Silverfish
Lepisma saccharinum · Occasional Invader
Lepisma saccharinum
Occasional Invader
1/2 to 3/4 inch
Silver-gray, scaled, teardrop shape with 3 long tail filaments
2 to 8 years
About the Silverfish
Silverfish are fast-moving nocturnal insects that feed on starches, sugars, paper, glue, book bindings, wallpaper paste, and textiles containing natural fibers. Silverfish thrive in humid, dark locations and can survive without food for months. They do not bite or transmit disease, but they damage paper, books, photographs, stored clothing, and wallpaper.
Habits & Behavior
Silverfish live in basements, bathrooms, attics, kitchen cabinets, and stored boxes. They prefer 75 to 95 percent humidity and dark undisturbed locations. They feed on book bindings, wallpaper paste, dead skin cells, dried pet food, cereal crumbs, starched fabrics, and stored photographs.
Signs of a Silverfish Infestation
Silver-gray fast-moving insects fleeing when storage boxes, books, or closets are disturbed
Irregular holes or surface etching in wallpaper, book pages, cardboard, stored fabric
Yellow staining on paper and fabric from silverfish fluids
Tiny pepper-like droppings near feeding sites
Shed exoskeletons in undisturbed storage areas
Silverfish Pressure in Michigan
Silverfish populations are stable year-round in Michigan. Older homes with humid basements, poorly ventilated bathrooms, and stored paper archives (books, photos, documents, cardboard boxes) see the heaviest populations. Lakefront properties and homes without basement dehumidifiers are particularly susceptible.
How BTR Treats Silverfish Infestations
BTR uses residual dust applications in wall voids, baseboards, and crawlspaces combined with crack-and-crevice sprays in bathrooms, basements, and kitchen cabinets. Pheromone traps monitor population reduction. Most silverfish treatments clear in 2 to 3 visits.
Prevention Tips
Run a basement dehumidifier year-round (target 40 to 50 percent humidity). Improve bathroom ventilation with exhaust fans. Store books, documents, and photos in sealed plastic containers. Declutter basements, attics, and storage rooms. Repair leaking plumbing immediately.
Frequently Asked Questions About Silverfishs
Do silverfish bite?
No. Silverfish cannot bite humans. They have small mouthparts adapted only for scraping starches from paper, glue, and similar materials. They are harmless to people and pets.
Why are silverfish in my bathroom?
Silverfish require high humidity. Bathrooms with poor ventilation, standing water, leaking plumbing, or damp cabinets create ideal silverfish habitat. Improving ventilation and fixing leaks eliminates the conducive conditions.
Can silverfish damage my house?
Silverfish cause minor aesthetic damage to wallpaper, book covers, photographs, stored clothing, and cardboard. They do not damage wood, drywall, or structural materials. Large populations can ruin stored paper archives and textiles.
How do I get rid of silverfish without chemicals?
Reduce basement and bathroom humidity to below 50 percent. Vacuum thoroughly in closets, pantries, and under appliances. Store books and fabrics in sealed plastic containers. Most silverfish populations shrink dramatically when humidity drops. Severe infestations may still require professional treatment.
How long does silverfish treatment take?
Most Metro Detroit silverfish treatments clear in 2 to 3 visits across 6 weeks. Residual dust applications maintain protection for several months. Humidity control is essential for long-term elimination.
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