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February 6, 2023

A Closer Look at Silverfish and Cockroaches

A Closer Look with Brittany Campbell, Ph.D.

3 Silverfish facts you may not knowsilverfish.cockroach

They don’t have fighting skills

Silverfish have no defense against predators. That is why - to have survived all those millions of years - they developed extreme speed. Their speed helps them dart for cover.

Their intermittent fasting game is strong

Silverfish have a very unusual diet, consisting mainly of paper, glue, shaving cream, and other starchy substances like toothpaste, pasta, fabric, and cardboard. They will also eat dead insects. And they can live up to a year without food!

How they choose their housing

Silverfish love moisture, they need it to survive. You’ll find them in moist, humid areas with little foot traffic and lots of food sources.


Doxem Precise

5 Facts on the Cockroach

Tarsal structures help cockroaches climb vertical surfaces

The cockroach “foot” is an under-appreciated feature. Cockroaches have tiny pads with various features that create friction and force as they push and pull against a surface, allowing them to move vertically, up, down, and even upside-down. While many cockroach species have these structures, some do not. The ones that lack these features, like Oriental cockroaches, have inferior climbing abilities, especially on smooth surfaces.

Here’s why they’re major pests of public health importance


Because cockroaches are known to dwell, breed, and feed in highly unsanitary areas, they may expose humans to the pathogenic organisms they harbor and transport. Additionally, not only do they cause considerable psychological distress and embarrassment, but cockroaches are also a significant allergen source that can trigger asthmatic reactions for many people.


“Albino (white) cockroaches” won’t stay albino (white) for long

Have you ever a spotted white cockroach? No, that is not a new species. What you observed was a freshly molted cockroach! A white cockroach is in a fairly vulnerable state while waiting for its body to tan and harden. It can take some time, but the cuticle will gradually darken, and it will change into its standard color and form one would expect to see.

Hanging onto her egg case gives her offspring a better chance at survival

Some cockroach species deposit their oothecae quickly after it’s formed, while others, like the female German cockroach, will hold onto it while it’s developing. The benefit of carrying her egg case up until about a day or so before it hatches is to help protect the young cockroaches from parasitism, unfavorable conditions, or other factors that reduce survivorship.

Common cockroach names do not accurately inform native range or origin of the species

The American cockroach is not native to North America. As confusing as it is, it’s important to be aware that the scientific names (e.g. Periplaneta americana) were assigned to the species based on where they were collected at the time, not necessarily their confirmed place of origin.

Brittany Campbell, Ph.D., BCE

Technical Services Manager PCO Product Development

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