silverfish
silverfish

Months of Activity: January - December

Silverfish are elongated, flattened insects typically 13-25 millimetres long. They are active at night and hide during the day. When objects are moved where they are hiding, they dart out and seek new hiding places.

Appearance

Silverfish are born whitish, but develop a greyish hue and metallic shine as they get older. They have three long cerci at the tips of their abdomens, one parallel to their body, one facing left, and one facing right. They also have two small compound eyes.

Lifecycle

The female lays groups of less than fifty eggs at once, deposited in small crevices. The eggs are oval-shaped, whitish, about 0.8 millimetres long, and take between two weeks and two months to hatch. Silverfish usually lay fewer than one hundred eggs in their lifetime.

When the nymphs hatch, they are whitish in colour, and look like smaller adults. As they moult, young silverfish develop a greyish appearance and a metallic shine, eventually becoming adults after three months to three years. They may go through seventeen to sixty-six moults in their lifetime, sometimes thirty in a single year, which is much more than usual for an insect.

Silverfish page content courtesy of Pest Control UK

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