A mix of at least three paramecium and infusoria cultures that I've bought. Under a microscope I see almost all paramecium. This strain of paramecium is a small sized strain compared to others I've seen. There is just a shimmer to the water, you can't pick out any single individuals. The green in the photo is from the live Chlorella vulgaris I've been feeding the culture lately. In the past I've successfully fed it with boiled wheat berries and dried banana leaves. The Chlorella vulgaris has the best production and least amount of smell. I'll package it in a 12 oz bottle.