Silverfish Identification
Lepisma saccharina
Silverfish are primitive, moisture-loving insects that damage paper, packaging, and dried goods in cool, humid storage environments. They are not grain feeders, but they are a common facility invader and a reliable indicator of excess moisture.
Quick Identification
- Silver-gray with a metallic sheen
- Carrot- or teardrop-shaped, tapering body
- Three long tail filaments and two antennae
- Wingless; fast, wriggling movement
- Adults roughly 12-19 mm long
Where We See It
- Storage rooms and basements
- Paper, cardboard, and packaging storage
- Damp wall voids and areas around plumbing
- Cool, humid, low-traffic spaces
Life Cycle
- Eggs laid in cracks and crevices
- Slow development; favored by humidity above ~75% RH
- Long-lived and can survive long periods without food
- Thrives in cool to moderate temperatures
Why It Matters
- Damages paper, labels, packaging, and dried goods
- Contaminates product and signals moisture problems
- Long lifespan creates persistent, hidden populations
Monitoring & Control
Moisture and humidity control is the foundation – fix leaks, improve airflow, and reduce condensation. Sanitation, removing cardboard harborage, and targeted crack-and-crevice treatment manage persistent activity.
Need Help Identifying This Pest?
FSS stored product entomologists can confirm identification through photo review or laboratory analysis, then recommend a facility-specific plan.