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Dear “Schellfisch”, I have no experience myself with this method, but I know some German experts who work this way. And seen the good results. It does work indeed. It is quite useful if you have “bad eggs” that hatch to a low percentage only. Then you can avoid that mess with many unhatched eggs by removing the eggshells before. On the other hand avoiding the handling of any chemical solutions and the necessity of exact dosage is an advantage, too.
If anybody has used the method himself he should write on it here. If you want to get in contact with such persons I could help with addresses.I have some good experience with the decapsulation (which is a well known and described method). I hate the capsules in my tanks (at least some of them always get to the tanks and remain there forever) and it is claimed, that the nauplii hatched from the decapsulated eggs are more nutritious (no energy is spent to get out of the eggs). However I have never heard about freezing eggs during the hatching. Most sources I know recommend storage in brine or salt in a fridge (after dehydration).
A protocol from zebrafish.org: http://zebrafish.org/zirc/documents/protocols/pdf/Fish_Feeding/Live_Food/Artemia/Artemia_Decapsulation.pdf
A different method using cheaper chemicals: http://www.fao.org/docrep/field/003/AB909E/AB909E00.htm
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