Do NOT worry about warming the water temps by installing an aeration system. If your pond will be 15ft deep, the temps below the 6ft depth will still be in the sub 60 degree F which will sustain your trout population.
If the pond is not aerated properly, bottom up, your oxygenated water will be on the top layer causing the trout to stay in the shallower water where temps will be higher and can cause a kill off.
If you're shopping for a quality system, contact Sue at Vertex. They are the best on the market and actually have factual numbers when it comes to water turnover and what their systems can and will do.
