Just to add some info on mollusk age...
Neritidae generally live from 5 to 7 years, but most species in the genus
Theodoxus in Europe and northern Africa live less than 2 years. On the
other hand, Clithon retropictus of Japanese freshwaters lives for more than
20 years. I have kept a few different species in aquariums and all seemed
to fit the 5-7 year average life span.
Tom E.
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