Shawnee&Trevor":3ph6pkhl said:
I have the same questions, say someone wants to buy the worms from you. How do you separate them out so you can get a proper weight? Or vice versa. How do you separate the compost from the worms if someone is buying that part from you?
Worms like dark and damp, and they will retreat from light and dryness. The details and logistics will differ depending on your setup, but for a home sized bin, my teacher uses her kitchen floor, which is linoleum, and just mops up afterwards. You could also use a baby pool, a tarp or similar.
Shovel your finished worm castings into your baby pool or tarp. The baby pool or tarp should be out in the sunlight. Pick a nice, sunny day to do this. The worms will crawl into the center of the pile of castings as they try to avoid the light. Scrape off the surface of the pile as it dries and the worms have retreated. Keep scraping off the surface, putting the worm-free vermicompost on a separate tarp, in a bin or what-have-you. Eventually you will have removed all of your castings, and will have a wriggly ball of worms left behind. You are now free to use or sell your freshly separated worms and/or castings as you see fit. Be careful not to cook your pile of worms. If you're doing this indoors, a bright desk lamp works, too.
It helps if you've been feeding on the other side of the bin from where you're harvesting castings, so that most of the worms will have already migrated.
Your castings will be full of cocoons. Need a Zen moment? Have small children you can take advantage of? The cocoons can be picked out, but it is tedious. The cocoons look like little brown bubbles. You don't have to pick them out, but if you're trying to increase your worm population, and you have child labor at your disposal, it may be worth it to you. Composting worms need a lot of organic material to survive, so they may or may not thrive in your garden when you amend with castings. It all depends on the garden.
There are youtube videos out there on separating worms and compost. Some people sell worms by the count, others sell them by bedrun weight. Bedrun would be worms with bedding, like a mini starter bin.