Thread: Mixing Israli koi with Japanese

I have been contacted by a late friends wife who has only just told me he had a koi pond, she has covered the pond over with a tarpaulin.
But she wants to sell the koi on, 1 I explained its the wrong time of year to move them. 2 I said you wont get much for them as they are not worth a lot to someone else.
3 She then told me where they purchased the koi from and I happen to know they only sell Israli koi, so I explained that I was led to believe that you should not mix due to them being vaccinated for khv.
Your comments I look forward to reading.

Ian

Originally Posted by ianoak999

I have been contacted by a late friends wife who has only just told me he had a koi pond, she has covered the pond over with a tarpaulin.
But she wants to sell the koi on, 1 I explained its the wrong time of year to move them. 2 I said you wont get much for them as they are not worth a lot to someone else.
3 She then told me where they purchased the koi from and I happen to know they only sell Israli koi, so I explained that I was led to believe that you should not mix due to them being vaccinated for khv.
Your comments I look forward to reading.

Ian

1) biologically speaking it's a stable time of year to be moving carp (including koi). They are poikilothermic so essentially slow down in colder temps. This means there is less liklihood of say oxygen, or lack of, causing issues. As long as both environments are similar (in terms of WQ and temp) there is minimal risk. However, as they'll be functioning at a reduced rate there is a risk that if they are introduced to an environment with, let's say parasites, that they won't be 'strong' enough to stand up.

2) price is subjective. Jap fish fetch more than those from elsewhere. Its a simple supply and demand equation. Not many people will be looking to buy at this time of year

3) carp are carp. If they are from Israel or Japan they are fundamental the same genetically. KHV can be devastating to carp and fish can carry without displaying outward signs of infection (although most show clear signs such as gill necrosis). Its largely tempreture dependant and is less "noticeable" as temps fall. Is there a risk they could carry and infection other fish? Yes, certainly. Is it likely? Not really. If they been OK and shown no clinical signs of infection over summer this risk is relatively low. There are now good fish coming from Israel. Would I buy one? Yes I would if it'd been through the right quarantine. As always Caveat emptor! You pays your money and you take your chance
Remember koi don't know where there from. There isn't likely to be a Israel vs Japan war in your pond

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Shouldn't be a problem, if they all speak English..

I have mixed them over the years never had a problem, my understanding is that the Israel koi are vaccinated and stops them becoming sick with KHV but does not make them immune and could carry the virus, Japanese koi can be heat ramped during the quarantine period to expose any fish infected with the KHV virus.
Please correct me if I am wrong about this

.

As well as the issue of KHV, it is interesting to learn about the measures taken to combat sleeping desease in different countries.
As mentioned elsewhere, almost all KOI bred in Japan are intentionally exposed to infection as fry and shipped after gaining immunity.
※This means that immunisation against sleeping deaase is inevitable in Japan and South-East Asia,

However, we have not heard of any particular problems occurring even if they are mixed with KOI bred in Britain.
I have also heard that there seems to be a difference in sleeping sickness infection depending on the water quality in each country, but what do you think?

There does not seem to be much talk in the UK or Europe about sleeping desease, but there is some mention of Carp Edema Virus Disease, or CEVD. Do these only occur in farmed carp and are they unrelated to ornamental KOI?