what killed my fish?
I've had a koi pond for several years, (about 2000gl with 10 to 15 fish) I'm no expert but I've managed to keep my fish alive through the years, with minimum loss over the winter (lost only 1 last year, none the 5year before last)
This year as the snow started melting I started losing fish ...one by one the largest (over 1') ones all died
I think I lost 7 or 8 , only 3 babies survived and I have no idea why
...is it because we had a super cold winter and at times it was impossible to keep the ice open for aeration?
Is it because there was substances in the snow that got plowed onto the pond?
Do you guys have any idea why I lost all the larger fish and not the babies?
I would like to understand what went wrong so that it never happen again