Frozen Copepods (Apocyclops royi) from Brine Shrimp Direct is available in convenient 100-gram (3.5 oz.) blister packs for the hobbyist as well as 1-kg. frozen flat packs for public aquariums and fish hatcheries. Sustainably-sourced and commerically grown in euryhaline ponds in China, A. royi is a natural source of omega-3 fatty acids and a good source of amino acids for early stage marine life and is used extensively in commercial fish-farming in Asia.