Our fish during a better time.
High heat makes it harder to keep oxygen in your water so it always needs to be running either with an aerator, fountain or running stream. We have used a natural bio-filter that recycled the water through man-made (by Steve) stream of several waterfalls to aerate.
Fine until it isn't working and the temps are running high. We have had the intake pre-filter get clogged and slowed the flow and even occasionally had the pump die, but not in the middle of a heat wave.
It was trickling yesterday, so I went to clean the filter, but this time the pump impeller stopped. DONE! I get up this morning to find 12 goldfish dead or nearly dead. The oxygen was depleted that fast!
So far 8 are gone with one fighting. The other two seem to have recovered when I did triage with a water hose suspended about two feet in the air to splash water. That leaves us with 20+.
After running the water for three hours we were able to get a fountain pump from a local store and that should hold us over until I get parts for the bigger pump. I lost a little water over the top of the pond, but .....
I already have two pumps but the impellers are the weak link and I only had one. I am buying two (one back-up) and will probably keep using the fountain pump until the weather cools off later this summer.
I hate that we lost ANY. Over 20+- years we have only lost a few to old age but I have not been able to give as many away as I would have liked recently, so the population is out of balance. This isn't the way I wanted to balance it.
I found out last week that the ones we gave to a neighbor for his natural springs last Fall seem to have acclimated just fine. He wanted them to keep the algae at bay and that too seems to have been successful.