The answer to 'what causes silverfish' is that silverfish are attracted to and feed on carbohydrates, starches, and sugars. They are commonly found in damp areas of the home like bathrooms, basements, and kitchens where these food sources are present. Silverfish also thrive in areas with high humidity and moisture.
Silverfish get their name from their distinctive silver-grey color and fish-like movements. They have a flattened, elongated body with three long appendages at the rear. Silverfish are nocturnal and move quickly, making them difficult to spot. They reproduce quickly, with females laying up to 60 eggs at a time.