Hi I am is desperate need of advice, I live in sunny South Africa have 10 trout dams on an estate for catch and keep purposes. Each dam is approximately 2,5 Acres and 3 metres +/- 10FT deep in certain areas. The main issue is in summer the water temperature is sitting at 28deg celsius 82 fahrenheit, This makes the fish lazy and they don't eat, therefore making the experience terrible, not only for the fish but the fisherman. The question is how could i drop this by 5deg celsius without having to use chemicals etc. I have put in aerators to keep the oxygen levels high but this doesn't help to cool the water at all. I have looked into building fountains but i am not sure that this will have any real impact on the cooling. If anyone could assist it would be greatly appreciated.