Silverfish in South Florida

Silverfish are small, wingless, silvery insects with three tail-like bristles that live in damp, dark places and feed on paper, glue, starch and stored food. South Florida's high humidity makes bathrooms, closets, attics, garages and bookshelves ideal for them, and their close relative, the firebrat, does the same in hot spots like water heater closets and laundry rooms.

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What Are Silverfish?

Silverfish are primitive, wingless insects in the order Zygentoma. The common silverfish, Lepisma saccharina, gets its name from the tiny, glistening scales that cover its body and its slender, fish-like shape. Its close relative, the firebrat (Thermobia domestica), looks almost the same but prefers much hotter places. Both are common in homes, especially where humidity is high and air moves little.

That describes many South Florida homes for much of the year. The long, humid rainy season from May through October, bathrooms without strong exhaust fans, closets packed against exterior walls, garages, storage rooms and attics give silverfish the moisture they need. Homes with plumbing leaks, roof leaks after storms or poor ventilation are especially at risk, and so are older homes and buildings with years of stored books, papers and boxes. Condos and high-rises are not immune either, since silverfish can hide in wall voids, closets and storage units and can arrive in cardboard boxes, furniture and building materials.

Silverfish are nocturnal and rarely seen in the daytime unless they are disturbed. Many homeowners only notice them when one runs across the bathroom floor at night, turns up trapped in a sink or bathtub, or when they find holes in old books or important papers.

How to Identify Silverfish

• Body: long, flat and tapered, like a teardrop or a fish, about 1/3 to 1/2 inch long. Silverfish can reach 3/4 inch.
• Color: silverfish are shiny silver or pearl-gray; firebrats are mottled gray or brown.
• Antennae: two long, thread-like antennae.
• Tail: three long, bristle-like appendages at the rear. On the silverfish, one points straight back and the other two curve out to the sides.
• No wings: they run quickly but cannot fly.
• Young: immature silverfish look like small, pale adults.

Silverfish or termites? Because silverfish damage paper, cardboard and other cellulose products, some homeowners worry they have termites. The three-part tail, the silvery scales and the fast run make silverfish easy to recognize. If you find damaged wood, mud tubes on walls or small piles of pellets that look like sand or coffee grounds, those point to termites instead, and they need a termite inspection.

Silverfish vs. Firebrats

Life Cycle and Behavior

Silverfish do not go through a dramatic transformation like butterflies or beetles. The young hatch looking like small adults and simply grow, molting many times along the way. Unlike most insects, they keep molting after they become adults; UF/IFAS reports that a silverfish can molt 25 to 66 times in its lifetime.

Eggs are laid in small clutches in cracks and crevices. According to University of California IPM specialists, silverfish eggs take about 19 to 32 days to hatch and firebrat eggs about 14 days. Development is slow and depends on temperature: above 75°F, silverfish can mature in as little as 60 days, while in cooler conditions it can take much longer. UF/IFAS notes that development from egg to adult typically takes about a year, and that silverfish may live up to four years under good conditions. Because they live so long and can survive for several months without food, a small population can quietly build up behind books, boxes and baseboards.

Silverfish and firebrats feed at night. They prefer starchy materials, especially glazed paper, but also eat sugars, cellulose, fabrics, glue from wallpaper and book bindings, dry foods such as cereal, flour and pasta, pet food, dust, dead insects and certain molds. They scrape at surfaces rather than biting cleanly, which leaves the irregular, ragged damage typical of silverfish.

Signs of a Silverfish Problem

• Silverfish running for cover when you turn on a light at night.
• Silverfish trapped in sinks, bathtubs or shower pans, where they go looking for moisture.
• Irregular, unconnected holes or scraped areas on book pages, covers, envelopes, documents and wallpaper.
• Damage to boxes, photographs, stored papers and starched clothing or linens.
• Small spots of droppings near damaged items.
• Tiny, delicate, dust-like scales that shine slightly in the light, on shelves or stored items.
• Dark brown spots on damp paper, caused by fungi that grow where silverfish feed.

Why Silverfish Are a Problem

Silverfish and firebrats are considered household pests because of what they eat. UF/IFAS calls the silverfish a voracious feeder on materials rich in starch, glue and cellulose, which is why it is a well-known pest in libraries and museums. In a home or office, that means old books, family photos, important documents, wallpaper, cardboard boxes, starched linens and some fabrics can be damaged, and dry foods in the pantry can be contaminated.

The damage is usually slow, which is what makes silverfish costly. Collections stored in a closet, garage or attic for years can be ruined before anyone notices. For property managers, offices, schools, archives and other commercial properties that store paper records, silverfish can be a real concern. Their presence is also a useful warning sign: because silverfish need a lot of moisture, a large population often points to a humidity, leak or ventilation problem, and moisture also attracts other pests, such as cockroaches.

Where Silverfish Hide in South Florida Homes and Businesses

• Bathrooms: under sinks and vanities, behind toilets, around tubs and in gaps around pipes.
• Laundry rooms and kitchens: behind washers and dryers, under sinks and in pantries with cereal, flour, pasta or pet food.
• Closets and bookcases: among stored books, magazines, papers, shoe boxes and starched clothing.
• Attics and storage rooms: in boxes and other stored items.
• Garages: in cardboard boxes and stored papers.
• Behind baseboards and moldings: and around window and door frames.
• Wall voids: in hollow walls and decorative beams.
• Water heater closets and utility rooms: firebrats in particular favor the heat around water heaters and hot water pipes.

When Silverfish Are Most Active in South Florida

How to Prevent Silverfish

• Lower humidity. Use dehumidifiers in closed spaces and ventilation or exhaust fans in bathrooms and laundry rooms. Silverfish require a lot of moisture.
• Fix leaks. Repair dripping pipes and faucets, roof leaks and AC drain problems, and dry wet areas quickly.
• Store paper the right way. Keep old books, papers, photos, starched linens and cardboard in sealed plastic containers instead of open boxes, and move and check book collections from time to time.
• Reduce clutter. Recycle old newspapers, magazines and cardboard boxes that provide food and hiding places.
• Seal food. Keep cereal, flour, pasta and pet food in containers with tight lids.
• Seal cracks. Caulk gaps around plumbing, wall moldings, baseboards, windows and door frames.
• Vacuum regularly. Vacuum shelves, closets and baseboards to remove silverfish, eggs, scales and crumbs.
• Check what comes in. Inspect used furniture, boxes and stored items before bringing them into the house.
• Cool hot spots. For firebrats, improve air circulation around water heaters, hot water pipes and dryers.

How Toro Gets Rid of Silverfish

1. InspectionA Toro technician inspects bathrooms, closets, bookcases, attics, garages and utility areas to find where silverfish or firebrats are hiding and what moisture, leak or storage problems are attracting them.
2. IdentificationWe confirm whether you have silverfish or firebrats, because they favor different parts of the home, from damp bathrooms to hot water heater closets.
3. Targeted treatmentWe treat cracks, crevices, baseboards, wall voids and attic areas where they live and breed, using products chosen for the situation and applied according to their label directions, and recommend moisture and storage changes that make the home less attractive to them.
4. Follow-upWe check results and treat any areas where activity continues. Our 110% Satisfaction Guarantee means that if the bugs come back, so will Toro, at no additional cost to you.

From older homes in Coral Gables and Miami to condos in Miami Beach and homes in Key West, Toro has helped South Florida families protect their homes since 1969. We respond within 24 hours, guaranteed. Call 305-594-4767 for a free inspection and $25 off your first service. Hablamos Español.

Silverfish: Frequently Asked Questions

Related Pests

• Cockroaches
• Termites
• Spiders
• Ants
• Bed Bugs

Pest Control Across South Florida

Toro treats silverfish in homes and businesses throughout Miami-Dade, Broward and Palm Beach counties, including:

• Miami
• Hialeah
• Doral
• Miami Beach
• Coral Gables
• Homestead
• Fort Lauderdale
• Hollywood
• Pembroke Pines
• Miramar
• Boca Raton
• West Palm Beach

Last updated: October 29, 2026