Silverfish, also called fishmoth, is a small, wingless insect. Its common name derives from the animal's silvery light grey and blue color, combined with the fish-like appearance of its movements, while the scientific name (Lepisma saccharina) indicates the silverfish's diet of carbohydrates such as sugar or starches.
Silverfish are wingless teardrop-shaped insects that are generally soft bodied. They are flattened from top to bottom, elongated and oval in shape, have three long tail-like projections at the end of the abdomen, and two long antennae. Silverfish measure 1/2 to 3/4 inches in length and grow from egg to adult without visible change in appearance. They are white to brown-grey or bluish-silver in color with a metallic shine because their bodies are covered with fine scales. Silverfish are nocturnal and move very quickly. They are secretive, and the severity of an infestation may go unnoticed for long periods of time, allowing for exponential growth. Silverfish also reproduce quickly.