silverfish insect

Silverfish Facts And Information


Have you ever stumbled upon a small, silver, scaly creature darting across your bathroom floor? If so, you’ve likely encountered a silverfish. These mysterious, unwanted house guests can be unsettling and frustrating to deal with. In this comprehensive guide, we’ll unravel the mystery of silverfish and provide you with everything you need to know about controlling and preventing infestations in your home.

What are Silverfish?

Appearance and Characteristics

silverfish insect

Silverfish are small, wingless insects named for their silver or grey appearance and fish-like movements. They are covered in scales and have three long, tail-like appendages. Adult silverfish typically measure between 12 and 19 millimetres in length.

Life Cycle

Silverfish have a unique life cycle, undergoing gradual metamorphosis. Their development consists of three stages: egg, nymph, and adult. Female silverfish lay their eggs in tiny crevices, and the nymphs that hatch from these eggs are smaller, white versions of the adults. As they grow, they moult and develop their characteristic silver colour.

Why Silverfish Are Pests?

Potential Damage

While silverfish are not harmful to humans, they can cause damage to your home and belongings. These insects feed on starchy materials, such as paper, cardboard, and wallpaper glue. They can also feast on clothing, carpets, and pantry items, resulting in noticeable damage over time.

Attraction to Damp Environments

Silverfish thrive in damp, humid environments, making your bathroom, kitchen, and basement prime real estate for these pests. Their preference for moisture is one of the reasons they can be so difficult to eradicate.

Where Do Silverfish Hide?

Common Hiding Spots

These nocturnal insects are masters of hiding. During the day, they seek refuge in dark, secluded areas, such as:

  • Behind wallpaper
  • In bookshelves
  • In storage boxes
  • Underneath sinks
  • In bathroom cabinets

Identifying Silverfish Infestations

A telltale sign of a silverfish infestation is the presence of small, irregular holes in paper products, clothing, or wallpaper. You may also notice yellowish stains, scales, or faeces near their hiding spots.

silverfish damage
Silverfish feeding on glue

Preventing Silverfish Infestations

Maintain Dry Conditions

One of the most effective ways to prevent silverfish infestations is by reducing the humidity levels in your home. Use a dehumidifier in damp areas like basements, bathrooms, and kitchens. Also, fix any leaks or plumbing issues that could contribute to excess moisture.

Properly Store Food and Paper Products

To discourage silverfish from feasting on your belongings, store food items, especially grains and cereals, in airtight containers. Keep books, magazines, and other paper products in dry, well-ventilated areas, and avoid storing them in damp spaces like basements or garages.

Seal Cracks and Crevices

Silverfish can enter your home through small cracks and crevices, so be sure to seal any gaps around windows, doors, and baseboards. Pay particular attention to areas where pipes and wiring enter your home, as these can provide easy access for silverfish.

Natural Silverfish Control Methods

Diatomaceous Earth

Diatomaceous earth (DE) is a natural, non-toxic powder that can be used to control silverfish. Made from the fossilised remains of microscopic aquatic organisms, DE works by damaging the exoskeletons of insects, causing them to dehydrate and die. Sprinkle DE around areas where you’ve spotted silverfish or in their hiding spots to deter these pests.

Essential Oils

Certain essential oils, such as lavender, eucalyptus, and peppermint, can act as natural repellents for silverfish. Mix a few drops of essential oil with water in a spray bottle and apply it to areas where silverfish are commonly found. Be sure to reapply the solution regularly for the best results.


You can create simple traps for silverfish using items you likely already have at home. One option is to wrap a glass jar with masking tape, making it easier for the insects to climb. Place a piece of bread inside the jar as bait, and the silverfish will be unable to escape once they’ve entered. You can also use sticky traps or commercially available silverfish traps to catch these pests.

Chemical Silverfish Control


In some cases, chemical insecticides may be necessary to control silverfish infestations. Products containing pyrethroids, such as permethrin or cypermethrin, can be effective against silverfish. Apply these insecticides as directed to cracks, crevices, and other hiding spots to eliminate these pests. Remember to always follow the label instructions and take proper safety precautions when using chemical treatments.

Safety Precautions

When using chemical insecticides, be sure to:

  • Wear gloves and a mask to protect yourself from exposure
  • Keep children and pets away from treated areas
  • Dispose of any contaminated items or materials according to local regulations

When to Call a Professional Silverfish Exterminator

If you’ve tried multiple methods to eliminate silverfish from your home and are still experiencing an infestation, it may be time to call in a professional exterminator. These experts have access to stronger treatments and can help identify the source of the problem to prevent future infestations.

Silverfish-Proofing Your Home for the Long Term

Once you’ve successfully eradicated silverfish from your home, it’s essential to take steps to prevent future infestations. In addition to the preventative measures mentioned earlier, consider:

  • Regularly inspecting your home for signs of silverfish activity
  • Staying vigilant about maintaining proper humidity levels
  • Periodically cleaning out
  • Periodically cleaning out clutter and disposing of old papers, books, and cardboard boxes that could attract silverfish

By taking these precautions and remaining proactive in your approach to silverfish control, you can help protect your home from these unwanted house guests in the long term.

In Summary

Silverfish can be a nuisance and cause damage to your home and belongings if left unchecked. Understanding their habits, preferences, and hiding spots is essential in effectively controlling and preventing infestations. By employing a combination of preventative measures, natural control methods, and, if necessary, chemical treatments, you can successfully rid your home of these mysterious insects and maintain a silverfish-free environment.

Silverfish Frequently Asked Questions

Q: What attracts silverfish to my home?

A: Silverfish are attracted to damp, humid environments and sources of food, such as paper, cardboard, and starchy materials. They may also enter your home through small cracks and crevices.

Q: Are silverfish harmful to humans?

A: While silverfish are not harmful to humans, they can cause damage to your home and belongings by feeding on starchy materials, paper, and textiles.

Q: Can silverfish infestations be prevented?

A: Yes, there are several steps you can take to prevent silverfish infestations, such as maintaining dry conditions, properly storing food and paper products, and sealing cracks and crevices.

Q: How can I naturally control silverfish?

A: Some natural control methods for silverfish include using diatomaceous earth, essential oils, and homemade traps.

Q: When should I call a professional exterminator for silverfish?

A: If you’ve tried multiple methods to eliminate silverfish from your home and are still experiencing an infestation, it’s time to call a professional exterminator. They can help identify the source of the problem and provide more effective treatments.

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