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Thread: Information on KHV
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27-01-2019, 03:24 PM #1
Information on KHV
There is no one in the UK who is more informed on the subject of KHV than Paula Reynolds. Apart from her years of research, she has close contact with key organisations in Japan. To answer the call for information on KHV and the latest outbreak she has written a very informative article which includes full details on the best quarantine procedure. I’ve just uploaded it to her website in a question and answer format on the link below. To spread this as widely as possible, feel free to share it.
www.lincsfishhealth.co.uk/html/khv.html
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27-01-2019, 03:49 PM #2
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Manky Sanke Thanked / Liked this Post
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27-01-2019, 04:04 PM #3
No problem, I'm always glad to help Paula get her knowledge, experience and advice into the public domain. As it says in my post, please feel free to share the link and help spread the information.
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john1 Thanked / Liked this Post
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27-01-2019, 04:10 PM #4
Thanks Syd,where would we be in this wonderfull hobby without Paula and yourself to give advice.
Personally I feel frightened to buy in any koi at the moment but I really feel for the dealers who are having a real hard time of it.John
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Manky Sanke Thanked / Liked this Post
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27-01-2019, 04:41 PM #5
There is no need to worry if you buy koi from a dealer who will guarantee that they quarantine koi properly before they sell them or from one of the dealers who only sell on koi that they've bought from someone like Gatwick Koi who quarantines koi for them. If those koi aren't mixed with unquarantined koi from other sources, they also will be safe to buy.
I've heard stories from hobbyists that a dealer used the excuse that they don't quarantine new stock because that would stress them!!!!! Only consider buying from someone like that if you have the facilities to quarantine correctly and you don't mind the risk that you may find that your new purchase shows the signs of KHV when you quarantine it yourself and you have to euthanase it.
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27-01-2019, 05:31 PM #6
Thank you for sharing Paula's page Syd, that was interesting to read.
I do have a couple of questions purely out of interest, and these questions are for anyone that might be able to answer:
1) If all fish in an infected pond system are euthanized, at what point does that system become safe to add new Koi?
2) Paula states the following and I don't quite understand what it means:
"I have never suggested that heat ramping provides a guarantee of KHV free Koi, however, I have found the more chill – heat cycles healthy Koi are subjected to, the less likely they are to test positive for either exposure to KHV or for the carrier state."
Is she saying:
a) after being subjected to these cycles, healthy Koi are less prone to catch KHV even if having been exposed to carriers (which is how it reads to me)
or
b) If Koi remain healthy after being subjected to these cycles, they are less likely to be KHV carriers?
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27-01-2019, 06:36 PM #7
no, the koi already have, or dont have, khv before the heat cycles, the heat cycle is designed to bring it out, i think what shes saying is that its not a 100 % guarantee to always bring it out, and so while its highly unlikely, its still possible to have a khv koi that has been heat treated.
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27-01-2019, 07:07 PM #8
Also that one cycle often isn't enough to trigger latent KHV into its active phase so two or more cycles, with chilling in between, is better.
If KHV is found in a pond any survivors will be potential (almost guaranteed) carriers which will have the potential to infect any new fish added so, either they must be euthanased, or they must be kept in complete biosecure isolation.
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27-01-2019, 09:13 PM #9
I understand that to heat ramp will hopefully bring out Khv in a koi if a carrier and not to eradicate Khv if a carrier,but if going to a dealer you have to take the trust of that dealer if they say they heat ramp.
Not saying they wouldn't be telling the truth but how do you know?
I suppose the old saying to stick to one trusted dealer but I hold my hand up as I have bought from quite a few dealers in the last 25 odd years of keeping koi.
So if I was starting now I think I would stick to one reputable
dealer.John
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lee63 Thanked / Liked this Post
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27-01-2019, 10:08 PM #10
Thank you if this was in answer to my question, but what I meant was after euthanizing all Koi in the system, can new Koi be safely introduced into that system at a future date, i.e does the virus remain present in the water for a period of time and then die? Or is the only way around it to thoroughly empty and disinfect every component within that system?
The reason that question interests me is because if you just empty the pond into the drain (as I assume most people would), are you risking the spread of that virus into other water systems?
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lee63 Thanked / Liked this Post
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28-01-2019, 10:44 AM #11
As an angler also, KHV is a real concern. More outbreaks are being reported in fishing lakes and huge numbers of fish are getting destroyed.
I hope that this isn’t a dumb question, but all this waste water that has had infected koi swimming around in that then goes into the public sewers...is that a potential risk to our lakes and rivers?
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28-01-2019, 03:45 PM #12
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lee63 Thanked / Liked this Post
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28-01-2019, 03:53 PM #13
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JohnKitching, lee63 Thanked / Liked this Post
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28-01-2019, 05:03 PM #14
Although the CyHV-3 (KHV) virus has such devastating effects it's a very weak virus outside of its host. There are different opinions about how long the CyHV-3 virions (infectious virus particles) can survive without a host but the maximum survival time I've ever found from authorative sources is 19 hours so it's safe to assume that a period of two or three days without a host will ensure that none of the virions are still infective agents.
For the paranoid (like me) I would suggest cleaning every wet surface in the filter system with a standard kitchen bleach spray and then adding potassium permanganate to the pond at twice the normal rate. After a good water change and adding dechlorinator, the pond will be KHV free.
Waste water from an infected pond shouldn't be allowed to get into rivers, streams or other natural bodies of water for obvious reasons. However, as for the virions getting into the sewage system if the waste water is poured down the drain, yes, that could happen but the virions would only survive if there were carp in the sewers that could survive the poor water quality.
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28-01-2019, 06:16 PM #15
Thank you Manky, that was a comprehensive answer and has really helped my understanding, and others too I hope.
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Manky Sanke, lee63 Thanked / Liked this Post
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28-01-2019, 11:04 PM #16
Yea, thanks Syd. Kinda setsmy mind at rest.
I read the other day that Kevin Nash has given 20k towards KHV research.
Wouldn’t hurt some of the other big tackle empires to do the same cause if there’s no Carp they’ve no customers.
Angler’s can do their bit too obviously, disinfecting and drying nets etc.
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Manky Sanke, lee63 Thanked / Liked this Post
Best plants to remove Nitrate
pug has a very impressive veg filter on his pond, have a look at some of his his youtube videos....