Yeast Culturing from Kraeusen ?

Hey, it's as easy as bottling the trub. I didn't know there was a science or tradition to it or anything. Just be careful and start with clean bottles. It's just the sediment that collects after your primary fermentation, and after you bottle it, keep it refrigerated. That way it won't spoil. You should get two or three bottles out of five gallons. Good luck, -gc

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This is not kraeusen harvesting but harvesting yeast from the trub after a batch is finished

I do this all the time. I ferment in wide-mouthed vessels, so I just sanitize a spoon, dip in there and scoop some out. I don't take a lot -- usually just about enough to 2/3 fill an old White Labs vial. I store these in the fridge and use them as the basis for starters.

Some yeasts are better for this than others. WLP001, for instance, is a very good top-cropper. It all floats to the top after fermentation and is easily harvested. Safale S-04, on the other hand, sinks like a stone and sets like concrete in the bottom, so if you want to harvest it you have to get in half way through the fermentation. Of course, there's not much point harvesting a dried yeast strain because it's so cheap to buy more.

Rodd