First of all you really have to want to grow them if you want adults in any meaningful numbers. It can be labour intensive.
It is not worth it if you can buy them locally or online.
You might have many failed attempts until you get it right.
I began about 15 yrs ago when we could no longer get the live brine at our stores. Now, while some stores get them in, it's not too many that carry the artemia on a regular basis. (In Canada I'm speaking of)
In the US, one can get them easily from livebrineshrimp.com.
Second, ignore most postings about nutrition of brine shrimp as there is just too much misinformation out there.
From the Artemia Reference Centre at the University of Ghant, published in many articles, but the main source currently quoted is the
MANUAL ON THE PRODUCTION AND USE OF LIVE FOODS FOR AQUACULTURE
where in section 4.0 artemia, you can find out almost any information FACTUALLY accurate on brine shrimp.
In truth, immediately upon hatchout, the nauplii have good levels of fatty acids (huffa) and decent levels of protein. As the egg sack is consumed, the fatty acid profile rapidly drops so that the protein content is the main nutrient in the artemia, to the point that the protein level of juveniles and adults for aretemia raised from GSL cysts will run 49.7 to 62.5% but the fatty acid levels are only 2.4 to 9.5%. ( Table 4.4.1 of section 4.4.1)
Now the great thing is that artemia nutrition can be readily changed relatively simple by enriching them with products before they get fed to the tank.
You can get medicines or specific nutrient profiles to your fish just by proper selection of the enrichment material.
As long as the particles can be micronized, or the liquids emulsified, all to appropriately sized particles, you can make the artemia higher in protein, or higher in fatty acids, or both, or you can target feed specific medicines to fish that don't eat medicated flake foods.
One of the biggest problems with reported nutrition is that some foods report in dry weight and others report in wet weight so it's hard to compare.
In the case of frozen brine shrimp, for instance, the nutrients are almost always reported in wet weight. To properly compare to other foods, you need to know just how they are reporting and then compare the same specifics.
Adult brine shrimp have more protein than most flake/pelleted foods in use for aquariums, but to compare, one would have to dry out the frozen brine, or to wet the dry foods, reweigh and recalculate the information.
For me specifically at this time, my major use of artemia is for seahorses, including fry.
Newly hatched brine are not as nutritious, even with the egg sack intact, as growing them out for a day until they develop the digestive tract and then enriching them for two twelve hour stages with new water and enrichment for each of the two stages, using appropriate enrichment material.
For me, the best is Dan's Food with/without Beta Glucan, from seahorsesource.com, (good for all marine fry) or I can tailor what I want the seahorse fry or adults to have by mixing various amounts of Algamac products like Protein Plus and 3050 (fatty acids).
I supply the same products to a lot of clownfish breeders around me so we benefit with larger orders to reduce cost.
If you are still really interested, you can view my page on artemia growing and tailor the method to your own scale of need.
RAISING BRINE SHRIMP TO ADULT