fatal mistake?

[TaishoSanshoku]

I appeal to your experience, I have submerged a pump from a pond contaminated with ich, white spot, (before knowing it logically), to another healthy one, just rinsing it a little with running water routinely, the contagion occurred 100% safely?
in how many days could the symptoms begin being in spring?
thank you very much.

[RichToyBox]

You may or may not have created a problem. Ich has three stages of development. The one that we see is an encysted form where it grows and develops into an egg of sorts that comes out of the fish and drops to the bottom of the pond. In the encysted form it is not able to go anywhere, staying deep in the skin of the fish. The egg form should be readily washed off of any equipment, if it was given any hosing, and I would expect very small numbers if it were not hosed. The egg then hatches into a swimming form that swarms up trying to find a host to encyst in. I would not expect the swimming form to be able to withstand the hosing of the pump or even the draining of the pump in the process of moving it.

If any were to move the normal life cycle is from 2-5 days in warm waters and up to 5+ weeks in cold waters. As you are just coming into spring, I would expect it will take several weeks before you will see any cysts on any of your fish.

[TaishoSanshoku]

Thank you, do you recommend preventive treatment or do you recommend waiting to confirm symptoms?
Can ich survive out of water?

[RichToyBox]

I believe the egg form can survive out of the water, but not sure. I would just wait and see. Instead of any of the marketed treatments, if it is ich, I would salt the pond to 0.3% and keep it that way for a couple of weeks, but only after assuring that it is ich. Some of the other treatments for some of the other parasites recommend not using with salt.

[TaishoSanshoku]

I believe the egg form can survive out of the water, but not sure. I would just wait and see. Instead of any of the marketed treatments, if it is ich, I would salt the pond to 0.3% and keep it that way for a couple of weeks, but only after assuring that it is ich. Some of the other treatments for some of the other parasites recommend not using with salt.

Hello Richard, today is 12/22 and it has been a long time since the possible contamination with ich from the large pond, my question is, if they had been infected, all the koi should already be with their entire body and fins completely covered with ich, right ?

[RichToyBox]

If the fish are acting normal, no flashing, no breaching, no sores, no isolating, no piping, I would say that the numbers if any will be very low and not a problem.

[TaishoSanshoku]

Thank you very much Rich, here we are in summer now, with maximum temperatures between 26 and 31 degrees Celsius and minimum temperatures between 17 and 25 degrees Celsius, to completely rule out the possibility of ich infection, if they do not present the symptoms that you have well described, how many days should I wait for see them entire covered by white spot or rule out the disease?

[RichToyBox]

It is hard to see the white spots on koi, so seeing them covered would be difficult at best. With a microscope, it is fairly easy to see on a scrape slide, and if not present, I would consider cured. If no symptoms at your temperatures for two weeks, I would consider the disease stopped. At these temperatures, I believe the complete life cycle is less than a week.