Yes, spiders eat silverfish. Spiders are one of the most common natural predators of silverfish in homes, and they actively hunt them in the dark, humid spaces both creatures prefer. If you’ve noticed both pests in your basement or bathroom, that’s not a coincidence. A silverfish population can actually attract spiders into your home as a food source.
Why Spiders and Silverfish Share the Same Spaces
Silverfish need humidity above 75% to survive, which is why they cluster in basements, bathrooms, crawl spaces, and areas around leaky pipes. Spiders thrive in these same high-humidity environments. Both are nocturnal, both prefer undisturbed corners, and both gravitate toward clutter where they can hide during the day.
This overlap in habitat makes silverfish easy prey. Spiders that build webs in basement corners or along baseboards will catch silverfish as they move around at night. Hunting spiders that don’t use webs, like wolf spiders and jumping spiders, will also chase down silverfish on floors and walls. Silverfish are fast runners, but they’re soft-bodied and have no defensive bite or sting, making them a straightforward meal for most common house spiders.
Other Household Predators of Silverfish
Spiders aren’t the only things eating silverfish in your home. House centipedes are aggressive predators of silverfish and can actually help keep their numbers in check. Earwigs will also feed on silverfish when they encounter them. Even cockroaches and ants share these humid environments and compete with silverfish for food, though they’re less likely to prey on them directly.
The presence of silverfish tends to create a chain reaction. A silverfish infestation provides a reliable food source that draws spiders, centipedes, and other predatory arthropods deeper into your living space. So while these predators do provide some natural population control, a heavy silverfish problem often means you end up with more of every pest, not fewer.
Why Spiders Alone Won’t Solve a Silverfish Problem
It’s tempting to think of spiders as free pest control, and to some degree they are. A few spiders in your basement will pick off silverfish regularly. But spiders won’t eliminate an established silverfish population. Silverfish reproduce steadily, laying small clusters of eggs in hidden crevices, and they can live for several years. A handful of spiders simply can’t keep pace with a breeding colony that has access to food and moisture.
The core issue is the environment. As long as humidity stays high and food sources are available, silverfish will continue to thrive regardless of how many spiders are around. Addressing the conditions that support silverfish is far more effective than relying on natural predators.
How to Reduce Silverfish (and the Spiders They Attract)
Since both pests depend on moisture, controlling humidity is the single most impactful step. A dehumidifier in your basement or crawl space can bring relative humidity well below the 75% threshold silverfish need. Fix any plumbing leaks in bathrooms, kitchens, and laundry areas. Make sure crawl spaces have adequate ventilation.
Beyond moisture, focus on removing what silverfish eat and where they hide:
- Declutter storage areas. Cardboard boxes, stacked newspapers, old magazines, and piles of fabric are silverfish magnets. Organized storage with plastic bins makes infestations easier to spot and harder to sustain.
- Dust and vacuum regularly. Silverfish feed on dust, paper particles, and fabric fibers. Removing these food sources from corners, closets, and under furniture makes your home less hospitable.
- Store pantry items in airtight containers. Cereals, grains, flour, and pet food left in original packaging are easy meals for silverfish.
- Seal cracks and gaps. Openings around windows, doors, pipes, and foundation walls give both silverfish and spiders entry points.
- Inspect stored paper and fabric. Periodically move books, photo albums, and stored clothing to disrupt any hidden silverfish activity before it becomes a full infestation.
When you make your home drier and less cluttered, you’re not just discouraging silverfish. You’re also removing the conditions that attract the spiders, centipedes, and other pests that follow them in. Solving the moisture problem typically solves both pest problems at once.