Silverfish prefer dark, humid environments, which is why they are commonly found in bathrooms, kitchens, basements, laundry rooms, and around leaking pipes. Moisture is one of the biggest factors allowing them to survive indoors. They feed on materials containing starches and carbohydrates, including paper, cardboard, wallpaper glue, book bindings, and food debris.
Finding a single silverfish doesn’t necessarily mean there is an infestation. However, repeated sightings, shed skins, or small areas of damage to paper and other stored materials can suggest that more are hiding nearby. Because they often remain inside cracks, cabinets, and other dark spaces during the day, a larger population may not always be immediately visible.
Reducing moisture is one of the most effective ways to make a home less attractive to silverfish. Repair leaking pipes, improve ventilation, reduce excessive humidity, remove unnecessary cardboard and paper clutter, and consider using a dehumidifier in persistently damp areas. Silverfish are generally more of a household nuisance and possible warning sign of excess moisture than a danger to people.
