Pond Boss Forums AERATION Should I aerate? When stop or reduce Aerating / When are cold mos?

I have read that is not as necessary to aerate during the cold mos. I am a new pond owner. We have BG and LMB and started fertilization and aeration about 8/1/09 of this year. we are also feeding the BG. We put 600 PK shrimp in about 3 weeks ago. We want spawns again of possible, but know that with the cool nights the aeration will bring the temp down sooner. Last nite it was 45 at our pond and we are still aerating 24/7. When should we go to partial and / or turn aeration off? The pond is a bout an acre and avg of 4 feet deep right now.