Silverfish in NYC Apartments: Why You Have Them and How to Get Rid of Them
Silverfish are one of the most common insects in New York City apartment buildings. They thrive in humid, book-filled, paper-rich environments — and eliminating them requires addressing the conditions that attract them.
What Are Silverfish?
Silverfish (Lepisma saccharinum) are wingless, carrot-shaped insects about half an inch to three-quarters of an inch long. They move in a distinctive fish-like wiggling motion — which is how they got their name. Their bodies are covered in silvery scales, and they have three long tail bristles at the posterior. They are fast, nocturnal, and capable of surviving for months without food.
They are not dangerous to humans. They do not bite, do not transmit disease, and are not structurally damaging like termites or carpenter ants. But they are genuinely destructive to certain belongings, and their presence indicates conditions in your apartment that are worth correcting.
Why NYC Apartments Are Ideal Silverfish Habitat
New York City's housing stock — particularly pre-war buildings throughout Manhattan, Brooklyn, and the Bronx — creates ideal silverfish conditions:
- Chronic humidity: Older buildings with cast-iron plumbing develop slow leaks and condensation that elevate bathroom and kitchen humidity to the 70–80% range that silverfish require
- Abundant cellulose food sources: Silverfish eat carbohydrates — specifically paper, cardboard, book bindings, wallpaper glue, linen, cotton, and certain food starches. NYC apartments full of books, stored cardboard boxes, and wallpapered walls are silverfish paradise
- Dark, undisturbed storage areas: Closets, behind bookshelves, inside wall voids, and above drop ceilings provide the protected, low-traffic areas silverfish prefer for harborage
- Year-round indoor temperatures: Unlike outdoor pests that die in winter, silverfish thrive in the consistent 65–80°F temperatures maintained in NYC apartments year-round
What Silverfish Damage
Silverfish cause genuine damage to:
- Books and documents: They feed on book bindings, paper pages, and glue, leaving small irregular holes and yellow staining across affected pages
- Wallpaper: They feed on the paste behind wallpaper in older apartments, causing paper to loosen and surface to show irregular holes
- Clothing and natural fibers: Linen, cotton, and silk garments stored long-term in closets are vulnerable, particularly if stored with cardboard or paper
- Stored food: Flour, cereals, rolled oats, and other dry goods in cardboard containers are accessible food sources
- Photos and artwork: Silverfish feed on photographic emulsion and certain adhesives used in matting and mounting
Signs of Silverfish Infestation
- Small, pepper-like droppings (round or slightly irregular) near bookshelves, in closets, and under sinks
- Yellow staining on paper, book pages, or fabric in stored areas
- Irregular feeding holes in paper products or fabric
- Shed scales (tiny, glistening specks) near harborage areas
- Sighting of live insects at night — most common in bathrooms and kitchens
How to Get Rid of Silverfish in Your NYC Apartment
Moisture control first: Silverfish cannot survive extended periods below 50% relative humidity. Run bathroom exhaust fans during and after every shower. Fix dripping pipes immediately. Consider a small dehumidifier for consistently humid areas.
Eliminate food sources: Move books and paper to sealed plastic bins or bookscases with doors. Store dry food in airtight containers. Remove cardboard boxes from closets.
Professional treatment: Insecticidal dust applied inside wall voids, along baseboards, and in closet corners provides long residual activity that surfaces sprays cannot match. Boric acid applied in appropriate areas kills silverfish on contact and through ingestion. Professional treatment typically produces noticeable reduction within two to three weeks.
Preventing Re-Infestation
In older NYC buildings where building infrastructure supports large silverfish populations, preventing re-infestation requires sealing the entry routes: caulking gaps around pipe penetrations under sinks, sealing the gap between the baseboard and floor, and blocking the entry points from shared wall voids. Annual or twice-yearly professional treatment maintains suppression in buildings where silverfish populations are established in shared infrastructure.
If silverfish are damaging your books, clothing, or belongings in your NYC apartment, call NYC Pest Control Near Me at (917) 203-6158. We serve apartments across Manhattan, Brooklyn, Queens, The Bronx, and Staten Island.