7 Interesting and Helpful Facts About Silverfish

Posted by Mark A. Puglisi, ACE on Thu, Nov 15, 2018 @ 07:19 AM

7 Interesting and Helpful Facts About Silverfish

jarsWhat is that creepy-looking metallic gray bug with a bunch of antennae and legs, and why is it shimmying up the wall? It's most likely a silverfish, so named because of its silvery sheen and its rapid movements, which resemble the undulations of a swimming fish. Here are seven more interesting facts about silverfish.


  1. Silverfish Are Old-School Bugs

The first ancestors of silverfish are some of the most primitive insects known to science. Silverfish evolved no later than the mid-Devonian period, over 350 million years ago.

Silverfish —along with bugs like jumping bristletails — developed before winged insects. None of the 600 species of silverfish have wings to this day.


  1. Silverfish Never Really Grow Up

Silverfish never reach a defined adult form, which is another trait of primitive bugs. The insects can reproduce by the time they shed their skin, or molt, nine times, so they definitely have mature bug capabilities.

However, silverfish will molt throughout their lives and never develop a permanent exoskeleton. Since silverfish live for two to eight years, that adds up to as many as 50 molts throughout their lives. Young silverfish appear whitish, while subsequent molts reveal the silvery sheen that gives the bugs their name.


  1. Silverfish Eat Paste                                      

Silverfish are not picky eaters. They adore the dextrin and starches found in glue and dried wallpaper paste.

Other foods enjoyed by silverfish include:

  • Coffee
  • Hair
  • Cereal boxes and cereal
  • Dandruff and dead skin
  • Plaster
  • Sugar, rice, pasta, and flour
  • Linen and cotton

Often, the first sign of a silverfish infestation is holes and yellow stains in books and on paper products. Silverfish will even chew on photographs.

Thankfully, silverfish don't chew on humans or pets. They aren't biters and aren't known to carry diseases. Silverfish do have an amazing ability to live up to a year without food, as long as water is available.


  1. Silverfish Love to Come Out at Night

Household varieties of silverfish are nocturnal creatures. You may find holes in your favorite novels and suspect a silverfish invasion yet never see a single silverfish. The bugs are adept at hiding from view in damp, dark spaces around your home.

Hunt for a silverfish infestation in or under:

  • Sinks
  • Cabinets
  • Closets
  • Bathrooms and kitchens
  • Wall cracks and crevices
  • Boxes and bags

An additional sign of a silverfish infestation is their tiny droppings, which look like small black pepper flakes. You may also find exoskeletons that the silverfish have shed near their living spaces. The exoskeletons are transparent after being shed.


  1. Silverfish Engage in Ritual Reproduction

Silverfish don't reproduce via internal fertilization as many other insects do. Instead, the male and female perform an intricate mating ritual to produce their offspring externally. Their reproductive routine can last up to half an hour.

First, the silverfish couple face each other and touch their antennae together. Their antennae tremble and quiver as they back away from each other and then return to touching one another. Eventually, the male takes off and the female pursues him.

Once the female catches the male, the pair stand beside each other head to tail as the male's tail vibrates against the female. He finally lays a capsule of sperm called a spermatophore. The female sits on the capsule and takes the spermatophore up into her ovipositor to fertilize her eggs.


  1. Silverfish Are Relatively Easy to Eradicate

You can get rid of silverfish by performing the same housekeeping tasks used to eradicate other bugs. Keep your home clean and clutter-free. Seal up food containers. Store grains and cereals in jars with lids.

You should also:

  • Remove damp areas from your home.
  • Seal up cracks and crevices inside and out.
  • Keep pet food sealed in containers.
  • Use lavender or cedar in linen storage.
  • Repair damp or peeling wallpaper.
  • Avoid storing books and clothes in cardboard.

Periodically deep clean your cabinets and bookshelves. Spilled noodles and oatmeal attract silverfish, so promptly clean up spills and crumbs to remove these tempting silverfish meals. Do the same deep clean of your bookshelves every month or so. Remove books, dust the shelves, and inspect materials for signs of infestation.


  1. Silverfish Are Managed With Professional Pest Control

Your pest control professional has a variety of methods to remove silverfish from your home. The techs may use a variety of pesticides, pest deterrents, and traps to repel, catch, and kill the silverfish invading your home.

The precise pest-control measures used in your home will be based on your preferences and the presence of children and pets in the home. Bait traps and some applied chemical pesticides are best used in areas where no kids or pets have access.

Materials including boric acid, diatomaceous earth, and pyrethrin-based pesticides are all used to combat silverfish infestations. To learn more about ridding your home of silverfish in Los Angeles, California, contact Greenleaf Organic Pest Management, Inc., today.

Tags: indoor pest, pest control food safety