Question: fish dying

Posted by: Michelle Brown

We put in a pond about 6 years ago. We have never had a problem with the fish dying. We have goldfish and koi. This year however, when we pulled off the leaf net in the spring, all our big koi had died. Now, we are having dead fish everyday, about 5 a day. Someone told us about pond water "turning" and when that happens your water clears up but all your fish die. Could this be what is happening? What can we do to prevent all the fish from dying? It has been really hot here this summer, could the heat have an affect on the fish? Thank you for your help!