What Are Silverfish?

Silverfish (Lepisma saccharina) are small, wingless insects with a distinctive silver-grey colour and fish-like wriggling movement. They're one of the oldest insect species on earth, having been around for over 400 million years, and are remarkably resilient. Despite their primitive nature, they can cause surprisingly significant damage to household items — and their ability to go undetected for long periods means infestations often become well established before homeowners notice them.

Why Silverfish Love Gold Coast Homes

The Gold Coast's humidity is the primary reason silverfish are so common in local homes. Silverfish thrive in environments with relative humidity above 75%, which is common in Gold Coast homes — particularly in coastal suburbs like Broadbeach, Mermaid Beach, and Palm Beach where sea air keeps moisture levels elevated year-round.

Beyond humidity, silverfish are attracted to their food sources: carbohydrates and proteins found in paper, glue, fabric, and food residue.

Where Silverfish Hide in Your Home

Silverfish are nocturnal and avoid light, which is why many homeowners don't realise they have an infestation until damage is already visible. Common hiding spots include:

• Bathrooms and laundries — particularly under baths and behind toilets
• Kitchen pantries and behind appliances
• Roof voids and subfloors
• Bookshelves and archives
• Wardrobes and linen storage areas
• Wall voids near plumbing
• Cardboard boxes in storage areas and garages

What Silverfish Feed On

Silverfish are polyphagous — they eat a remarkably wide range of materials:

• Paper and books: They consume the starch in paper, leaving irregular holes and yellowing
• Glue and adhesives: Book bindings, wallpaper paste, and envelope glue are all targets
• Natural fabrics: Cotton, silk, linen, and wool clothing
• Stored food: Flour, oats, cereals, and dried pasta in unsealed containers
• Leather and photographs: The proteins in leather and photo emulsions are attractive to silverfish
• Dead insects: Including their own shed skins

Signs of a Silverfish Infestation

Because silverfish are nocturnal and hide effectively, look for evidence of their activity rather than the insects themselves:

• Irregular holes and notches in paper, books, and wallpaper
• Yellow staining on paper and fabric
• Small pepper-like droppings on shelves and in drawers
• Shed skins — tiny, translucent, and fish-shaped
• Damage to clothing — small irregular holes in natural fabrics in wardrobes
• Silverfish sightings — usually triggered when disturbing stored items

Silverfish Prevention

Reduce Humidity

Since humidity drives silverfish activity, reducing moisture levels is the most effective long-term prevention strategy. Use exhaust fans in bathrooms and laundries, fix leaking taps and pipes promptly, improve subfloor ventilation if your home has a crawl space, use a dehumidifier in persistently damp areas, and ensure adequate roof void ventilation.

Protect Food and Paper Sources

• Store cereals, flour, and dried goods in sealed containers
• Keep books in sealed storage or well-ventilated bookcases
• Store important documents in sealed plastic sleeves or boxes
• Use plastic storage containers instead of cardboard boxes
• Reduce paper clutter — old newspapers and magazines are ideal silverfish habitat

Reduce Harboring Areas

• Declutter storage areas, garages, and roof spaces
• Elevate stored items off the floor
• Seal cracks in walls and around plumbing
• Repair damaged or damp plasterboard promptly

Professional Silverfish Treatment

For established infestations, professional treatment is far more effective than over-the-counter products. Professional silverfish control includes targeted dust treatments in roof voids, wall cavities, and subfloor areas, residual spray treatment of harboring areas, inspection and identification of moisture sources contributing to the infestation, and advice on structural improvements that reduce silverfish risk.

Because silverfish breed slowly and live for 2–8 years, they can maintain a low-level presence for extended periods. Professional treatment combined with humidity reduction and source removal provides the most complete and lasting result.

If you're finding damage to books, clothing, or wallpaper in your Gold Coast home, don't dismiss it — silverfish infestations left untreated can cause irreplaceable damage to valuable items over time. Contact us for a professional assessment.