My 2 cents are IT ALL DEPENDS, in a shallow pond like mine (8 ft. deep) you need cold springs, or supplemental water from a well, or cold water from a stream. I have almost 100 gpm piped in from a stream which mixes the pond pretty good and I've never had a problem with trout surviving the summer. As of yesterday the pond was 58.2 @ 5ft., 59.8 @ 2ft. and the water from the inlet pipes was 54.7.
For aeration the bubble tubing is set at 4 to 5 ft. deep and in the summer the aerator is connected to a thermostat which only runs when the temp. is below 66. In the winter the bubble tubing is kept at the same depth and it runs 24-7. I don't use the aerator in the spring or fall.
timberframe you mentioned from another post that your trout did ok last summer and the depth was 10ft., is your pond spring fed, or do you add water from another source?
