Silverfish vs Firebrat

Silverfish vs Firebrat

Silverfish and Firebrats can be differentiated by several key characteristics.

Abdominal Appearance

  • Silverfish: Tapered abdomen that gives them a fish-like appearance.
  • Firebrat: Similar tapered abdomen, but may look more bristly or hairy.


  • Silverfish: Typically 12-19 mm in length.
  • Firebrat: Usually slightly larger, around 19-25 mm in length.


  • Silverfish: Generally silvery or metallic gray.
  • Firebrat: Mottled grayish-brown, often with darker markings.

Nesting Habitat

  • Silverfish: Prefer damp, cool places like basements, laundry rooms, and bathrooms.
  • Firebrat: Thrive in warmer environments, often found near ovens, boilers, and insulation.


  • Silverfish: Can live up to 8 years, with females laying fewer than 100 eggs in their lifetime.
  • Firebrat: May have a shorter lifespan but are more prolific breeders


  • Silverfish: Nocturnal and secretive, they are known to damage paper and clothing.
  • Firebrat: Also nocturnal and tend to move quickly when disturbed.