Silverfish in Bathroom: Quick Tips for Prevention & Removal

folder_openInsecta, Zygentoma
comment6 Comments

Silverfish can be a common yet unwelcome sight in your bathroom. These small, silver-colored insects may not be harmful to humans, but they can be quite a nuisance, causing damage to your belongings and leaving behind a mess. In this article, we’ll explore everything you need to know about silverfish in your bathroom, from how they got there to effective ways to prevent and control their presence.

You might be wondering why silverfish are so drawn to your bathroom. The answer lies in their preference for a moist environment. Bathrooms can provide an ideal spot for these pests due to their high humidity levels and the availability of water sources. Additionally, household items commonly stored in bathrooms, such as cardboard or paper products, can serve as food sources for silverfish.

Now that you know why silverfish are attracted to your bathroom, it’s time to learn how to keep them at bay. Prevention and control measures include reducing humidity levels and eliminating potential food sources. Stay tuned for more information on how to maintain a silverfish-free bathroom.

What are Silverfish?

Silverfish are small, wingless insects known for their silvery scales and elongated, oval-shaped bodies. They have long antennae and three distinctive tail-like appendages, which give them a fish-like appearance1. These insects belong to the order Zygentoma, previously known as Thysanura, and are often mistaken for their close relatives, firebrats2.

You might find silverfish in your bathroom because they thrive in environments with high humidity levels3. Their preference for moist areas makes bathrooms an ideal habitat. As nocturnal insects, you may not notice them during the day, but they could be lurking in dark corners or under sinks.

Some characteristics of silverfish include:

  • Soft, flat bodies with a length of up to 3/4 inch1
  • Covered with fine, silvery to brown scales1
  • Long, threadlike antennae3
  • Three long, thin tail-like appendages3

In comparison, their relatives, firebrats, are quite similar in appearance and habits. However, firebrats, or Thermobia domestica, prefer warmer environments and are generally found near sources of heat4.

Notorious for their damage to homes, silverfish and firebrats thrive on carbohydrates, such as glue, book bindings, and wallpaper paste, as well as protein-rich materials like cotton and linen5. Keep an eye out for these insects and take preventive measures to ensure your bathroom remains a safe and comfortable space.

Why are Silverfish in the Bathroom?

Silverfish are attracted to your bathroom mainly due to humidity and moist conditions. Bathrooms provide an ideal environment for these pests, as they thrive in damp and humid areas.

The abundance of moisture in bathrooms comes from various sources such as sinks, bathtubs, and pipes. Silverfish can easily find water to survive, and high humidity levels allow them to feed and reproduce. Additionally, bathrooms often have cracks and crevices where these insects can hide, lay eggs, and seek shelter1.

Another reason silverfish may be found in your bathroom is the presence of various items that they can feed on. While they prefer materials of plant origin that are high in carbohydrates and protein, they may also feed on items commonly found in bathrooms such as paper, glue in book bindings, and even damp fabric2.

To prevent silverfish infestations in your bathroom, try to keep the humidity levels low by using exhaust fans and fixing any leaky pipes or faucets. Regularly clean and seal cracks and crevices to eliminate their hiding places.

Signs of a Silverfish Infestation

Having silverfish in your bathroom can be both annoying and a sign of a more significant issue. Here are some signs to help you identify a silverfish infestation:

Small Yellow Stains

Keep an eye out for small yellow stains on your bathroom walls, floors, or even your towels. These stains can be an indication of silverfish eggs. The stains could also be from silverfish feces, which means that they are likely already active in your bathroom.


Silverfish leave behind small, dark, and pellet-shaped feces. If you notice these in the bathroom, it’s a clear sign that silverfish are present. Be sure to check corners, cracks, and crevices around your bathroom for any evidence of fecal matter.

Dead Insects

Look for dead silverfish or other insects in your bathroom. The presence of dead insects could mean that silverfish are feeding on them, which is a sign of a more extensive infestation.

Movement in Damp Areas

Silverfish thrive in damp environments. If you notice any movement in areas around your bathroom sink, toilet, or bathtub, this could be a sign of silverfish activity.

As a friendly reminder, maintaining a clean and well-ventilated bathroom is essential in preventing silverfish infestations. Make sure to address any moisture-related issues and seal up any cracks or crevices to discourage these pests from moving in.

The Damage Caused by Silverfish

Silverfish are notorious for causing damage to various household items. They are especially attracted to materials containing carbohydrates and protein.

For instance, your beloved books and wallpapers are not safe from these tiny creatures. Silverfish feed on the glue that binds these items together, slowly deteriorating their integrity. Additionally, carpets and curtains made up of fabrics like silk can also fall victim to silverfish infestations.

You may be surprised to learn that silverfish can even damage pantry items. They feed on flour, dried meat, and cereals, nibbling away and contaminating your food supply.

In summary, silverfish can cause harm to various household items. Be vigilant and take proper measures to protect your belongings from these pesky insects.

Please note: The provided search results in the instructions are insufficient for linking to specific information regarding the damage caused by silverfish. It’s recommended to follow up online for more details on the specific damages mentioned.

Preventive Measures Against Silverfish

To prevent silverfish in your bathroom, it’s essential to control moisture levels. Consider using a dehumidifier or installing ventilation systems, such as windows or bathroom fans, to reduce humidity.

Seal any cracks or gaps in your bathroom walls with caulking. This helps prevent silverfish from entering your bathroom and nesting in those spaces.

Take care of areas like basements too, as they often have a higher humidity level, attracting silverfish. Investing in a good dehumidifier or installing ventilation in those areas can help keep silverfish away.

Store your bathroom items in airtight containers. This helps protect them from silverfish and makes it less attractive for these pests to invade your bathroom.

If you don’t have a bathroom fan, consider installing one. It helps to circulate air, reduce moisture, and make the bathroom less suitable for silverfish.

Keep your bathroom free from clutter and regularly check for, and address, any water leaks. Clutter provides hiding spots for silverfish, while water leaks increase moisture levels in your bathroom.

In summary, focus on moisture control and reduce hiding spots for silverfish in your bathroom by following the steps mentioned above. With a little attention to these preventive measures, you can create an inhospitable environment for silverfish and keep your bathroom free from these unwanted pests.

Natural Methods to Get Rid of Silverfish

Silverfish can be a nuisance in your bathroom. Don’t worry, there are natural methods to help keep them away.

Essential oils are a great option. For example, cinnamon and cedarwood oils can be used to repel silverfish. Simply mix a few drops with water in a spray bottle, and spray it around the bathroom.

Here are some other helpful tips:

  • Place bay leaves in corners and cabinets, as silverfish dislike their scent.
  • Use cedarwood products like hangers or shavings, since cedarwood repels many pests.

Remember, keeping a clean and clutter-free bathroom will also help keep your bathroom silverfish-free. Good luck!

Chemical Methods to Eliminate Silverfish

To effectively get rid of silverfish from your bathroom, you can consider using chemical methods. One option is boric acid. When silverfish come into contact with boric acid, it damages their exoskeleton and eventually kills them1. To use this, simply sprinkle the powder in areas where you have seen silverfish.

Another option is diatomaceous earth. Just like boric acid, diatomaceous earth damages the insects’ exoskeleton2 when they come into contact with it. When using this powder, apply it around the edges of your bathroom and other spots where silverfish may be hiding.

You can also use chemical insecticides that are specifically designed to eliminate silverfish. Most of these insecticides contain synthetic pyrethroids3. Apply these in areas with silverfish activity, but read the labels and follow the instructions as safety precautions vary by product.

Silverfish traps can be set up in your bathroom as well. These traps often use sticky glue to capture the insects. Place them in corners, under sinks, and near bathroom cabinets to target the silverfish where they usually hide.

Here’s a quick comparison table of these chemical methods:

Method Pros Cons
Boric acid Easy to use; inexpensive Can harm pets if ingested
Diatomaceous earth Natural; safe for humans and pets May take longer to see results
Chemical insecticides Fast-acting Could be harmful to humans, pets, and the environment
Silverfish traps No chemicals used; easy to monitor May capture non-target species

In conclusion, these chemical methods can help you get rid of silverfish in your bathroom. Remember to be cautious when using chemicals and always read the labels for proper usage instructions. Keep your bathroom clean, dry, and well-ventilated to prevent future infestations.

Professional Pest Control for Silverfish

When dealing with a silverfish infestation in your bathroom, it’s crucial to consider professional pest control. These experts have the necessary experience and tools to get rid of pesky silverfish effectively.

Hiring a professional pest control service will ensure that your bathroom remains free from these insects in the long run. A few advantages of using professional pest control for eliminating silverfish are:

  • Efficient treatment: Professionals can quickly identify the severity of the infestation and devise a customized plan for your specific situation.
  • Safety: They use environmentally friendly and safe methods that won’t harm you, your family, or pets.

However, there are also some drawbacks to professional pest control, such including:

  • Cost: It can be more expensive than DIY methods.

In conclusion, when deciding whether to use a professional pest control service to eliminate silverfish, consider the benefits and drawbacks. It’s essential to choose the option that best suits your needs and budget.


In conclusion, dealing with silverfish in your bathroom can be an annoying task. However, by understanding these pests and their behavior, you can effectively prevent their infestation. Remember, silverfish thrive in humid and dark environments, so try your best to keep your bathroom well-ventilated and lit.

For instance, using a dehumidifier can help reduce humidity in the bathroom. Regularly cleaning and decluttering your bathroom also minimizes potential hiding spots for these pests.

To summarize the key points:

  • Silverfish are pests that thrive in humid, dark environments.
  • Prevent infestations by controlling humidity and keeping the bathroom clean.
  • Getting rid of hiding spots by decluttering reduces their chance to grow in numbers.

By following these tips, you can maintain a silverfish-free bathroom and enjoy a more pleasant environment in your home.


  1. Silverfish – Texas A&M University 2 3 4 5
  2. Silverfish and Firebrats | University of Maryland Extension 2 3
  3. Silverfish and Firebrat – Plant & Pest Diagnostics 2 3 4
  4. Silverfish and Firebrats | Ohioline – Ohio State University
  5. Silverfish and Firebrats | NC State Extension Publications

Reader Emails

Over the years, our website, has received hundreds of letters and some interesting images asking us about these insects. Scroll down to have a look at some of them.

Letter 1 – Silverfish

My Roomates
Location: Nova Scotia, Canada
December 18, 2010 10:00 am
shortly after I moved in I began seeing these guys around my apartment, I’ve seen them in the light shades on the ceiing, the bathtub, dresser drawers and once I found one in my sheets! Their number isn’t scary enough to alarm me and I haven’t experienced any bites or anything like that, but I’m curious why I have so many non rent paying dwellers.
They seem to almost disintegrate when squished. this could be a very obvious response, but I haven’t met anyone who could tell me what they are.. and if I should be worried.
Thanks in advance,
Signature: Lady Sharing Her Apartment


Hey Lady,
You have Silverfish, a common household pest that can be very difficult to eliminate.  They eat a wide variety of foods, including the starch in book bindings and in wallpaper glue.  If your apartment has wallpaper, they are most likely feeding on the glue as well as stray food they might find.

Letter 2 – Silverfish

What the Bugg
Location: South western Ontario, Canada
January 4, 2011 8:28 pm
I have been seeing this bug in may apartment lately and he is very fast.This time i managed to catch one and get these pictures. i tend to see them in the bathroom more often then other rooms. I am hoping you guys can help me figure out what he is. I live in southern Ontario if that helps! If you have any questions or want further pictures i have tons. Hoping you can help!
thanks in advance.
Signature: Ashley


Hi Ashley,
This common household intruder is a Silverfish, a nocturnal, omnivorous forager that is generally found in dark damp places like under the sink.  It will feed on a wide variety of household items including the starch on wallpaper and book bindings.  Once they are established, they can be very difficult to eradicate.

Letter 3 – Silverfish

Some guy by the shower
Location: Chicago IL, USA
January 4, 2011 8:12 pm
Hello, my wife and I just moved into a new apartment and I found this guy hanging out by the shower. He looked alright, not too mean or anything. I’d say he’s about 3/4” in length… and pretty light. dark up by the head, then fading out to silver/off white maybe. Found another one of the same type of bug, almost exactly, in the exact same spot, right along the wall by the shower yesterday. As much as I want to be friends with them, any advice you could give to help them from coming back would be helpful. Judging by the photo, that trim could use some help too. Thank you.
Signature: Jeremy


Hi Jeremy,
This is a Silverfish, a common household pest that will feed on a wide variety of items in the home.  They are difficult to eradicate.

Hey Daniel/WTB folks,
Thanks a ton for this. You’d think I would have put 2 and 2 together since I specifically called out silver in my description… but no. Great site by the way, I’ve always been interested in insects and probably spent a good hour reading through 12 pages today at work just for fun.
Thanks again!

Letter 4 – Silverfish

Apartment dweller
Location: East central Illinois
February 21, 2011 1:31 am
I have noticed a few of these bugs in my Charleston, IL apartment. I noticed them mostly in the warm summer/fall months, and then hadn’t seen one until today when the weather got warm again. I have been trying to figure out what they are for a while with no luck.
Signature: CGB


Dear CGB,
This is a Silverfish, a common household pest.  It seems they are getting even more common if the number of identification requests we have received recently is any indication.

Letter 5 – Unknown Bug found in Bath may be Silverfish

looks like a louse, but the legs are all wrong…
Location: Los Angeles, CA
March 8, 2012 12:39 am
Hi Bugman,
I found a bug while bathing my kids. Singly in the water.
I have looked and looked online. The closest thing is lice. But it is soooo different looking…
* Color and opaqueness
* size
* visible dark eyes
* visible internal ’organs?’
* Antenna similar length smooth and seem segmented looking
* smooth
* tubular body
* legs tucked under
* legs are set of 3 flat ovals with tiny simple foot kicking out at about 45degree angle, all pressed against underside of body not visible from top view. with two additional very small front legs that are leg like (not flat disc like the other 6) ending with a single point foot (not claw like like a louse).
* the upper torso is segmented (like a crawdads tail) and tapers down the abdomen ending with two points at the back.
* the torso is slightly larger than the abdomen – more oval to accommodate the tucked legs.
* each leg comes from one of the segments.
The mouth parts are hard to see, but seems to have a little bit of a two part mustache (palp). The way the light hit they eyes it seemed like they might be compound because there were a lot of light dots reflecting back.
It is a soft exoskeleton which yields to the tip of the pin as I push.
It is about 7.5 mm long (9mm to the tip of antenna).
Other info:
The cat jumps into the tub when it is empty and drinks water that pools under the faucet.
I always rinse the tub before bathing, but sometimes more than others. I was tired this evening, put about 70% into it.
So it could be from the outdoor cat, or from the kids. It was a hair washing night… or…
I sure hope I was able to give enough information, clearly enough for you. I used a 30x – 25mm illuminated loupe to ID this little guy. I don’t have anything that would be able to photograph him though…
Thank you,
Signature: Lesley Sue

What’s That Bug???

Dear Lesley Sue,
We do not believe this is a Louse, but we are uncertain of its true identity.  It most closely resembles one of the plant sucking insects in the order Hemiptera, most likely an immature nymph.  We suspect it might be something the cat brought in.  The photo doesn’t have much detail.  You can try browsing through the photos on BugGuide from the suborder Auchenorrhyncha to see if you can find a match, or perhaps one of our readers will write in with a comment.


  • Bugman

    Bugman aka Daniel Marlos has been identifying bugs since 1999. is his passion project and it has helped millions of readers identify the bug that has been bugging them for over two decades. You can reach out to him through our Contact Page.

    View all posts
  • Piyushi Dhir

    Piyushi is a nature lover, blogger and traveler at heart. She lives in beautiful Canada with her family. Piyushi is an animal lover and loves to write about all creatures.

    View all posts
Tags: Siverfish

Related Posts

6 Comments. Leave new

  • I can’t help but wonder if it is a lawn shrimp? Has that kind of crustaceanish shell to it…

  • It’s like a silverfish with the antennae damaged and the tail filaments missing. Seems to happen a lot to these fragile little guys!
    What gives it away for me is the long palp visible to the right of the antennae.

  • Has anyone figured out what these things are!?! I am in Minnesota and have them in my apartment bathroom as well. I’m really freaked out about them possibly going inside me or my kids! Through nose or buttocks or ear or even worse, crawl around in mouth for a bit. They most resemble silverfish but are significantly smaller in size and everyone looks the same so its not damaged silverfish. Its like a slug-fish or something. They are so flippin creepy.

  • I had a bug that looked sort of like this under a floor towel in front of the towel that sometimes would get a little damp. This bug seemed like it liked darkness under the towel, but didn’t really move a whole lot when I moved the towel away. The bug I saw saw was just a little bigger than this one. It looked a lot like something that you would think would be pulled out of the ocean.
    I don’t know what it is. (It took me about an hour to work up the courage to pick it up, it always takes me a long time to finally get to the point of just picking up a bug. Pretty pathetic, I know.)

  • I had a bug that looked sort of like this under a floor towel in front of the towel that sometimes would get a little damp. This bug seemed like it liked darkness under the towel, but didn’t really move a whole lot when I moved the towel away. The bug I saw saw was just a little bigger than this one. It looked a lot like something that you would think would be pulled out of the ocean.
    I don’t know what it is. (It took me about an hour to work up the courage to pick it up, it always takes me a long time to finally get to the point of just picking up a bug. Pretty pathetic, I know.)


Leave a Reply

Your email address will not be published. Required fields are marked *

Fill out this field
Fill out this field
Please enter a valid email address.
You need to agree with the terms to proceed