"Sea monkeys" - 'Artemia nyos' - are not your run-of-the-mill feeder brine shrimp; rather, they are an artificial "hybrid" (read "rigorously cross-bred") strain developed by the New York Ocean Science Laboratory, Inc. (the species designation is an acronym). See this link for a comparative chart [not exactly what one might call scientifically accurate, I must note] detailing the respective development times and lifespans of Artemia salina and "A. NYOS".
I dont think that I would feed them too my fish, Who knows what they have done to them?!? I would get some eggs, and hatch some your self. Its really easy. BTW, you have a bad link.