Silverfish are **shredders**. Shredders are...
> ...responsible for processing coarse particulate organic matter (CPOM). CPOM is greater than 1 mm in size and typically derived from allochthonous sources, such as **woody debris** , **leaves** , and other **vegetation** [..].
Their **diet** includes sources of starch and protein, including grains, vegetables, fibers, sugars and fabrics. Silverfish can actually digest cellulose, a feat not shared by many animals. They are able to do so thanks to cellulase activity in microorganisms that live in their gut (Lasker & Giese, 1957).
**Reference**
**-** Lasker & Giese, _J Exp Biol_ (1957) **33** (3): 54–553