For ponds that didn't run the aerator during the winter, now is when I start them and let them run - no ramping up. That water temp is perfect for it like Bill said.

In my pond, I shut mine off because I have a project that I'm testing that needs a thermocline set up to work.

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[Linked Image from lh6.ggpht.com]
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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).