I'd like to enter the conversation. I have a 1/3 acre pond 60 x 225 with depths averaging 6 ft. and deepest corridor at 12-14 ft. Stocked with Rainbows and there are challenges.
My pond is struggling on the edge with the 200 10-12" rainbows put in around March now at a healthy 14-15", but the temps up to 68-70 degrees (ouch!) I installed a pump to give me up to 30 gpm of 50 degree water, but that is not much in reality. It ends up being over 40,000 gallons / day, but only a 5% exchange of the 800,000 overall capacity.
The big deal with rainbows is temp and dissolved oxygen. The top temp for trout is 70 and at 72 / 73 they die off within a matter of hours. A regular cold flow of water into the pond is almost essential. What is your bottom temp and surface temp? And,what size were the rainbows when you stocked them?
