By: Mike Gannon | Posted On: February 23rd, 2011 | 94 Comments on GRASS CARP FOR YOUR POND | In: AQUATIC PLANTS

Triploid grass carp, Diploid grass carp, white amur….not very alluring names for a fish that one may want to stock their natural pond with. Grass carp (Ctenopharyngodon idellus) are not really the greatest looking fish to keep in your pond and on top of that they are certainly not easy to acquire, and would probably require a permit to keep in your pond. Who wants to do paper work just to get a fish? Why bother!?
I’ll tell you why to bother with these fish: aquatic weed and algae control for your natural pond or lake.
Better yet, organic aquatic weed and algae control.
Oh, so suddenly these fish are appealing right? You bet!
The Grass Carp is a somewhat misunderstood fish that has a lot of misinformation attached to it. Even the name, Grass Carp, to pond keepers will conjure up images of fish that look like koi or common carp but the physical similarities are few. The Grass Carp has a sleek elongated body with silver/white/gray coloration, a broad head, no barbs on the mouth area, and finnage that is different from the carp or koi. The Grass Carp really looks more like a huge minnow than a carp!
This fish has been around for a very long time and has served mankind on many levels. Grass carp is a native to China and the Chinese have used these fish to control weed growth in rice paddies and also as a food source for about 2000 years. Marco Polo made mention of this fish in his travels and for close to 300 years the Russians have utilized the white amur / grass carp for aquatic weed and algae control to. This hardy vegetarian river fish has provided an economical cost effective solution for algae and weed control across the globe. In more recent times the grass carp was used in Egypt to clean up the Nile River itself! In modern times this quick growing, great tasting, fun sport fish is outlawed in much of the U.S. because of environmental impact misinformation regarding this fish.
Grass Carp were introduced to the United States in 1963, and today is considered an invasive species. The belief that grass carp will reproduce out of control and destroy ecosystems led Arizona, California, Colorado, Connecticut, Georgia, Idaho, Illinois, Indiana, Louisiana, Maine, Maryland, Michigan, Minnesota, Nebraska, Nevada, New Hampshire, New Mexico, New York, North Carolina, Ohio, Oklahoma, Oregon, Pennsylvania, South Carolina, Tennessee, Texas, Utah, Vermont, Virginia, Washington, Wisconsin, and Wyoming to make them illegal; with most of the remaining states requiring permits to stock these fish. This misunderstood fish, according to fisheries biologist really shares little of the traits that its carp namesake has.
The grass carp does not muddy the waters of ponds or lakes in its efforts to eat plant materials; like its cousin the European carp. The grass carp actually tends to “mow” plants, eating them from the top down because of the way its mouth is placed. The grass carp does not tear out aquatic plants by rooting and muddying the water. Grass carp also do not prey upon invertebrates, fish eggs, or small fish; they much prefer water weeds and thin leaved pond weeds. With enough food supply the grass carp can get to be a pretty good size. In the first 2 years they can grow incredibly fast, up to 2 inches per month, and weigh up to 20 pounds. Average adult weight is about 40 pounds at 4 feet length, but some full grown grass carp have weighed in at 100 pounds!
Grass carp do not destroy nesting areas of waterfowl as may be reported, and prefer moving water as their natural habitat, like rivers. Many biologists report that grass carp can only reproduce in river systems as the eggs need river conditions to be successful. Successful spawns in standing water is impossible yet the practice of sterilizing these fish is commonplace. The sterilized form of the grass carp is a triploid carp, fertile grass carp are diploid carp. These fish live about 10 years but can live much longer under the ideal conditions. During winter months the Grass Carp goes through a period of dormancy. When water temperatures stay about 65F-70F these fish feed intensely, but may be shy about feeding in areas of human activity like swimming areas or docks.
To obtain these fish for pond stock contact your state’s Division of Wildlife to be directed on how to obtain them in your area and to have your pond evaluated to see if you are indeed eligible to keep the Grass Carp. A rough diagram of your pond may be asked for. A basic requirement for most ponds that want to stock these fish is that the ponds are large enough, and do not have any areas that can allow for escape of these fish into other bodies of water. If you have an inline pond that the fish can easily escape from you will not likely be permitted to keep the Grass Carp. When introducing Grass Carp you may only be allowed to stock a few and these guidelines will depend on your state’s regulations. About 10 grass carp per acre is a good starting stock level. Once stocked in a pond they are not easy to get out. Grass carp are very effective at controlling weeds, but the results may take a little time to become apparent, but fear not these fish do their jobs eating up to 3X their own body weight daily!
So if you want to say goodbye to costly ineffective chemical treatments for your pond’s weed and algae problem, then the white amur (grass carp) may be your solution. Very effective “worker” fish and they even can provide some sport from your pond too, being known for putting up a good fight and being smart as trout. With their long life spans they could even become aquatic friends to you, keeping your ponds undesirable plant growth in check for you. Be sure to check your state’s laws concerning these amazing fish and stock wisely.
All copyrights to this material belong to Mike Gannon.

Written by Mike Gannon

Mike Gannon

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The LOVEYOURPOND Blog is written by Mike Gannon of Full Service Aquatics located in Summit, NJ. Mike is an award winning pond, water garden, and water feature builder. Always “In The Pursuit Of All Things Aquatic” Mike has been a lifelong hobbyist and providing professional services since 1995. Mike is the creator of The Pond Hunter video series seen on Youtube and has made several television appearances on Networks such as HGTV and the DIY Network. He also hosts the Pond Hunter Radio Broadcast, a show on everything aquatic, every other Wednesday at 8pm EST. You can see what else Mike is up to at the following sites:

    94 Comments on GRASS CARP FOR YOUR POND

    Comments Feed
  1. Mike Gannon Says:

    on July 19, 2019 at 5:38 pm

    3-5 carp per acre should be considered. Good luck. -Mike

  2. Aarif Ali Says:

    on June 16, 2019 at 9:31 am

    Sir I’m from India my lake is 55 hector depth is average 3 meter feed is more much sufficient Grass under water how many grass carp will rec. So help me

  3. Mike Gannon Says:

    on March 26, 2019 at 9:36 pm

    Hello Joe. I’d go with colorful fish as well! Good luck. -Mike

  4. Joe Labelle Says:

    on March 24, 2019 at 9:02 pm

    I am told by a neighbour that I can raise carpe in my 16x 24 swiming pool during the winter and sell them in the summer?
    any recommndations he has suggested coloured ones?

  5. Mike Gannon Says:

    on March 26, 2019 at 9:37 pm

    Well Wolfman, it depends on who had a better attorney. Best of luck to them both. – Mike

  6. Wolfman???? Says:

    on March 23, 2019 at 6:52 pm

    I’m getting a pair of hybrid cichlids called the (RED PHEONIX KING CICHLID ????) the male grows up to a large 28 inches the female 20″ they’re South and Central America mixed they are extremely extremely extremely extremely extremely aggressive/territorial/quarrelsome and predatory. I just want to know since purists think the texas cichlid is the most aggressive. who would win in a territorial dispute my Hybrid or the texas cichlid.

  7. Mike Gannon Says:

    on January 26, 2019 at 7:15 pm

    Hello. I am making an educated guess that the carp would eat the weed and grass you have growing in your pond. Typically stocking would be 3-5 carp per acre. Merci de tendre la main! Bonne chance.

  8. Des Jones Says:

    on January 24, 2019 at 5:34 pm

    Hello, we have a three quarter lake in France. It has a lot of Canadian pond weed and grass, will grass carp eat Canadian pond weed. If so how many carp would you advise.
    The lake has about 10 springs feeding it and is very clear. Average depth about 5 feet running to shallow end of about 3 feet. Many thanks and a very interesting blog.

  9. Mike Gannon Says:

    on October 16, 2018 at 8:06 pm

    Hello William. If you add aeration to your pond you’ll likely have the smell dissipate. Good luck. -Mike

  10. William Weiss Says:

    on September 24, 2018 at 8:22 am

    We have a 1/2 acre pond (8′ max depth) in CT that has 6 legacy Amur about 2-1/2-3′ size. Our pond is fed from one upstream smaller pond off property, which is spring fed.

    The water is completely free of vegetation and algae, tea-brown, has a fishy odor and there are thousands of tadpoles and frogs. Any thoughts as to improving water clarity? And smell?

  11. Mike Gannon Says:

    on September 9, 2018 at 2:38 pm

    Hello Anthony. Thanks for reaching out and providing that excellent feedback that so many are looking for. I’m very happy you had such positive results. I don’t think the grass carp will eat back any mature existing growth of reeds, but they will eat and help control new growth. I’m not sure how big your pond or really know enough about the density of aquatic plant growth of your pond to accurately say whether there will be enough food to support the population. I do think that 20 grass carp sounds like a higher population count, and if they ate such large quantity in a period of 90 days it does not sound sustainable, you may want to provide some food for them, OR lower the population of the grass carp. Thank you so much for sharing your experience with these fish! Best of luck and cheers -Mike

  12. Anthony Broadhead Says:

    on September 9, 2018 at 8:44 am

    Hi Mike, we put about 20 grass carp (probably too many I know but the people selling them were very persuasive) into a self contained spring fed pond here in the UK earlier this summer – incredible result! They have cleared it completely in the space of 3 months. The water is now weed free and crystal clear. 2 questions: the pond is about ¼ acre and about 1/3rd is covered with reeds, which seem to grow from a network of tubers on the bottom – will they start clearing these for us? Secondly, now that the duck weed etc is gone, will there be enough natural stuff, leaves, reeds etc for them or should we provide some sort of supplement? Many thanks, Anthony, Dorset, England

  13. Mike Gannon Says:

    on July 25, 2018 at 11:23 pm

    Hi Karen. I am not sure what your local regulations are regarding grass carp, but even if they are legal I don’t think they would be a good fit for a pond that small. Thanks for reaching out. -Mike

  14. Karen Says:

    on July 24, 2018 at 12:29 pm

    We have a Koi pond with a waterfall in Colorado. It is about 10 feet x 8 ft and 3 feet deep. A friend suggested that we get a couple of grass carp to keep it clear. Can grass carp co-exist with the koi in our little pond? Can we even get grass carp in Colorado?

  15. Mike Gannon Says:

    on June 3, 2018 at 10:39 pm

    Hello Jim. Your pond sounds great! Triploids should do just fine. Reach out to your local Division of Fish and Wildlife (or whichever agency name in your area) to find out about stocking and procuring some of the fish. You will need a permit to keep them and the agency will typically issue the permit and provide resources for obtaining the fish. Good luck! -Mike

  16. James Honert Says:

    on May 27, 2018 at 12:02 am

    Dear Mike
    We have built a 0.3 acre pond and stocked it with rainbow trout. We are located in NE Utah.
    Our pond elevation is 6170′. It is up to 8 ft deep. It is fed by an inlet spring that flows year round at 15 gpm or more. Inlet temperature ranges from 48 degrees in winter to 55 degrees in summer. The pond temperature reaches a maximum temperature during summer of about 60 degrees. Will triploid grass carp survive is a pond like this? We hope to control algae and vegetation. Do you know any sources that we can acquire these carp?
    Jim Honert

  17. Mike Gannon Says:

    on June 3, 2018 at 10:40 pm

    Hey Joe. If you can get approved for grass carp ( you need a permit to keep them) then I’d say go for it. I think they will still come out to feed along the shoreline regardless of how deep your pond is. Good luck. -Mike

  18. Joe Dickerson Says:

    on May 25, 2018 at 2:43 pm

    I have a 6 acre pond that I was told that 10-20 carp per acre should be enough. The pond is 2-3 ft around the banks, and gets to about 12-15 ft in the middle and by the dam. I have a spill way in the pond and is fed by spring and creeks. I was told by one person that grass carp would be the way to go to control the weeds etc. I was told by another that it would not be due to the spill way and depth of pond. I was told that the carp would first manage to escape from the spill way, and I would be wasting my money. Then he told me that the carp most likely would not come out of the deep portions of my pond to feed in the shallow ends due to cooler temps in the deeper end. I don’t have a problem with weeds in deeper portions, just in the shallows where sunlight of course penetrates. Can you advise please.

  19. Mike Gannon Says:

    on October 26, 2017 at 10:25 pm

    Hello Ralph. Although deeper is preferred, the carp should do just fine in that depth of water. Thanks for reaching out! -Mike

  20. Ralph Williams Says:

    on October 26, 2017 at 5:42 pm

    Hello Mike,
    Our 8th pond on the golf course here in Telford England is about 50 yards by 40 yards and is about 3 to 5 feet deep.
    I have put 4 off 8 inch grass carp in to help weed control.
    The pond has a big fountain to look good and aerate the water.
    Will the fish be OK in this shallower water?
    Kind regards from Ralph ….

  21. Mike Gannon Says:

    on September 28, 2017 at 8:46 pm

    Hello Tom. I’m glad to hear that they are doing their job! I have never heard of grass carp running out of food, but worst case scenario is giving some food to them from time to time. Good luck!! -Mike

  22. Tom Luethye Says:

    on September 25, 2017 at 6:29 pm

    I placed 20 grass carp in out 2 to 2-1/2 acre pond this spring. Algae & weeds have been well taken care of. Can they run out of a food source?

  23. Mike Gannon Says:

    on September 14, 2017 at 5:19 pm

    Hello Bruce. The cause for the green condition of the lake is not likely due to the fish, but rather local environmental conditions. Are you taking any steps to actively clear the water? If not then take the most basic step and add aeration to the pond. There are MANY things you can do to clarify a pond/lake but it is typically a budget driven issue.-Mike

  24. Bruce Whited Says:

    on September 11, 2017 at 11:26 pm

    I planted Grass carp in my 2 ac. pond the average depth is 10 feet.
    The lake was heavily infected with char algae. The algae was to much for the grass carp to handle so I poisoned the algae. I have about 11 grass carp left and the neighbor put in two asian, colored carp. They appear to be healthy and look to be about 15 lbs in size. My problem know is Algae plume, the lake is olive green in color. Did the Grass carp have any thing to do with it. How is the best way to clear the water up.

    Bruce Whited

  25. Mike Gannon Says:

    on June 29, 2017 at 11:03 am

    Hello Pat. You need the type of carp this article talks about. I would guess 4-5 grass carp would do the trick! Good luck. Mike

  26. PAT DOUGLAS Says:

    on June 13, 2017 at 6:52 pm


  27. Mike Gannon Says:

    on May 30, 2017 at 11:09 pm

    Contact your local Division of Fish and Wildlife and ask for someone to come and identify them. Hope they are NOT sharks!!! Good luck. -Mike

  28. Marilyn Adams Says:

    on May 17, 2017 at 10:51 pm

    We have at least 3 huge fish swimming around the surface of our pond. They swim in circles (like sharks 🙂 we suspect they might be grass carp that we put in the pond in the late 1980’s. If so… they must weigh at least 100 pounds. Is there someone we can call to try to identify what kind of fish they are. We don’t want anyone to try to catch them. It’s strange that we have never seen them before. Thank you.

  29. Mike Gannon Says:

    on May 30, 2017 at 11:08 pm

    The grass carp will come around,and hopefully become VERY effective. Good luck. -Mike

  30. Suzanne Frisse Says:

    on May 14, 2017 at 2:51 pm

    I’ve been struggling with an acre pond covered with duckweed for three years now. Bought tilapia last summer that did absolutely nothing and of course, died off at the first sign of cold weather. I released ten grass carp in the pond in late March and have yet to see any activity. We’ve had heavy rains and I have a spillway but not pipes. The farmer I bought them from said they wouldn’t float out unless I had pipes. I throw catfish food out just to see if anything comes up for a nibble, but all I’m getting are red-eared sliders. I’ve never seen any floaters so not sure what to make of all this.

  31. Mike Gannon Says:

    on May 30, 2017 at 10:55 pm

    Response sent! Thanks for following up. -Mike

  32. DavidHughes Says:

    on May 8, 2017 at 6:51 pm

    Hi Mike,

    I sent you an email about grass carp and my lake in France.

    Are you unable to respond?

    I would be very grateful to hear from you

    Kind regards,


  33. Mike Gannon Says:

    on May 30, 2017 at 10:49 pm

    Hello David. Yes, the grass carp would certainly help! Good luck. -Mike

  34. David Hughes Says:

    on May 2, 2017 at 9:14 am

    Hi Mike,

    I have a small lake here in Northern France which I have created for fly fishing for rainbow trout. It is about 1.3 acres and varies from 1.5 – 3.0 metres deep. I have only finished the lake in November last year but I now have a problem with filamentous algae and a virtual blanket covering with starwort. Would grass grass carp help me get rid of these weeds? I have invested in an ultrasonic system for control of the algae but it is too soon to see if this system is effective.
    I would be grateful for your views.

    Kind regards,


    PS Our website is not yet full up but you can follow us on our facebook link.

  35. Mike Gannon Says:

    on April 19, 2017 at 3:15 pm

    Hello. It sounds like you are doing research. Keeping fish for research purposes is very different from “hobby” level fish keeping. I am not sure that the grass carp would do well in the containers you describe for any long period of time, however I am not fully confident in that. Good luck!! -Mike

  36. Prerna Says:

    on April 16, 2017 at 4:09 pm

    Hello Sir,
    I want to keep grass carp in 200l drums and feed them with aquatic weeds for my research purpose.
    Will they survive in this small place?
    Is their any possibility that grass carp become diseased due to macrophytes?

  37. Mike Gannon Says:

    on March 20, 2017 at 11:51 pm

    Hello Gary, time for more grass carp! Thanks for the feedback. -Mike

  38. Gary Pedersen Says:

    on March 20, 2017 at 11:19 pm

    I had 7 or 8 10″ grass carps in my 1 acre pond for over 10 years and not only grew over 3 feet in length they controlled grass and algae quite well, but they unfortunately have died out, evidently. So I need to buy more.

  39. Mike Gannon Says:

    on February 18, 2017 at 4:33 am

    Hello Michael. Grass carp can help with aquatic weeds but may not help that much with aggressive water lily growth. I’m not sure exactly what type of research you are looking to conduct so my humble advice is GTS it. (Google that shit!) Good luck! -Mike

  40. Michael Says:

    on February 18, 2017 at 12:17 am

    Can you suggest a research that I can submit to my proffessor ? I am interested in grass carp. 🙂 coz fish kill occur in the cages because of too much weed in lake especially water lilies. do grass carp eat water lilies??

  41. Mike Gannon Says:

    on January 16, 2017 at 6:29 pm

    Hello Eldon. Grass carp can live a couple decades under the right circumstances. They are better at eating aquatic algae and vegetation during their younger years so if you depend on them for algae and weed control I would rotate in some new stock every 5 years or so. Good luck! -Mike

  42. Eldon Rottinghaus Says:

    on January 14, 2017 at 8:32 pm

    How long do grass carp live, or how often should they be restocked? I have heard that the older they are the less they eat, any truth in that.

  43. Mike Gannon Says:

    on October 6, 2016 at 5:05 pm

    Hi Michael. I don’t have a great answer to that because there are many variable to consider. As a “general” guideline you may want to consider 2 carp per acre. -Mike

  44. michael jones Says:

    on October 3, 2016 at 9:38 pm

    I have a one acre pond 7 to 8 feet deep how many grass carp would i need to help keep down the coontail and duckweed in my pond.

  45. Mike Gannon Says:

    on September 25, 2016 at 8:34 pm

    Hello Anish,
    I would not suggest using grass carp in such a small pond, they can get to be quite large. They will not do well in steady water either since oxygen levels would likely be too low. Also, the name “grass” carp is a bit misleading since the really do not eat grass or many marginal type of plants, they will eat floating and submerged weeds and algae, but not actually aquatic grasses! Good luck. -Mike

  46. anish dahal Says:

    on September 18, 2016 at 5:45 pm

    Hello I am from nepal and I have two artificial ponds of about 13m length, 4m breadth and 2m depth.
    I am planning to put grass carp on them, can they survive in steady water ?
    and how can I feed them without pond weeds, can they eat other grass ?
    And should water be changed at regular interval of time ?
    Please I am so confused,
    thank you

  47. Mike Gannon Says:

    on July 26, 2016 at 3:09 pm

    Hello Crystal, thanks for reaching out! I do not think you will get much help from Grass Carp for those types of plant growth. Sometimes it really takes manual removal to get them under control. -Mike

  48. Crystal Boehm Says:

    on July 21, 2016 at 3:24 am

    Cattails are growing rapidly. Will carp help to keep the growth from becoming too dense? Also the water lilies are growing exponentially. We have purchased chemicals but do not like using them with the coi and other fish. Your comments appreciated.

  49. Mike Gannon Says:

    on June 25, 2016 at 5:03 pm

    Hi, glad to hear they did their job! If you want to feed them try using a game fish chow like trout chow. -Mike

  50. Sandy Bican Says:

    on June 25, 2016 at 2:28 pm

    Two triploid gc in one third to one half acre pond cleaned up all visible plants. Actively swimming surface. Should we feed them and with what?

  51. Mike Gannon Says:

    on June 17, 2016 at 1:07 pm

    Hey D, I have not personally used the grass carp in that way, but they do clear algae and it won’t matter to them too much if it is a retention pond or not as long as they have water year round to live in!! -Mike

  52. D Green Says:

    on June 16, 2016 at 8:13 pm

    Has anyone used grass carp to clear the algae from a retention pond?

  53. Mike Gannon Says:

    on May 27, 2016 at 1:55 am

    No, they are not. At least not in my experience, they are somewhat shy. -Mike

  54. Joe Long Says:

    on May 26, 2016 at 1:42 am

    Are these fish aggressive to swimmers ?

  55. Mike Gannon Says:

    on April 23, 2016 at 11:51 am

    Hi Scott, it would be hard to overstock because they are a regulated species and you will need a permit to keep them. -Mike

  56. Scott Says:

    on April 21, 2016 at 7:26 pm

    Hi Mike great article!
    I am going to put some grass carp in my 1acre farm pond (12 feet deep) in central illinois. Is there such a thing as over stocking with these fish? Thanks.

  57. Mike Gannon Says:

    on April 23, 2016 at 11:52 am

    Hello Paul, I think grass carp can are pretty tolerant fish, however, I am not too sure they can go into a pond that has very high organic waste. Be careful!! -Mike

  58. Paul Henry Says:

    on April 19, 2016 at 6:30 pm

    Can anyone please advise how sensitive are grass carp to the quality of water in a pond i.e. would they survive in a pond that is fed with grey water with organic waste?

    Also, is it necessary to aerate a pond or would the combination of water inflow and a fountain be enough to maintain oxygen levels?

  59. Mike Gannon Says:

    on April 14, 2016 at 12:25 am

    Hello Gary, unfortunately I do not have any sources to obtain these grass carp, they are very difficult to procure! -Mike

  60. Gary Diehl Says:

    on April 7, 2016 at 11:13 pm

    Hi Mike,
    I have a 1/4 acre pond that is 12′ deep in the center and would like to purchase some grass carp. I have checked with the Division of Natural Resources here in Salt Lake City, UT and they do not have a problem with me doing this as long as I purchase them from a certified supplier. The only 2 suggestions they had were in Arkansas and both were unable to ship to Utah. Any suggestions would be greatly appreciated.
    Thank you

  61. Mike Gannon Says:

    on April 14, 2016 at 12:26 am

    Hello Tony. Yes, I would recommend using the grass carp. You’d probably not need more than 2 carp, they are very effective. Good luck! -Mike

  62. Tony Says:

    on April 5, 2016 at 2:56 pm

    I have a 120,000 gallon swim pond. It has a bio-filter that does a pretty good job and a UV light that takes care of much of the algae. The dimensions of the swim portion of the pond are about 60×60. It’s 7.5 feet at it’s deepest. It is lined, but has a “river run”/sand gravel mixture on top of the liner about 3 inches thick. My biggest problem is with pond weed growing in this natural bottom. I am going to rake it out, but was also thinking of planting a few fish to help keep them from growing. In the Summer months I use a dye to help, but since much of my pond is shallow and the water us crystal clear it still grows. Water temp in the Summer is as high as 84 and it drops to about 60 in the winter. The pond is also well aerated with 3 diffusers in it as well as a small waterfall. Would you recommend grass carp for my situation and if so how many? Thanks, Tony

  63. Mike Gannon Says:

    on March 17, 2016 at 1:44 pm

    Nice talking with you! Hope it works out obtaining the grass carp.

  64. Kevin Stelmashuk Says:

    on March 15, 2016 at 3:29 pm

    I would like to purchase some grass carp for an HOA pond. It is a private pond in Oklahoma can we buy some the algae growth is taking over.

  65. Roy Says:

    on October 4, 2015 at 8:21 am

    I have a 1 acre lake in central France, max depth 10feet. I was told that 2 grass carp about 40pound each (probably smaller!) were stocked about 20 years ago. This summer I have caught three using sweet corn, weighing 12pound, 20pound and 22.5pound. You said they don’t breed in enclosed water, but is there any possibility that they might have done? Alternatively the stocking information I was given may not have been correct. The lake is certainly weed and algae free.


  66. Mike Gannon Says:

    on August 11, 2015 at 12:38 pm

    Hi Chris. I really don’t have any information about your pond so it is difficult for me to say how safe it would be wintering grass carp. Aeration always helps. Your pond will very likely be visited by the fish and wildlife office for an eveluation before they issue a permit for the fish. I would say that they will determine if the pond is appropriate for the grass carp. Good luck! -Mike

  67. Chris Haley Says:

    on August 3, 2015 at 5:43 pm


    We’re in northern Minnesota. Before I contact my local fish and wildlife office. Would the grass carp survive our winter? Our pond does have aeration to prevent winter kill.


  68. Mike Gannon Says:

    on August 11, 2015 at 12:41 pm

    Hey Kenny! The grass carp will definitely eat the duck weed and they will also eat a variety of other aquatic weeds. I’d try to get a survey of the aquatic plants growing in your fishing area and compare to what the grass carp eat. Grass carp are very “effective” in their eating so it may not be good news.. Good luck! -Mike

  69. Kenny Richoux Says:

    on July 29, 2015 at 5:19 pm

    Hey Mike, My HOA want to put grass carp in our 100 acre lake in the subdivision. My only concern, being an avid bass fisherman, is that the carp will eat the good grass, (duck weed) as well. We put grass carp in this lake about 10 years ago, and I have found that the bass fishing has since gone down in production. Now that grass is finally growing back, of which some is a nuisance, but not all is. I don’t want the good grass to be gone as well. Please advise.

  70. Mike Gannon Says:

    on August 11, 2015 at 12:46 pm

    Hi Bob. Contact your local Division of Fish and Wildlife, or whichever local agency Maryland uses. -Mike

  71. Bob Piskor Says:

    on July 28, 2015 at 8:30 pm

    I have a friend in Maryland that needs some grass carp in
    her pond, how do we order and get them to MD?.

  72. Bob Piskor Says:

    on July 28, 2015 at 8:28 pm

    I have a friend in Maryland that needs some grass carp n her pond, how do we order and get the to MD.

  73. Mike Gannon Says:

    on August 11, 2015 at 1:06 pm

    Hi Cynthia. On a pond that size grass carp will not work for you. Typically algae issues are due to an underfiltered pond, try finding ways to upgrade your filtration on the pond and try some beneficial bacteria treatments added frequently. -Mike

  74. Cynthia Says:

    on June 25, 2015 at 10:00 pm

    I have a small pond, about 15×18 feet, about 2 – 2 1/2 feet deep. I have 6 koi and some water lilies. The pond gets a lot of sun and I’m have a terrible time with algae despite all efforts. How many grass carp should I try? I assume one or two would be plenty.

  75. Ross J Ross Says:

    on December 19, 2014 at 11:57 am

    There was a typo in my post. I am talking about raking my pond to remove excess grass before putting the carp.

  76. Mike Gannon Says:

    on December 19, 2014 at 10:31 pm

    Hi Ross, thanks for checking out the blog. Yes, if you are able to, giving the pond a good raking will help keep the problem a little more controlled. The fish will still have a big job ahead of them so any help you provide is good! -Mike

  77. Ross J Ross Says:

    on December 19, 2014 at 11:39 am

    Hello I live in south Louisiana and have 1/2 acre pond that has a bad coontail grass problem in the summer but does back in winter. I plan to put some carp in the early spring. Five fish I guess from what I read. My question is would it be better to take my pond before putting them in. Would they be able to keep up if not once the grass comes out of dormancy? Thanks

  78. Mike Gannon Says:

    on November 26, 2014 at 8:51 pm

    Hello Dennis, I do not think it likely that the carp had anything to do with drop in water level. I’d be thinking more along the lines of muskrat activity or other type of animals that are living around the pond. -Mike

  79. Dennis Wester Says:

    on November 23, 2014 at 5:05 pm

    Live in Noblesville, IN. HOA put grass eating carp in our ponds 3 years ago. Water level has dropped significantly in the last two years. Could the carp have caused the retention ability of the base to deteriorate?

  80. Mike Gannon Says:

    on October 20, 2014 at 2:41 am

    Hi Larry, if you can get close enough to see if they have barbels or not then you will be close enough to visually see the difference. The 2 fish will not look very similar. I would take a look at side by side photo comparisons of triploid grass carp vs common carp. The differences are easy to see that way. Thanks for checking out the blog! -Mike

  81. Larry Grimm Says:

    on October 19, 2014 at 9:22 am

    A number of years ago our HOA stocked our small lake with triploid grass eating (TGE) carp. However, there are some in our community who think we now only have common carp in the lake. It is my understanding that the common carp has barbels (whiskers) whereas the TGE does not have them. Is this correct? It also appears the common has more of a horizontally oblong shape whereas the TGE is sleeker. I’ll need to go catch one in our lake to remember what the fins look like – being that this appears to be the definitive distinction – but it is getting late in the season to catch one. However, have you got any good pictures? What I have found on the internet hasn’t been distinctive enough for me to say which one is which. One other thing, the mouths on the carp I have caught are pointed somewhat downward and relatively small.

  82. Mike Gannon Says:

    on September 23, 2014 at 11:51 pm

    Hello Ahmad, thanks for reading the blog and commenting. As far as improving water quality I do recommend aeration; however I would start with submerged aeration instead of the floating aerator; you will get much better results. I also go ahead with the carp and trees too, but it all starts with aeration. -Mike

  83. Ahmad Faramarzi Says:

    on September 19, 2014 at 7:10 pm

    Two years ago, we reconstructed and expanded our pond, which is now about 1/4 acre round and about 14 feet in the middle. It is basically a dam on a creek and the overflow goes into the wood and streams. Since rebuilding it, it is covered with algae on the surface as well floating and some submerged algae. We intend to get 2-4 carps but also are considering planting trees on the south side to shade the pond (instead of using die which is expensive) and maybe add a fountain to increase oxygen infiltration, both of which are preventive measure. In terms of effectiveness, which one of these 3 factors are MOST effective: shade, oxygen, carp. There is nothing we can do about nutrients as we have no control over that.

  84. LEN CHRISTIE Says:

    on July 5, 2014 at 8:55 pm

    have a small pond covered with algae and plants most of the year, Oregon’s permit process seems extensive, so I am wondering if anyone can estimate the total cost to introduce perhaps 3 triploid carp into this pond??

  85. Mgannon Says:

    on August 16, 2013 at 3:27 am

    Contact your local Division of Fish and Wildlife. Thanks

  86. John McCormick Says:

    on August 14, 2013 at 2:10 pm

    I would like to buy 5 Grass Carp. How do I do that ??

  87. Mgannon Says:

    on May 21, 2013 at 11:15 am

    Hello Solomon, you would probably use about 3 carp. It is hard to say how long it will take for them to work their magic but they will do it, they are very effective! You need to contact your local Division of Fish and Wildlife to obtain these fish. Good luck and thanks for reading and commenting!

  88. solomon Says:

    on May 16, 2013 at 8:37 pm

    i have a small pond about half an acre an it has developed a cover of alge on top. a friend recomended i try carp how many should i get and also how long will it probbaly take for the carp to eliminate the alge on the surface if the pond?

  89. Mgannon Says:

    on April 17, 2013 at 11:10 pm

    Hello Bill, I do not sell the grass carp, but you should get in touch with your local Division of Fish and Wildlife to get these type of fish. They typically require a permit. Thanks for reading the blog!

  90. Bill Hannah Says:

    on April 15, 2013 at 1:53 pm

    Would like to purchase some grass carp. Can pick up if near by Or will receive by shipment.

    Can you tell how and where?

  91. Mgannon Says:

    on March 26, 2013 at 11:50 am

    Hello Marve! So you have seen firsthand how very effective grass carp can be in controlling or even removal of unwanted algae growth. Being fairly early in the season I would guess that the fish have not come out of dormancy just yet. I am not sure where you are located but, I’d give it a little more time before considering the addition on more grass carp. Thanks for checking out the LOVEYOURPOND blog and commenting! Regards, Mike

  92. Marve Colyer Says:

    on March 16, 2013 at 4:49 pm

    We bought six grass carp one yr. ago for our one acre pond (for our HOA). They did a fantastic job and true to nature went dormant for the winter—we now are having a lot of algae and grass growth that can be seen, but so far no carp to be seen—should we put some more carp in or be patient and let the weather warm a bit and see if they will “come and get it”!?! Thanx for your advice.—Marve Colyer

  93. Mgannon Says:

    on April 6, 2011 at 8:25 pm

    Hello Drew, try contacting your local Division of Fish and Wildlife, they can set you up with a supplier and provide the permits if they are required in your area. Thanks for reading the blog and commenting.

  94. Drew Hoffner Says:

    on March 31, 2011 at 11:33 am

    How do I buy Grass Carp?

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