All of my koi fish were dead when I went out this morning, what possible...

girlygirl

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...explanations are there? A few months ago, we lost most of our koi fish (about 10) to a parasite. They died one by one and we managed to get the parasite under control. This morning when we went out, the rest (6) were dead. They were fine yesterday. We put in a plant into the koi pond about two weeks ago, there were fireworks last night in the area and a big storm this morning. Are there any possible explanations in this occurrences? Any advice would be appreciated.
Sorry, I probably should have mentioned this but I live in South Africa. We're in summer at the moment and the maximum temperature yesterday was 34 and the overnight temperature was about 20 degrees celcius.
 
im guessing that the fire works debree got in the water
and then more came in with the storm
 
A sudden/drastic change in water temperature is a common cause multiple fish deaths.
 
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