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.

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Vita Malacologica
Staff publications

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