Identification
| Trait | Detail |
|---|---|
| Shape | Carrot-like taper; wingless; metallic sheen of scales. |
| Size | Commonly about 12–19 mm including tail filaments. |
| Tails | Three long cerci/tail threads off rear—distinctive at a glance. |
| Movement | Fast, fish-like wriggle when exposed to light. |
| Colour | Silvery grey to brownish after scale rub. |
| Confusion | Firebrats prefer hotter areas; booklice are much smaller and softer. |
Silverfish (Lepisma saccharinum) are ancient insects that favor damp, still air. In Greater Vancouver they thrive in bathrooms with slow-drying grout, laundry rooms with vent issues, and basements with cardboard on concrete. They eat materials with starch or polysaccharides—book glue, wallpaper paste, some fabrics with sizing, and crumbs.
Behaviour & Habits
Nocturnal hiding in cracks, behind baseboards, under bath mats, and inside corrugated cardboard. They can survive months without food if humidity holds. Activity persists year-round indoors where heat and moisture intersect. Heavy populations suggest chronic humidity or hidden leaks rather than “random bugs.”
Health & Property Risks
⚠ Health risk — professional removal recommended. Silverfish are not biters of humans; risk is property damage to valued books and textiles and tenant perception in rentals.
Damage appears as notched paper edges, missing wallpaper patches, and irregular holes in stored natural fabrics when sizing is present.
Prevention
- Run bath fans; fix slow leaks under sinks and behind tubs.
- Use dehumidifiers in musty basements when practical.
- Store books and documents off slab on shelving; use bins with tight lids.
- Recycle long-term cardboard; avoid garage wall stacks touching drywall.
- Seal expansion cracks along tub surrounds after professional assessment.
How We Treat Silverfish
We inspect humidity drivers, then apply crack-and-void treatments along baseboards, cabinet voids, and attic hatches when activity tracks there. Follow-up checks the same corners with sticky monitors or visual counts. Heavy moisture still needs plumbing fixes—pesticides do not dry wet walls.
See silverfish control service for Greater Vancouver.
Frequently Asked Questions Q: Do they bite?
A: Not people; they scrape starchy materials.
Q: New house—why silverfish?
A: Construction moisture and stored boxes can spike early counts.
Q: Cats eat them?
A: Sometimes; not a reliable control strategy.
Q: Essential oils?
A: Not a substitute for moisture control and targeted treatment.
Q: Strata hall closets?
A: Shared damp mop closets can seed multiple suites—coordinate cleaning.
Q: Attics?
A: If insulation harbors them, inspection maps whether treatment or insulation work fits.
Professional Silverfish Control
Silverfish problems in Greater Vancouver require a systematic approach — inspection of the full property, elimination of the root cause, and documented follow-up. Our silverfish control service covers all of this.
View Silverfish Control