What country are you in?
How long has the pond been set up for?
How long have you had the fish for?
When did they first start dying?
Have you added any new fish or plants in the few weeks before this started?
Have you tested the water for ammonia, nitrite, nitrate and pH?
Does the pond have a filter?
If yes, how often and how do you clean the filter?
When was the last time the filter was cleaned?
Have you done a water change on the pond recently?
How often do you normally do water changes on the pond?
Do you use mains water or well water on the pond?
If using mains water, do you dechlorinate the new water?
Have you got any pictures of the fish?
What symptoms do the fish have?
Has it rained recently?
Has anyone sprayed or fertilised near the pond?
What country are you in?
UK
How long has the pond been set up for?
Years but had decent water changes last summer owing to algae.
How long have you had the fish for?
2 years or so this summer
When did they first start dying?
Within last few weeks
Have you added any new fish or plants in the few weeks before this started?
No changes whatsoever
Have you tested the water for ammonia, nitrite, nitrate and pH?
No but I was about to ask if my testing kit would be of use!
Does the pond have a filter?
Not turned on, don't know why but dad turned it off.
If yes, how often and how do you clean the filter?
When was the last time the filter was cleaned?
Have you done a water change on the pond recently?
No bu t had heavy rain in last two months.
How often do you normally do water changes on the pond?
It had a good clean out two years ago.
Do you use mains water or well water on the pond?
Mains
If using mains water, do you dechlorinate the new water?
No, but this pond is outside and often over flows as result of rain.
Have you got any pictures of the fish?
What symptoms do the fish have?
Blackish in colour, I think where rotting.
Has it rained recently?
Yep.
Has anyone sprayed or fertilised near the pond?
Nope, mum and dad are mystified by it.