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Home » articles99 » CRAYFISH CONTROL

CRAYFISH CONTROL

 
  1. CRAYFISH BIOLOGY
  2. HOW CAN CRAYFISH DAMAGE PRIVATE LAND AND WATER?
  3. NET TRAP CRAYFISH
  4. CRAYFISH REPELLENT
  5. CRAYFISH GAS REPELLENT
  6. CRAYFISH SOUND REPELLER
  7. CONTACT US


AMERICAN CRAYFISH
AMERICAN CRAYFISH

Crayfish, also known as crawfish, freshwater lobster, mud bugs, freshwater crab, crawdad and several other names depending on where you are in the United States, have become a major nuisance in certain regions of the country. There are over 300 species in our country; several species are raised specifically to be eaten. However, as people have relocated populations close to streams, rivers, ponds and lakes, crayfish problems have developed. This article will explain why crayfish can become a problem and then offer control measures to help reduce damage and populations which are too large.

CRAYFISH BIOLOGY ^

MAN HOLDING CRAWFISH
MAN HOLDING CRAWFISH

Crayfish are natural food for many animals including snakes, mink, otter, raccoon, birds and many species of fish. Property owners will plant crayfish in ponds and lakes in an attempt to feed their private fish stock. Given the chance, these initial populations will bloom uncontrollably and if given the chance, can actually reduce fish breeding as well as lead to damage of important lake shore.

HOW CAN CRAYFISH DAMAGE PRIVATE LAND AND WATER? ^

Crayfish cause damage property several ways. First, they eat a lot. They love fish eggs and fry and seek such food supplies when available. Their tenacious diet will prevent local fish populations from developing properly. Be careful when trying to use crayfish as a main food supply hoping to feed fish which will grow unusually large because of the abundance of crayfish. In the end, a large population of crayfish may lead to decreasing the amount of fish you’re trying to grow.

CRAWFISH CHIMNEY
CRAWFISH CHIMNEY

The second way crayfish cause problems is with their burrowing. This can occur two ways. Initially, most species will burrow out onto the water shore and emerge a few feet up on dry land. Their burrows serve as a way they can retreat from the water as well as to provide shelter. This happens all the time where crayfish are present; most of this is never noticed by land owners.

However, as populations of crayfish increase, their burrowing will reach further and further out into turf areas. Overcrowding will cause them to leave the water to nest. Basically they’ll be walking out past existing burrows to dig new ones further and further away from water. This digging will occur mostly at night and generally leads to turf damage in two ways.

CRAWFISH IN GRASS
CRAWFISH IN GRASS

Crayfish burrows will be killing plants and shrubs as they dig. Additionally, their burrows are unsightly. Some people refer to them as “chimneys” or “crayfish castles”. Regardless these “castles” are not attractive in the yard.

Another type of damage which stems from these burrows is caused from predatory animals which will dig looking for food. Raccoon, skunk and armadillo will regularly dig into turf causing even more of a mess as well as additional damage. Remember, humans are not the only animal which enjoy a good crayfish meal.

In summary, crayfish can rapidly multiply leading to populations which the local water environment may not be able to sustain. To keep these numbers in check, there are two things you can do.

 

NET TRAP CRAYFISH ^

If you have a lot of water on your property and need to remove a lot of crayfish rapidly, use some CRAYFISH NET TRAPS. These are relatively inexpensive and very effective at catching a lot of crayfish quickly. Set them out along shore lines with twine leads for quick removal. Feeding crayfish are easy to catch and will readily come onto these offerings. But in heavily populated waterways, you only have to set the trap in the water and within hours these nets could have several on top ready to be removed.

Crayfish Net Trap

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CRAYFISH REPELLENT ^

CRAWFISH CASTLE
CRAWFISH CASTLE

If you don’t want to kill the crayfish or if you only have a few areas with activity, apply one of our repellents.

BLACK SNAKE SULFUR releases a nasty odor down their castles they can’t ignore and will readily retreat to a new location once applied. You’ll see them leave within a few days.

It won’t hurt them or any other animal or insect. But crayfish won’t like its “taste” once it trickles down into their home and they’ll move away.

For best results, first draw a “line” along their point of entry. This line will effectively act as an invisible fence of sorts keeping them from moving closer.

Next, level or remove large castles and then apply 6 tablespoons of Black Snake per castle. Renew the applications if they rebuild destroyed castles or if new castles appear.

SULFUR SNAKE REPELLENT

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If you have too many castles to treat with the repellent, NBS sprayed on each will do the same job. Add 3 oz per gallon of water and apply a pint of mixed solution per castle. Treat any new castles that appear following your initial application.

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Now keep in mind these are repellents so there is a chance they may relocate to another area in the yard. And if this starts to happen, you should consider treating more of the yard. You’ll get about 500 sq/ft of coverage per mixed gallon of NBS.

CRAYFISH GAS REPELLENT ^

If you have crayfish castles appearing in dry areas or above a nearby water supply such as a pond or retaining ditch, gassing them with GIANT DESTROYERS will render their tunnels unusable. This sulfur based repellent will actually kill crawyfish if they don’t leave. But if they avoid the gas and escape, the sulfur will coat their tunnels rendering them unusable.

Gassing is effective for large areas littered with crayfish because you can many times treat several burrows with one just one gasser. This will happen because the gas can travel 10-25 feet and often times many tunnels are linked. This means one gas stick applied to an active burrow can effectively fumigate 3-5.

To see this happen, carefully watch all nearby burrows to see if you notice smoke releasing from their top.

To gas a burrow, you’ll need to remove the castle and then drop a lighted gas stick down the tunnel. Place the castle over the hole for at least 10 minutes to ensure the smoke locks into the soil.

Plan on using one stick per burrow but remember it could end up treating 3-5 depending on the spread of the underground tunnels.

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CRAYFISH SOUND REPELLER ^

After you gas or powder their burrows, install our SOLAR POWERED SOUND REPELLER for a permanent solution. This design is one of kind and not available elsewhere. True, there are models which look like ours but they don’t have all the features our units have which are important for certain pests like crayfish.

This device uses the sun to charge an on board battery so it runs on its own power around the clock.

Once installed and powered on, it will release different sounds including rattles and vibrations that will both move the ground and create a sound wave crayfish don’t like. By default, they vibrate several times a minute and they change their cycle.

In addition to sound, they use small white LED bulbs located on underside of controller head. These light up when its dark which effectively tell you the units are working. When placed close to active crayfish, they will become uncomfortable.

Coverage for these units when used on crayfish can be as much as 4,000 sq/ft per unit. But not initially.

So when you first place them out, you’ll want to start at the area “closest” to you, basically their “latest” nest/castle locations. We call it the “outer edge”.

This “outer most” area should be lined with repellers spaced 30 feet apart. After a week, move them toward the retreating crayfish which will probably be further “away”. Do this every week, moving them about 10 feet further “into” the crayfish areas so you are effectively “taking back” some of the yard/land.

To insure they don’t “flank” your placements, leave at least one behind to cover the vast open “clean” area. For that placement, the 4000 sq/ft will be a good amount of land that can be protected per machine.

For the front line, place units 30 feet apart making the “line” as wide as is needed. So if you have a 60 feet line you want to create, there will be 3 units needed. For a 90 foot line, 4 units.

Ultimately, once the land is  purged of activity, place the units out in a “checkerboard” pattern so the entire yard is protected.

Installing Ground Sound Repellers should be done after you treat active burrows with either Pest Rid,. Sulfur or Giant Destroyers. Plan on getting them charged for two days before installing them to ensure their battery is fully charged.

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DO NOT force these into the ground; use a good SOIL AUGER to drill the proper sized holes.

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CONTACT US ^

Give us a call if you need further help. Our toll free is 1-800-877-7290 and we’re open Monday through Thursday, 9:00 AM to 4:00 PM. On Friday, 9:00 AM to 4:00 PM and on Saturday, 9:00 AM to 2:00 PM (Eastern Standard Time).

Email questions here:   https://bugspray.com/about-us/contact-us

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Comments

  1. Anonymous says

    March 15, 2012 at 10:07 am

     

    Thanks for the info. My yard has been taken over by these creatures. Having always lived in the desert areas, this is a new problem for me.

    Reply
  2. gary says

    May 30, 2012 at 9:30 am

     

    Can you tell me where to buy this fire ant killer powder?

    Reply
    • Tech Support says

      May 31, 2012 at 6:55 pm

       

      Here is a link to this item in our cart. Please show your support for our business by purchasing the items we recommend from the links provided. Remember, this is the only way we can stay around and be here to answer your questions and keep this valuable web site up and running. Thanks for your business!

      Acephate: https://bugspray.com/catalog/insecticide/wettable-powder/orthene-75-acephate-1-lb

      Reply
  3. Ann says

    June 9, 2017 at 3:40 pm

     

    Thank you so for this information. We’ve always had a few mounds but over the past three years but now they’re taking over. We also have a lot of snakes. I never thought about the crawdads being a food source for the snakes. Your site has been very helpful and we will be ordering your products. Thank you.

    Reply
  4. Joy says

    July 5, 2018 at 12:26 pm

     

    I have several mounds in my yard. I also have a dog that continues to eat them. Are they harmful to dogs? Can they cause Gallbladder issues?

    Reply
    • Tech Support says

      July 5, 2018 at 12:50 pm

       

      Joy,

      We’re not aware of crayfish causing gallbladder issues in dogs but like people, pets can be allergic to the crayfish shell.

      In general, Vets will say to be careful giving dogs shrimp, crab, lobster or crayfish because of the spices we add to them when we cook. But these same vets will also say to never give pets the shell as this can be more problematic for other reasons, mostly allergies, similar to what people experience.

      At this time you should consider treating them as explained above.

      Another option is to install some of our ground sound repellers. We have units afield being tested right now that are performing well on crayfish so we’re optimistic they will do the job. Basically they get installed along the side of the yard where they crayfish are active and the sound they send out combined with the vibration waves they transmit to the ground is highly repellent to crayfish making them leave. If the data continues to support using them, we’ll be adding these devices above as a viable way to get rid of crayfish. We know they work on snakes, moles, gophers, voles, lizards and frogs. And they pose no hazard to pets. Also, they are solar powered so once installed, they’ll work around the clock needing no maintenance which is nice.

      Solar Mole Repeller: https://bugspray.com/repellents/sound/deluxe-solar-powered-mole-vole-gopher-snake-repeller.html

      Technical Support
      U-Spray Bugspray
      http://www.bugspray.com
      1-800-877-7290

      Reply
  5. Mary P says

    November 16, 2018 at 1:45 pm

     

    We have 8.5 acres which is all bordered by a creek. The pastures are riddled with crayfish burrows, one in particular. What would be the best option for getting rid of crayfish in an area this large? The burrows created spreading holes which the horses can step in and get injured. We have horses, goats, dogs, cats, and chickens.

    Thanks!

    Reply
    • Tech Support says

      November 16, 2018 at 1:56 pm

       

      Mary,

      As detailed in our article above, use the Gassers to “gas” as many castles and burrows as possible. This will force them out but will not be permanent. To make sure they don’t return,, install the sound repellers also listed above. You will need to do this in “sections” starting from the furthest part of the activity away from the creek and by clearing them out in sections. The goal is to “take back” land by gassing and then installing 2-4 units along a line forcing them to retreat and stay out.

      Now once you go 2 weeks without them coming back along that line, you can take back more land by gassing more burrows and relocating the repellers even closer to the creek. Eventually you should be able to push them back to where you won’t have them active in the land you want to keep clear.

      We also suggest doing this on a small section first using 3-4 repellers so that you can see the time frame needed, how many gas sticks you’ll for other sections, how many solar repellers you’ll need, etc. Plan on spacing the repellers 50 feet apart to start.

      Once areas are clear, leaving the repellers in place will keep the area clear. And they should be able to protect 1/4 to 1/2 acre per unit once the land is purged but again, the exact max protection you get will depend largely on the type of ground so its hard to say for now.

      In summary, the crayfish took time to invade and disperse over the area so plan on taking some time to clear them out. But over time, you should be able to reclaim most all of the “lost” land.

      Technical Support
      U-Spray Bugspray
      http://www.bugspray.com
      1-800-877-7290

      PS: Are you signed up for our informative twice a month Pest Report Newsletter? More info here: http://bugspray.com/bugspray_pest_report.html

      Reply
  6. Donna says

    March 25, 2020 at 11:48 am

     

    When applying a powder or spray, should all the water in your yard be gone or can it be applied when the ground is still wet and\or waterlogged?

    Reply
    • Tech Support says

      March 25, 2020 at 12:11 pm

       

      Donna,

      Water is a carrier for most everything used for this pest so it’s okay if the area is wet. Basically the wetness will help the treatment get faster and deeper penetration.

      Technical Support
      800-877-7290

      Reply
  7. Dee Vida says

    July 28, 2021 at 2:13 pm

     

    I wonder about the sound repellers sticking up in the yard- do I have to remove them every week when I mow, or do they sit flat on the ground? Can I mow over them?

    Reply
    • Tech Support says

      July 28, 2021 at 2:33 pm

       

      Dee,

      So for sure the units will be “sticking up” as you can read about on our product page here:

      Solar Mole Repeller: https://bugspray.com/repellents/sound/deluxe-solar-powered-mole-vole-gopher-snake-repeller.html

      But when using them for crayfish, the process will involve installing them first in the grass but then moving them out further and further “out” eventually having them at the lawn’s edge. This way they will not be “in” the grassy areas you’re cutting unless you need to keep them there. But we don’t recommend doing that; no need to for most problems.

      Technical Support
      bugspray.com

      Reply

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