They collected some specimens, which they incubated in an oxygen - free environment — and the eggs hatched successfully in the complete absence of oxygen. (treehugger.com)
This is nothing like making fermented vegetables which need an anaerobic (absence of oxygen) environment and must have a good lid. (talesofakitchen.com)
Remember the wild ferment is an anaerobic process, therefore happens only in the absence of oxygen. (greenkitchenstories.com)