Once its in the fermenter, you want to give it a shake with the lid on to dissolve oxygen into the wort. Note, this is the only time you want oxygen introduced, as its necessary for yeast growth - later during bottling, splashing is bad as it will cause the beer to become oxidized over time leading to "cardboard" type off flavors. This isn't such a big deal in dark roasty beers where the roastiness hides the flaws easier, but in light beers its not a good thing.
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