Help! Sick Koi?

[soaresl2]

Hi, hope someone can help me figure out what's up with a couple of Koi I have. I have about half a dozen, all seem fine apart from two (please see pics).

One is a small green Japanase Koi (so I'm told) which I've had about eight months. About a month ago he developed a light grey patch with blackish edges. Doesn't seem to be clearing up. The other is a larger silver Koi which last week developed a pinkish cresent on the top. I've had it for a few years and he's not had it before.

The pond is about a year old, with UV & filter & I replace some of the water regularly; it looks clear anyway. All fish, including these two, are quite lively and seem healthy.

I hear the wrong treatment is worse than none; could someone advise me what might be up and how to treat?
Thanks, ...Leo

[saratogatan]

the 'green' koi is a chagoi, or tea-koi. I am not sure what that patch is. I think it is best that you net it and take a better look, also take a closeup photo. If I were you, I will feel it with my finger, and try apply Hydrogen-peroxide over it and see what happen. There is a good chance the white stuff is sap.

The red mark is on the doitsu is a strong sign of parasite invasion. Net the koi and take a close look. It should be treated the same way you address wound on you leg. I have no experience on treating would on doitsu, I will leave it to others.

stan

[Russell Peters]

The red on the Doitsu Koi is an infection under the large scale. It is best to clean it out and disinfect it. I use a cuetip and mercurachrome. Once you have done that I would use another cuetip and swap some Lamisil under the scale to try to keep out the infection. Keep an eye on it to see if it worsens.

Both the problems with you Koi are a sign of water quality problems.

[saratogatan]

Russ,
Do you know if those scales on doitsu grow back after they are lost ? lokking at the photo, the area below one of those scale is almost completely
infected, it is very likely that the scale get dislodged with wound treatement.

stan

[jnorth]

It's been my experience that the large german scales on doitsu do not grow back at least the ones along the lateral line. Not sure along the dorsal.

Leo, It looks like you have a problem for sure. Can you tell us more about the pond itself? Type/size of filtration? Total gallons of water in pond? The amount of fish? Clear water is not an indication that the water is good so can you give the ph, kh, gh, nitrate, nitrite and ammonia levels? Do you have a microscope? Roughly where do you live as there may be a KHA that lives nearby that can help you out in person. And finally the water temperature.

[JanT]

I would basically agree with Russell. Just do not get the mercurachrome anywhere near the eyes, gills, mouth of your koi. It will kill. Apply with care ONLY to the area in question.
Good advice to find the nearest Koi Health Advisor and ask for assistance. They will have a microscope to find exactly what is causing your problems. Then it can be treated with other medicines if need be.

Best of luck.

[Russell Peters]

Quote: Originally Posted by saratogatan Russ, Do you know if those scales on doitsu grow back after they are lost ? lokking at the photo, the area below one of those scale is almost completely infected, it is very likely that the scale get dislodged with wound treatement. stan

No, once they are gone that is it.