Silverfish in Delaware: How to Spot Them and Get Rid of Them

What they look likeSignsAre they dangerous?How we treat themPreventionFAQ

What do they look like?

Silverfish are wingless, flat, and scaly, about 1/2 to 3/4 inch long, and silver to brown. Their bodies taper toward the back and end in three long bristles. They move fast and hide in bathrooms, basements, attics, and garages. They like it warm and humid, around 70 to 85 degrees with 70 to 90 percent humidity, and they often ride in on cardboard boxes of books and papers.

Signs you have them

• Uneven holes or notches in paper, books, wallpaper, or fabric
• Yellow stains on paper or fabric
• Tiny scales left behind
• Small black droppings that look like pepper

Are they dangerous?

Silverfish don't bite and don't spread disease. They're a damage pest. They eat paper, wallpaper, book bindings, glue, clothing, and pantry foods like flour and oats. Old books and papers stored in a damp basement or attic are what usually take the hit.

How Wolfe treats them

Silverfish come down to humidity. We treat the areas where they hide and feed, and we help you find the moisture that keeps them around, like leaks or a damp basement. Treatment works best when the humidity comes down too. All of our work comes with a 30-day warranty. If pests come back within 30 days of a treatment, call us and we'll come back out at no extra charge.

How to keep them out

• Run a dehumidifier in basements and other damp rooms.
• Fix leaks and remove wet or moldy wood.
• Keep old books and papers out of basements and attics.
• Store flour and sugar in sealed containers.

Common questions

Sources: PestWorld (NPMA): Silverfish

Last reviewed October 2026 by Wolfe Pest Control.