đ So, What Exactly Are Silverfish? Let’s Start with the Basics.
Silverfish (Lepisma saccharina) are not actually fish, nor are they insects that recently evolved. They are living fossils. They have been roaming the earth for over 400 million years, surviving the dinosaurs and ice ages alike.
What do they look like? They are small (about half an inch long), wingless, and have a distinct teardrop-shaped body. They are covered in metallic, silver-blue scales, have two long antennae at the front, and three distinct “bristles” at the back of their abdomen.
What do they eat? Their diet consists primarily of carbohydrates, especially sugars and starches. In nature, they eat decaying plant matter. In our homes, they are drawn to:
- Book bindings and paper (which contain starch and glue)
- Wallpaper paste
- Cotton, linen, and silk fabrics
- Human hair, dandruff, and dead skin cells
- Dust and dead insects
đ§ The “Sign” You Need to Know: Why Are They in Your Home?
The title of this article warns that finding a silverfish is a “sign” that you need to do something. But before you feel a wave of shame, let me be very clear: Finding a silverfish is NOT a sign that your house is dirty.
It is a sign that your house is damp.
Silverfish do not care about crumbs on the counter; they care about humidity. They thrive in environments with a moisture level between 75% and 95%. If you are seeing them, it is a gentle, biological indicator that a specific area of your home (like a basement, bathroom, or attic) is holding onto too much moisture.
They are simply looking for a cozy, humid environment and a little starchy snack. They are not a judgment on your housekeeping; they are just a weather vane for your home’s humidity levels.
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