Aeration and delayed fermentation ramp up.

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culaslucas

culaslucas

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I recently started using an aquarium pump with one of those sanitary filters & a diffuser stone to aerate my wort for approx 30 minutes. However, I have noticed that the ones I have aerated take quite a while to get ramped up and don't seem to ferment as wildly as some in the past.

Shouldn't the opposite of this happen?? Shouldn't I get a faster ramp up and more vigorous fermentation by aerating?
 
No, more oxygen means more growth, so the fermentation is delayed. The shift from growth to fermentation will tend to be more gradual.

I recently fermented a high-gravity (1.078) wort that had been processed with O2. Even though I used 11 gm of dry yeast, the fermentation was delayed almost 24 hours and was never explosive. Still, it hit 1.011 at six days.
 

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