Nope, it's a thing you buy or make to hatch your own brine shrimp. Idk if you can buy live brine shrimp, but I know you can hatch the eggs yourself. The shrimp would be too small so idk how to grow them out for feeding. I just always feed freshly hatched to fry.
That 6gram jar will last maybe 3 months making a batch every 2-3 days. It's very easy to hatch your own and there are many videos of how to do it on youtube. You should be able to find this stuff at your lfs, but strangely, I've never seen it at petsmart/petco.
all I use is a 24oz mason jar with 2 holes drilled in the top. I got the cheapest smallest air pump walmart sells and a few feet of air line tubing. Fill the jar 3/4 full of water, 3 tablespoons of aquarium salt, and a little less than 1/4 teaspoon of brine shrimp eggs. Run the airline tubing through the holes you drilled in the lid till the tubing touches the bottom of the jar. Turn on the pump and wait. After at least 18 hours and for about a day after that, whenever you want to feed your fry, I just pull the air line out and put a light to a bottom corner of the mason jar (the shrimp will mass towards the light, so you want it localized) and walk away for 5 minutes. Then use something like a turkey baster to suck the pink mass of baby brine shrimp up (trying not to get many eggs off the bottom) and pour it into your fry/growout tanks. After 5 or 6 feedings like this, I usually run out of enough water to catch shrimp in and so I rinse it out and start over.
I only run one hatchery, and alternate live shrimp when they're ready, and frozen when they're not. I know some other people run 2 or 3 hatcheries at once to ensure an unbroken supply of live babies, but what I do works for me.
