(of fish) migrating from salt water to spawn in fresh water, as salmon of the genera Salmo and Oncorhynchus (distinguished from catadromous). Origin of anadromous.
A: A snail scrapes its food, rather than chews it like we humans do. A flexible structure called the radula in the snailâs mouth is lined with neatly organized rows and columns of tiny tooth-like projections. The snail moves its radula over the food, scrapes off bits of it, and swallows.
This abstract image is a close-up of the tiny teeth that cover the radula of a common whelk (Buccinum undatum). A radula is a tongue-like ribbon that helps the snail scrape or cut its food before it swallows it.