Is a Silverfish a Fish or a Worm?

At first glance, a silverfish looks shiny and scaly, just like a fish. A closer look will reveal that the silverfish looks more like a worm than a fish. But because the silverfish resembles a shiny fish, the name seems fitting. In the end, the silverfish is not a fish, it is a worm.

Silverfish (Lepisma saccharina L.), also called the urban silverfish or the fishmoth, are nocturnal insects and they can be found outside or inside the home. Outside, silverfish can be found in ant and termite nests, under rocks, in bark and leaf molds, and in nests. When found in the home, silverfish can be found hunting for food and moisture. While they can be found anywhere in the home, silverfish are commonly found in the bathtub, washbasin or sink. They tend to crawl into these spaces in search of moisture only to get trapped inside as they are unable to climb out.


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Silverfish can measure anywhere from a half inch up to an inch in its adult stage. Its body is small and it has no wings. The silverfish is also silver-blue in color and up close, it has the appearance and shape of a fish, hence the name silverfish. Although the silverfish is silver-blue in color, during it’s first few molting phases it may be dark brown in color. The silver-blue scales do not develop on the silverfish until after its third molt. Silverfish may undergo many molts throughout its lifetime and it actually continues to molt even after reproduction occurs. The silverfish is one of the few insects that continue to molt after mating.

While silver fish will eat just about anything, they prefer to eat vegetables with high protein and carbohydrate content, but they will eat just about anything. This makes them even more of a pest to homeowners because they will eat through fabrics such as rayon, silk, cotton, and linen as well as breakfast cereal, flour, paper, wallpaper, glue, gum, photographs, starch, sugar, molds, and dried meats.

Silverfish can cause a significant amount of damage to food, clothes, and household materials, but they are harmless to humans. This means that they do not intend to bite humans. The can nip and curl up if handled, but the nipping is not strong enough to break human skin. Individuals with allergies may develop a rash, but this is uncommon.

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There are several ways to get rid of silverfish. Sanitizing your home along with the use of aerosol insecticides will help control silverfish. It’s best to remove anything that may be considered a hiding place for silverfish to lay their eggs such as piles of old papers, clothes, books, and boxes. Once you have removed these hiding places, say to space in the basement, simply add moth crystals to the boxes to prevent re-infestation. If the infestation is severe, call an exterminator. An exterminator will drill holes in the walls and administer chemicals to kill existing silverfish and prevent eggs from hatching. Silverfish get into the home through cracks and crevices, to extermination an extremely effective method.

Silverfish also have natural predators such as earwigs and house centipedes. It’s up to you if you would like to keep these pests around to control the silverfish population in your home.

Author: The Top Worm

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