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Insects

Silverfish

Lepisma saccharina

Danger Level: 2/5Updated September 2026 · Boise, ID

IdentificationHow to Identify Silverfish

Quick Answer

Silverfish are small, carrot-shaped bugs covered in silvery scales. They have two long antennae and three tail-like appendages off the back end.

Full identification notes

The name comes from how they move (a fish-like, wiggling shimmy across the bathroom tile at night). They're wingless and stick to dark, humid spots.

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Silverfish Behavior & Habits

Understanding how silverfish behave helps prevent infestations

Silverfish hide all day and come out after the lights go off.

More about their habits

They live an unusually long time for a bug, up to 8 years. Their diet is starch and sugar, which means paper, book bindings, wallpaper paste, cardboard, and even starched clothing. They can survive months between meals as long as the humidity stays up.

Silverfish Risks & Dangers

What silverfish can do to your health and property

Health Risks

Silverfish don't bite and don't carry disease.

Property Damage

Silverfish chew through books, papers, wallpaper, photos, and clothing.

Full health and property details

Health Risks

They're mostly a nuisance, though a small number of people are allergic to the scales they shed into household dust.

Property Damage

Anything with starch or cellulose is fair game. The damage shows up slowly, so a stored box of family photos or a forgotten shelf of paperbacks in the basement can take a real hit before anyone notices.

Signs of Silverfish Infestation

Look for these indicators in your home

Signs You Have Silverfish

What homeowners spot first

  1. Fish-shaped, silver bugs darting along bathroom tile or basement floors at night
  2. Tiny yellow stains or pinhole chew marks on books, photos, and stored paperwork
  3. Pepper-like specks (their feces) in drawers, closets, and inside cardboard boxes
More signs to look for
  1. Shed scales that look like fine silver dust in storage areas
  2. Loose wallpaper edges and chewed book bindings, especially in humid rooms

Silverfish in Boise & the Treasure Valley

Most of our silverfish calls come out of older homes with full basements.

More on what we see locally

The North End, East End, Hyde Park, and the Boise Bench see the most of them because of the mix of finished or partially finished basements, original plumbing, and stored boxes that have sat untouched for years. We also see them in newer Meridian and Eagle builds when a master bathroom vent fan is undersized or rarely used. The dry Treasure Valley summer keeps overall silverfish pressure low, but the humid pockets under sinks, behind tubs, and in cool basements stay perfect for them year-round.

Our Solution

How We Handle Silverfish

What our approach looks like

Silverfish control comes down to two things: cutting the humidity and treating where they hide.

Our full approach

We apply residual products along baseboards and behind plumbing fixtures and walk the moisture sources with you. Because silverfish live for years and reproduce slowly, the population thins over weeks instead of overnight. New customers start at $49 for the first service.

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How to Prevent Silverfish

Steps you can take to reduce the risk of infestation

  1. Run a dehumidifier in basements and ground-floor bathrooms (silverfish drop off fast below 50% humidity)
  2. Fix drippy faucets, slow drains, and any leak under cabinets. That is the #1 source on most calls
  3. Store books, photos, and old paperwork in sealed plastic bins instead of cardboard
More prevention steps
  1. Vacuum baseboards, closet corners, and under furniture to pull out scales and eggs
  2. Seal cracks around tubs, sinks, and baseboards with caulk
  3. Run the bathroom fan during and after every shower, and crack a window if the basement smells musty

Silverfish Questions Answered

Common questions about identification, prevention, and treatment

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Why do I have silverfish?

Quick answerSilverfish thrive in humid spots with starchy food nearby, which is why bathrooms, basements, and stored boxes of paper or cardboard are the hot zones.

In Boise, an undersized bathroom fan, a slow leak under a sink, or an unfinished basement is almost always the trigger.

Are silverfish dangerous to my kids or pets?

Quick answerNo.

Silverfish don't bite, sting, or spread disease, so they're safe around children and pets. The real concern is the slow damage they cause to stored books, photos, and clothing, plus a possible allergy to their shed scales in a few sensitive people.

How long does it take to get rid of a silverfish problem?

Quick answerPlan on 4 to 8 weeks of steady improvement, not an overnight fix.

Silverfish live up to 8 years and reproduce slowly, so the population drops as adults die off and the eggs don't get replaced. Fixing the moisture source matters more than any spray. A working bathroom fan and a basement dehumidifier do most of the long-term work.

Think You Have Silverfish?

Call and we'll talk through your options. We usually get out within 24 to 48 hours.

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