Koi continue to die

[sissy]

One reason I got my 12 port aerator was the fish were getting bigger so magzire s right .Heat and warmer water can cause an even bigger lose of oxygen along with plants using up oxygen at night

 

[Faebinder]

My fish die from arsenic poisoning!
We built a bridge out of pressure treated wood to shelter the fish from the Heron, (we didn't know any better) every time it rained, arsenic leaked in the water
After the first few died we decided to pay for an autopsy, we then removed the bridge and changed all the water but still the damage was already done, and one by one all my fish died

This is a good post example of what could have happened to the pond.... it’s possible that someone is spraying their nearby yard with antiweed material that is getting to the pond via air. This is a pond so water is not being changed much like a river... pollutants from near by pile up.

Do you spray anything in the area?

 

[sissy]

Also said heavy rains happened before this all started .But the you never know .