I found this on the website that the IBC gets their bbs eggs from
Cold storage of live BBS saves time and eliminates the need to maintain daily hatches of brine shrimp cysts. When newly hatched brine shrimp are stored at 4°C, their metabolism is slowed down considerably, conserving essential nutrients, lipids, and fatty acids that many fish and invertebrate larvae require. A lower metabolism will also slow down growth and maintain a smaller feed particle size for smaller larvae and fry.
Later feedings of stored BBS is easy. Simply pour the BBS into a fine mesh net, rinse with fresh water, and feed.
I am going to try this!