was collected in a drift-line along Lake IJssel, The Netherlands. Of 400 adult Bithynia shells 62 (15.5%) showed repair of a damaged outer lip, most probably due to failed attacks by predators. The roach Rutilus rutilus (Linnaeus, 1758) was probably its main shell-crushing predator here. However, repair after physical damage by waves breaking on the stones of the dike cannot be excluded completely.

Freshwater gastropods, Bithynia tentaculata, predation, shell repair, The Netherlands, Lake IJssel
Vita Malacologica
Staff publications

Cadée, G. C. (2015). Shell repair in the freshwater gastropod Bithynia tentaculata (Linnaeus, 1758). Vita Malacologica, 13, 31–34.