Ellobiopsidae or Cladogonium ogishimae. Green Fungus in Shrimp Tank.

Ellobiopsidae and shrimp

One of the major problems in breeding Neocaridina davidi shrimp in Taiwanese aquaculture ponds are Epibionts such as Cladogonium ogishimae. Unfortunately, in most cases, this parasitic alga on freshwater shrimp are usually confused with Ellobiopsidae. However, the good thing is that possible treatment remains the same.

The parasite can be found on the body of the dwarf shrimp as “green fungus”. These organisms affect shrimp wellbeing by causing distress, which leads directly to shrimp weakness, loss of color, and eventually death.

Lack of effective treatment due to the relatively small knowledge of parasites found in freshwater shrimp farms may result in escalating of the problem in the future. Additionally, the trade of dwarf shrimp poses a significant risk for the unintentional introduction, establishment, and spread of incidental “hitchhiking” parasites. 

About Cladogonium ogishimae

Microscopic analyses indicate the presence of several freshwater shrimp epibionts. Some of them show a parasitic lifestyle, for example, as Cladogonium ogishimae. Unlike Scutariella japonica and Vorticella, which usually root at the rostrum of the shrimp, Cladogonium ogishimae occupies mostly the bottom of the shrimp. Especially on the pleopods responsible for incubating shrimp’s eggs.

Cladogonium ogishimae has a filamentous body as small as 1-2 mm. It stands upright and has branches. All of the vegetative cells are colorless, but the zoosporangia and the zoospores are furnished with many green chloroplasts.

Cladogonium ogishimae proliferates through these zoospores, which are mobile and can infect the new shrimp with the ectoparasite. If the spore containers are visible, the infection is already well advanced.

Cladogonium ogishimae or Ellobiopsidae in Shrimp Tank?

I do not want to be a myth-buster but I have my serious doubt that most of the shrimp breeders are correct when it comes to identifying this parasite.  

I have read like dozen different studies about Ellobiopsidae (You can see them at the end of the article. Most of them you can find online for free.), and I am going to give you a short review about this parasite and compare it with Cladogonium ogishimae.

Ellobiopsidae

Ellobiopsidae structure It is multinucleate parasites of aquatic crustaceans that possess a nutrient absorbing “root” inside the host and reproductive structures that protrude through the carapace. Ellobiopsidae have variously been affiliated with fungi, “colorless algae”, and dinoflagellates, although no morphological character has been identified that definitively allies them with any particular lineage.

Ellobiopsidae appears as “cysts” or “tufts” of tissue on the mouthparts, antennae, or carapace of infected crustaceans, though closer scrutiny reveals that the parasites penetrate into the interior of the hosts to varying extents.

By infiltrating the host’s nervous or gonadal tissues, Ellobiopsidae infections can cause host sterility and/or alteration in behavior and endocrine function. Furthermore, the presence of Ellobiopsidae may suppress molting through endocrine control of the host. It is more likely that increased mortality resulting from infection, starvation, and inability to molt.

Ellobiopsidae on top of the shrimp

According to the biologists, this is without a doubt, some of the strangest looking organisms. It is not possible to sort it into the known plant, animal or fungal groups. The parasite is like “partially everything”. Presumably, it spreads by spores.

Their phylogenetic affinities and taxonomy are largely unknown.
Whether reproduction is sexual or asexual is unknown.
The length of “life” of the internal portion of the parasite and its seasonal presence is unknown.

Difference between Ellobiopsidae and Cladogonium ogishimae

As we can see scientists do not know almost anything about Ellobiopsidae. Therefore, it can be problematic to compare different parasites. (Especially, when the biologists do not know much about Cladogonium ogishimae as well :D). However, several things supposedly can make the whole difference for us.

  1. Ellobiopsis infect a wide array of pelagic marine crustaceans. There are some notes that it also can infect freshwater copepods but on the whole, it was usually registered in seas and oceans.
  2. Ellobiopsidae usually penetrates the host from the top.
  3. I have not read in any report that Ellobiopsidae can turn green.

I am not a biologist and I do not want to prove or claim anything here. This is just my subjective comparison.

What I think is that a long time ago some aquarists tried to find the scientific name for this parasite. During their research, they came across Ellobiopsidae, which has more or less similar symptoms. After that people simply started repeating this name without analyzing it anymore. Actually, it is hard to blame anybody, because we hardly have any data about these parasites at all.

Personally, I believe that we have a huge misunderstanding and confusion. In reality, we deal with Cladogonium ogishimae because it:

  1. Infects freshwater shrimp (There are few studies about it).
  2. Cladogonium ogishimae stays on the bottom of the shrimp.
  3. Becomes green, eventually.

 Once again, this is my opinion based on studies of freshwater shrimp in Japan. However, because these two parasites are not studied well, I will still refer to both of them in this article. They can have a different structure but the attempts of treatments are the same in each case.  

How to identify Cladogonium ogishimae. The symptoms?

Cladogonium ogishimae structureUnfortunately, it is very difficult to identify this parasite at early stages due to the lack of color. When it is small, it is almost colorless. The fact that it also occupies the bottom of the shrimp (pleopods) makes this even harder to recognize.

That is why if you see the yellowish-green spores of the shrimp algae under the abdomen, it means that the shrimp have been infected for a long time.

It grows at various stages and branches actively. Most of the branches consist of one cell. One “root” can have more than 15 cells. Some of these cells become remarkably long while being colorless. There are two types of cells on the root:

  • Vegetative cells (colorless).
  • Germ cells (exhibit yellowish-green to green color).

The infestation is not visible until very late. When the algae start parasitizing in the muscle tissue of the shrimp, the germ cells begin to form their greenish spore container. Typically, “Green fungus” sits between the pleopods, where the shell of the shrimp is thinner and thus more consistent for the ectoparasite. Only very rarely one can discover the typical branched appendages also at other parts of the body of the shrimp.  

Is Cladogonium ogishimae dangerous to the Shrimp?

The short answer is definitely yes! The parasite inhibits their movement activities by infiltrating into the muscles of the abdominal part of the shrimp. As a result, shrimp cannot get enough nutrition. At some point, shrimp can barely move. With time the affected shrimp become weaker and eventually dye.  In addition, it becomes impossible to mate for the shrimp. The spores “Fungus” prevents oviposition in the female shrimp. All in all, if left untreated, the parasite may progressively affect the entire population of the shrimp colony.

According to researches, it infects Neocaridina, Caridina, Paratya, and Macrobrachium. However, warmer temperature increases its activity, which makes Neocaridina the most common target in shrimp farms.

Note: According to shrimp breeders observations Ellobiopsidae infects only Neocaridinas. Well, it is really hard to say. Maybe the parasite does show some “preferences”. Maybe it is just a coincidence or the effect of the temperature, which makes the difference. In this case, it might show us once again, that we are dealing with Cladogonium ogishimae. 

Name Cladogonium ogishimae

or (and)

Ellobiopsidae

Type Parasite
Threat level Very High
Treatment difficulty Difficult
Treatment efficiency Not 100%
Treatment length 1-30 days 

The Ways of Infestation in Shrimp Tank

  1. The mobile flagellated zoospores that secrete the parasitic algae infest the shrimp. These zoospores can infest and infect new shrimp, either when they are picked up from the ground and eaten, or when they sit outside of the shell and drive their root through thin armor pieces into the muscle tissue.
  2. Similar to a bacterial infection. When the other shrimp eat the dead infected shrimp.

Ellobiopsidae on the shrimp

Possible causes of Infestation in Shrimp Tank

Supposedly poor water conditions and dirt are the main reasons for infestation.

Cladogonium ogishimae is a secondary parasite that strikes when the shrimp’s immune system is weakened, whether due to stressful transportation, improper habituation, inappropriate water levels, high bacterial load, improper feeding, and other stressors.  

Cladogonium Ogishimae and Ellobiopsidae Treatment.

Only a few years ago it was absolutely not possible to save the infected shrimp. However, thanks to shrimp breeders who attempt to resolve this issue we now have some possibly successful treatments. 

I would like to start off by saying that keeping shrimp in the dark will not work. The thing is that I have already mentioned that this parasitic alga does not contain chlorophyll (Chlorophyll is essential in photosynthesis, allowing plants to absorb energy from light and turn them green). However, it gets almost everything from the shrimp (feeds parasitically). 

Copper treatment

This is one of the most popular methods to treat algae in fish aquariums. Copper binds to algae, damages its cells, causing them to leak and die. The only problem of the copper is that it is extremely dangerous to the shrimp. Even more, too much copper is toxic to plants as well, because it prevents photosynthesis.

According to aquariumwiki the dangerous level of copper for:

  • shrimp is 0.03 mg per liter.
  • algae and bacteria is 0.08 mg per liter.
  • some fish, snails, and plants is 0.10 mg per liter. 

It seems like that shrimp will not survive the treatment.

You can read more about “How Copper Affects Dwarf Shrimp” right here.

Kordon Rid Ich Plus. Malachite green treatment.

Kordon Rid Ich PlusAnother way to treat these parasites was proposed by Chaz Hing (Chaz Hing has a bachelors degree in chemistry from the University of Delaware. He is the passionate shrimp breeder and founder of ElevateShrimp.com).

Note: In his study, he is referring to this parasite as Ellobiopsidae. At the same time, he also says that “I could only find information on the marine family of ellobiopsid”.

Presumed dosage and usage:

  1. You need to find a food that the shrimp can eat fast. Pelleted snowflakes are an excellent choice because they are available by many pet shops and also because they are extremely dehydrated so it will easily adsorb liquid medication.
  2. Buy a bottle of Kordon Rid Ich Plus for protozoans. It consists of 4.26% formaldehyde and 0.038% zinc-free malachite green chloride.
  3. Put a few pieces of the pelleted food onto a dish and drip Kordon Rid Ich Plus onto the food until it expands and cannot accept any more. Tip: start from 2 mL of Rid Ich Plus per 1 gram pelleted snowflakes. Add more Rid Ich Plus until the food becomes soft. Do not add too much. The food does not have to be completely saturated. It is normal for this process to take an hour or so for the pellet to absorb the chemical and fall apart. Keep in mind that different brands have varying densities so the absorption duration will vary.  
  4. Let the (now powdery) snowflake food dry completely to lock in the medication.
  5. Treat infected shrimp with this medication for over a week.

Keep in mind:

  • The method will not give you 100% success rate. In case of heavy infection, Chaz Hing recommends quick euthanization of the shrimp. They will not be curable by any means.
  • Quarantine infected shrimp as fast as possible.

Note: Unfortunately, the use of malachite green in aquatic ponds is banned in the EU as malachite green accumulates in food fish and could enter the human food chain. 

Kordon Rid Ich Plus (check the price).

Other Malachite Green Products

It looks like malachite green is quite effective against Ellobiopsidae or (and) Cladogonium ogishimae. Therefore, if you cannot get Kordon Rid Ich Plus, you can try your chances with some other variants.

Medicine Malachite Green ProductsIn my article about “Shrimp Vorticella Parasite. Treatment” I also refer to the list of well-known medicines, which contains malachite green, such as:

Hydrogen Peroxide (H202) Treatment

Hydrogen PeroxideAccording to Marks Shrimp Tanks it can cure “the green fungus”. This is a very promising remedy; just make sure that the dosage is correct. Check and double-check your calculations!

The medicine is very strong and if you do this wrong there is a high risk that you will kill all your shrimp. I have found that the safe level is 14.3 ml/l H2O2/L, approximately 50 % of the largest applied dose that caused no mortality (NOAEC), which was 29 lL H2O2/L. (“Short communication: Acute toxicity of hydrogen peroxide in juvenile white shrimp Litopenaeus vannamei reared in biofloc technology systems” Plinio S. Furtado, Fabiane P. Serra, Luis H. Poersch, Wilson Wasielesky Jr. Aquacult Int (2014) Received: 6 March 2013)

  1. Calculate the size of your tank (take into consideration decorations, driftwood, stone, substrate, etc, at least roughly).
  2. Turn off filtration (unless you have a sponge filter).
  3. Dose 1.5ml per 4.5 liters (~1 gallon)
  4. Wait 1 hour
  5. Turn the filter back on 

Hydrogen peroxide (link to check the price on Amazon).

Almond leaves treatment vs “Green fungus”

On the internet, I came across an interesting post. One of the shrimp breeders said that he cured the shrimp with the almond leaves and a few alder cones.

  1. Put the infected shrimp in a small bucket with maybe a few inches of water in it.
  2. Add in 3 or 4 small almond leaves and a few Adler cones to get tannin-rich water.
  3. Do 50% water changes every day and only feed it a small piece of algae wafer every other day.
  4. After 2 weeks, the “fungus” will be going down.
  5. Two weeks later, it should be completely gone.

It is really hard to say, but this method is worth a try. It is a well-known fact that Indian Almond Leaves have antifungal properties. Maybe the high concentration can really help in this case.  

Quarantine for diseased shrimp

It is best to set up a quarantine tank for the infected shrimp as to not harm any other inhabitants within your aquarium.

Quarantine is very important when you are buying new shrimp. You need to be sure that they do not have anything so the parasite will not spread and contaminate the rest colony. Even if they appear healthy, it is not the case with imported shrimp a lot of the time.

Get a magnifying glass to close examination of the shrimp. Also, if you are buying a homebred shrimp, do not automatically assume that they are disease-free. Unfortunately, a lot of people buy imported shrimp and resell them as homebred.

The quarantine tank should not have any substrate to prevent re-infection with spores.  

A filter can be counterproductive because spores could accumulate in the filter material. Because of that, you will need to do 30-50% water changes every day.

Tip: The substrate in the main tank should be thoroughly vacuumed several times as well. You need to do that in order to eliminate as many of the spores as possible before other shrimp can get the parasite.

For more information, read the article “How To Setup an Easy Quarantine Tank”.

In Conclusion

Ellobiopsidae or (and) Cladogonium ogishimae are very dangerous parasites. There are not enough researches about them. Therefore, we do not know how to treat them efficiently.

There are several methods, which presumably can remove the parasite. However, nobody can guarantee the result.

Read also my article “Understanding Dwarf Shrimp Diseases and Parasites”.

Literature about Cladogonium ogishimae

  1. Epibionts of ornamental freshwater shrimps bred in Taiwan. August 2018
  2. A Colorless, Filamentous Chlorophyceous Alga, Cladogonium ogishimae et Sp. Nov., Parasitic on Fresh-water Shrimps. Hiroyuki HIROSE, Masaru AKIYAMA. 1971 Volume 84, Issue 993, Pages 137-140
  3. Kazuyo Matsuyama-Serisawa1, Tadashi Imai2, Masayuki Nakaso3 and Yukihiko Serisawa1. Reconfirmation of Cladogonium (Chlorophyta, Cladophoraceae) being ectoparasitic on freshwater shrimp. Jpn. J. Phycol. (Sôrui) 62: 1-6, March 10, 2014

Literature about Ellobiopsidae

  1. Ellobiopsids of the Genus Thalassomyces are Alveolates. in Journal of Eukaryotic Microbiology. March 2004
  2. First record of the occurrence of an ellobiopsid Thalassomyces marsupii Kane on a new host of hyperiid amphipod in Japanese waters. In Plankton Biology and Ecology. August 2004
  3. A quantitative review of the lifestyle, habitat and trophic diversity of dinoflagellates (Dinoflagellata, Alveolata). Article in Systematics and Biodiversity. September 2012
  4. The crustacean parasites Ellobiopsis Caullery, 1910 and Thalassomyces Niezabitowski, 1913 form a monophyletic divergent clade within the Alveolata. Article in Systematic Parasitology. October 2009.
  5. Sudden appearance of cysts and ellobiopsid parasites on zooplankton in a Michigan lake: A potential explanation of tumor-like anomalies. in Canadian Journal of Fisheries and Aquatic Sciences. August 2000
  6. Exotopic protrusions and ellobiopsid infection in zooplanktonic copepods of a large, deep subalpine lake, Lago Maggiore, in northern Italy. in Journal of Plankton Research. June 2004
  7. New Hosts, Prevalence, and Density of the Ellobiopsid Parasite Thalassomyces Fagei on Euphausiids in Prince William Sound, Alaska. in Journal of Crustacean Biology. May 2000
  8. Widespread occurrence and genetic diversity of marine parasitoids belonging to Syndiniales (Alveolata). in Environmental Microbiology. October 2008
  9. Symbiosis of planktonic copepods and mysids with epibionts and parasites in the North pacific: diversity and interactions. January 2011
  10. Ultrastructural features of the basal Dinoflagellate Ellobiopsis chattoni (Ellobiopsidae, Alveolata), Parasite of Copepods. January 2014
  11. NEW RECORDS OF ELLOBIOPSIDAE (PROTISTA (INCERTAE SEDIS)) FROM THE NORTH PACIFIC WITH A DESCRIPTION OF THALASSOMYCES ALBATROSSI N. SP., A PARASITE OF THE MYSID STILOMYSIS MAJOR . BRUCE L. WING. 1975
  12. The parasitic dinoflagellates of marine crustaceans. Annual Review of Fish Diseases Volume 4, 1994, Pages 241-271

28 thoughts on “Ellobiopsidae or Cladogonium ogishimae. Green Fungus in Shrimp Tank.

  1. This is the best breakdown of this issue I have seen. Thank you

    1. Hi Rachel,

      It is an honour to hear it from you!
      And thank you sooo much for your Youtube channel!

      Best regards,
      Michael

      1. Hi Michael,
        Please send me a mail and then you get a Update on a Way to solve this issue.
        In Germany there are some articels where it is described.
        Thanks
        Matt

        1. Hi Matt,
          Sure, I will do it.
          I check regularly for more information regarding these parasites. Unfortunately, there are no changes yet.
          Best regards,
          Michael

  2. Hello Michael,

    thank’s for this article. It is the most complete in the net. I don’t find the date of his creation. Can you tell us when you wrote it, please? Thank’s again sire.

    1. Hi Leo,

      I wrote it approximately 6 months ago. As far as I know, there is no new information about Ellobiopsidae or Cladogonium ogishimae. I check it from time to time to update.

      Best regards,
      Michael

  3. Thank’s a lot.

    In France, it seems to me that anyone has tried metronidazole?
    Do you know if it is the same case in England? in Europe? in Asia?
    Perhaps, it will be the good medication, but like you i don’t find any informations on it.

    Also, do you know if a strong concentration of sea-salt was try by someone?

    leo94

    1. I do not have any information about Metronidazole.
      All I know is that Seachem has a MetroPlex (70% Metronidazole). It treats protozoan parasites and anaerobic bacterial diseases of fish. They also said (on their forum) that it should not harm shrimp.
      Nonetheless, I have not heard that anybody used it against Ellobiopsidae.
      Maybe it is worth a try.

      Regarding sea-salt.
      If this parasite is Ellobiopsidae, it will not help because according to my research, Ellobiopsidae was usually registered in seas and oceans.
      If this parasite is Cladogonium ogishimae, I do not think that it will help as well, because Cladogonium is quite resistant.
      Unfortunately, we need more data and researches about it.

      Best regards,
      Michael

  4. I spoke about Cladogonium of course.
    We should make these tests before make any pronostics (with metronidazole, with salt, and the both, why not?)
    I can’t do them because i have no shrimp actually and no metronidazole too.
    I hope that someone makes some.

    Thank’s a lot Michael
    I hope you the best
    leo94

  5. hi Michael, Is there a way that i can get incontact with you?

    1. Hi Destiny,
      Sure, I’ve sent you my email.
      Best regards,
      Michael

  6. Hello!
    Thank you so much for your break down of this problem! I’ve just run into Cladogonium ogishimae myself and am working on solutions. However, my aquarium is a community and I’m curious whether this fungus could negatively affect my other freshwater fish and/or humans (say if cleaning the tank and I come into contact with the spore)?
    Thanks again!

    1. Hi Jocelyn,
      All I can say is that I have not seen any reports that Cladogonium ogishimae can affect fish or humans.
      In addition, even though shrimp keepers have been using another name (Ellobiopsidae) for this parasite for a decade – nobody has had any problems in the fish tank.
      Best regards,
      Michael

  7. Michael,
    Excellent analysis and summary of a lot scientific descriptions and homegrown possible remedies. Is there any known life cycle timeline as to when you may be in the clear. Started with 10 juvenile RCS in a quarantine tank. All appeared fine and transferred to display tank. Once they reached mature size 2 were badly infected with Cladogonium ogishimae. Green underbelly. I made a quick decision to remove and euthanize as no remedy was apparent for late stage infection. I also quarantined the tank and nothing in or out was shared by any other tank. Now 3 months later there has been no other signs of infection and the colony has successfully multiplied many times over. Am I in the clear and able to move shrimp to other tanks and or share??

    1. Hi Mark McMillan,
      Sorry that I could not answer earlier.
      I keep checking for new information on Cladogonium ogishimae, unfortunately, so far I do not have any news.
      Personally, I would consider it is safe to add new shrimp if you have not had any signs of these parasites for 3 months.
      However, I need to repeat that there is not enough knowledge about it.
      Best regards,
      Michael

      1. Hi Michael thanks for a well put together article, question, can Ellobiopsidae grow through the pleopods or is it definitely only on the outside

        1. Hi Richard,
          Unfortunately, these parasites can also stick and grow through the pleopods.
          Best regards,
          Michael

  8. Thank you so much for your thorough discussion of this issue. I’ve only just started keeping neos and thad 2 shipments come in the same week with scutariella, rust disease, and cladogonium…I had to learn fast and your website is invaluable!

    I’m wondering if you have heard how long people normally treat cladogonium with peroxide?

    I’ve been doing daily treatments followed by 50% water changes for a week. There was only one who was badly infected but the others look fine through the macro lens. The shrimp don’t seem to be bothered by it but I don’t want to cause any unnecessary stress.

    Thank you!

    1. Hi Lyndsay,
      Thank you!
      For more details, you can as Mark about it. He came up with this idea.
      As far as I know, if there were no results after 3-4 treatments, people usually stopped because there was no hope for the shrimp anymore.
      In any case, the efficiency is not very high anyway.
      This is one of the worst parasites we can have in our tanks.
      Best regards,
      Michael

  9. Michael,

    I modified the suggested method of using Kordon Rid-Ich Plus for a Cladogonium infection for two of my Green Jade Neocaridina. Rather than putting it in the food, I set up a Lee’s Specimen Container inside the tank with a few sprigs of pearl weed, an oak leaf and a couple of red root floaters; measured the capacity (3 cups) and scaled the dosage of the Rid-Ich Plus to this amount of water, which ended up being 1.9 drops (I used 2 drops!) using a disposable Pasteur Pipet. I rotated the shrimp each day into a second container with fresh water and retreated, washing out the used one to prepare it for the next day, and not using any of the tools/net that were used to move everything each day for anything else. I have been doing this for the past 3 weeks and the lesser affected shrimp has completely recovered and I have moved it back into the tank (but will be keeping a close eye on them all). The second shrimp had a much more severe infection – I didn’t think it would make it. It did show signs of improvement, but when it molted much of the residual infection came off with the molt, which I removed immediately. There is very tiny bit that is left between the first and second pleopods although very hard to see and he is still under treatment, but it’s looking very promising that he will make a full recovery. This particular shrimp is a Green Jade Rili so it is easier to visualize his undercarriage and the status of the infection. Whether they stay recovered is yet to be seen, as well as whether any of the others in the tank will come down with it. When I first got these shrimp about a year ago, there was one who had it and I immediately isolated and tried to treat her with salt but she didn’t make it. I am wondering if this organism is able to stay dormant in the tank? The affected shrimp this time were progeny (F1 or F2) from the original group. So either it is able to enter a dormant period and re-emerge or this is a brand new infection. I have not added shrimp to this tank since the original group was purchased. This is just my experience. I am pleased that something seems to be working, at least in my hands, and hoping this might help others. Thank you for the information.

    1. Hi Susan Murphy,
      Thank you for the feedback!
      I am sure that other shrimp keepers will thank you as well!
      Best regards,
      Michael

    2. The second shrimp has also now fully recovered!

      1. This is awesome!
        Thank you for the feedback!
        Best regards,
        Michael

  10. Could you please adjust your article to say “14.3 ml/l of 3% H2O2 solution”. Your article reads like you mix 3% solution 50-50 with water.

    1. Hi Chris,
      Thanks for correcting me!
      It was a misprint.
      Best regards,
      Michael

  11. Hi Michael, I was wondering if it would be possible for Susan Murphy to make a video about the procedure that she used I had a red Riley shrimp come up with some sort of fungus. It was yellow and around the palea pods so far I haven’t seen any other shrimp with any symptoms, but I know that fungus can hang around for a long time as a spore, waiting for an opportunistic host. I had taken the red Riley out immediately and tried her in a bucket with water and leaves and alder cones but I think that I made it too strong and she passed away would really appreciate being able to see this procedure. Thank you.

    1. Hi Ann,
      I will try to contact her and let you know how it goes if she answers.
      Best regards,
      Michael

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