Silverfish Identification and Control

Silverfish are found throughout the United States. They get their name from their silvery color and fish-shaped bodies. Typically, they live in moist, humid areas of the home, such as basements, attics, and bathrooms. For instance, they’re often seen in upstairs bathrooms because they live in the attic and come down in search of moisture. In addition, they are common in homes with shake-style roofs. Because they hide in remote areas, they can cause significant damage before anyone notices them.

To identify a potential infestation, look for feeding marks on clothing, books, insulation, paper, and other starchy materials. You might also find yellow stains, shed scales, or black pepper-like feces. Equally important, stored sewing fabric or craft containers can be hidden sources. For that reason, it’s wise to inspect used books and boxes before bringing them inside. In many cases, a dehumidifier can help control moisture and reduce silverfish activity.

Outside the home, anything stored against the exterior—like firewood or cardboard—can provide shelter. From there, silverfish can climb walls and slip through gaps near windows, pipes, or vents. That is why, sealing those entry points with caulk is important. Similarly, shake-style roofs should be cleaned and sealed to prevent future problems. All things considered, keeping the outside of your home clean and dry will help discourage silverfish.

Color – Gray and metallic

Length – Ranges from 1/4” to 1”, with a carrot-shaped body.

Diet – They feed on starches like flour, cereal, paper, wallpaper, cotton, and glue.

Habitat – These pests prefer dark, damp areas and move quickly when disturbed.

Impact – Over time, their feeding can lead to costly damage.