Why Are They Called Silverfish (When They’re Not Fish)?
If you’ve ever turned on the bathroom light and caught a quick flash of something silvery darting across the floor, chances are you’ve met a silverfish. Despite the name, these strange little bugs aren’t aquatic and definitely aren’t fish — but their name tells you a lot about how they move and look.
At Specter Pest Control, we get questions about these elusive pests all the time:
- What are silverfish?
- Are they dangerous?
- How do I get rid of them?
In this post, we’ll break it all down: what silverfish are, how to identify them, why they love damp spaces like bathrooms and basements, and what homeowners can do to keep them out for good.
What Is a Silverfish?
Silverfish are small, wingless insects known for their distinctive shape and quick, wriggling movement. They get their name from their:
- Silvery-gray color, which gives them a fish-like sheen
- Slithering movement, which resembles the way a fish swims
Silverfish are usually about ½ to 1 inch long, with flattened, carrot-shaped bodies and three long bristles at the end of their tail. They’re nocturnal, so you’ll usually spot them darting around at night — often in bathrooms, laundry rooms, attics, or anywhere humid and dark.
Why Do Silverfish Invade Homes?
Silverfish have very specific needs, and your home may check all the boxes without you even realizing it.
Here’s what draws them inside:
Moisture
These pests thrive in high humidity, which is why they’re so commonly found near plumbing, in crawl spaces, or around leaky windows.
Darkness
Silverfish are highly light-averse, which is why they often appear when you flip on a light or open a box that’s been sitting for a while.
Food Sources
Silverfish feed on carbohydrates, especially starches and sugars. But their idea of food includes:
- Book bindings and paper
- Glue and wallpaper paste
- Dandruff, hair, and dead skin cells
- Pantry items like flour or cereal
Basically, if it’s organic and contains starch or sugar, silverfish are interested.
Are Silverfish Dangerous?
The good news: silverfish don’t bite, sting, or spread disease.
The bad news: they can still cause property damage over time. In large numbers, silverfish can chew through:
- Stored clothing (especially cotton, linen, and silk)
- Cardboard boxes
- Books and documents
- Wallpaper and old photos
They can also contaminate stored food items. So while they aren’t harmful to people or pets, they’re still unwelcome guests — and they often signal a moisture issue in the home.
Signs of a Silverfish Infestation
Most homeowners spot silverfish by accident. But here are a few signs you may have a hidden infestation:
- Sightings at night, especially in bathrooms or basements
- Feeding damage, like small holes in clothing, books, or wallpaper
- Yellowish stains or shed scales on papers or shelves
- Tiny pepper-like droppings in corners or cabinets
Silverfish are secretive and fast, so even a few sightings could mean there’s more hiding in cracks or behind walls.
How to Prevent Silverfish
Keeping silverfish out of your home comes down to moisture control and good housekeeping. Here’s what we recommend:
Fix Leaks and Seal Cracks
Check for leaking pipes, dripping faucets, or any area where water collects. Seal up gaps around baseboards, vents, and foundation cracks.
Use a Dehumidifier
In particularly humid areas like basements or laundry rooms, using a dehumidifier can make the space less inviting for silverfish.
Store Paper and Clothes Properly
Avoid keeping cardboard boxes, books, or seasonal clothes in damp areas like the garage or crawlspace. Use airtight containers instead.
Clean Up Food and Dust
Wipe down shelves and vacuum regularly, especially in hidden corners where dust and food particles can accumulate.
When to Call the Pros
If you’re seeing silverfish regularly — or finding damage to clothing, books, or wallpaper — it’s time to bring in backup.
At Specter Pest Control, we offer modern, low-impact solutions to deal with silverfish and other moisture-loving pests.
Schedule your free home inspection today and let Specter Pest Control help you tackle silverfish — and whatever else might be creeping around unseen.
