Koi , although extremely good swimmers and jumpers, when it suits do not normally exhibit this type of behavior as a matter of course. Remember that it is normal however for your Koi to scratch or itch themselves.
If on the other hand all the pond fish are doing this at the same time then something is wrong.
When a Koi carp is seen jumping it is normally for one of the following reasons:
- They are trying to get more oxygen into their gills.
- A jumping Koi may be the end result of a parasite infection or as a result of gill filament damage.
- Fish ponds with excess heavy metals, such as Copper and irritating chemicals such as chlorine, will sometimes manifest itself in your Koi jumping.
- During the mating season and when spawning, Koi can be seen jumping with joy. A tell tale symptom however will be foaming on the pond surface and eggs.
- Poor pond water quality problems such as excess TDS (Total Dissolved Salts) may cause your Koi to jump. You are more likely to see them swimming erratically, lifting their heads out of the pond water or scratching or itching themselves against the pond walls (flashing).
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