This is my 30th or so batch and I've never seen this before.
The best way I can describe it is that it looks like summer in the Arctic and pieces of ice are breaking off the ice caps.
Any idea as to what this is?
The beer is the Extra Special Bitter from Northern Brewer (extract). I used the Wyeast 1968 strain and made a yeast starter. I aerated with an aeration stone. I think I had a temperature problem with this one but can't remember. I either let the temperature spike on the 7th day of fermentation or I let the temperature fall too low on the 3rd day of fermentation (I had a Bitter and an ESB going nearly simultaneously and mixed them up...)