We lost over fifty rainbow trout during the recent heat dome, and since then I’ve only been running the bubbler aerator at night. I’ve been thinking about running cold tap water into the pond during the next heat wave or burying pipe at least four feet deep and making a reverse geothermal loop to pump warm pond water out, circulate it and then send the cooler water back into the pond. Has anyone tried either of these, or anyone have any other ideas?

1/3 acre pond, 12 feet deep at center, about 2 hours west of Seattle, rainbow trout