Wood,

I have only brook trout this year (about 140 in the 1/10th acre pond) and only run the diffuser primarily in the evening when air temps cool down and shut off in the morning as air temps rise. I think there is enough aerated flow coming in along with phytoplankton and macrophytes during the day to make enough oxygen.

Not sure what what the temps are in the deep water but about 4 feet down temps peak at about 64 on really hot days.

So far no mortalities and I hope to put in a floating dock to measure temps in the deep water. Of course I have about 38 gpm flowing in 24/7 at about 10.8 C (51.6 F.)

Unfortunately this strain of brook brout (Lake Nipigon) is a dissappointment. Growth rates are not a fast as the last more domestic strain I had, and growth is variable among individuals. I am fuming at my state DNR for not allowing me to get my brook trout from the last source.

If pigs could fly bacon would be harder to come by and there would be a lot of damaged trees.