(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.
1 Snails and other gastropods feed by using a mechanism called a 'radula'. 2  The radula works to collect the food from the substrate surface, acting like a conveyer belt in order to bring the bits of algae into the back of mouth. 3  The radula may have hundreds of rows of teeth and over a hundred teeth per row.