It wasn't stated, but I felt it was implied that the poster was looking for adult, or at least juvenile live brine which are definitely more work than just hatching out and feeding within a short period of time.
As far as nutrition of brine shrimp goes, their lack of nutrient has been falsely perpetuated over time so that most people believe it. In fact, the dry weight percentage of brine shrimp protein is higher than most other foods we feed our fish, rated at 50 to 60%.
Naysayers point to the very low protein content listed on frozen brine packages, but in fact, those percentages include the brine moisture, AND, all the packaging fluids added to be able to efficiently package this product.
If you take freeze dried or flake foods or pellets, and soak them, then the approximate 45% protein content shown on their packaging, now becomes very minute, like the frozen brine.
However, the nutrient profile of brine shrimp just changes, from the high fatty acid profile and lower protein content, to the higher protein content and much lower fatty acid levels.
The strength of live brine as a food comes from the fact you can gut load them with a variety of products, like the selco emulsions, (I prefer powdered AlgaMac 3050 which stores a long time), vitamines, more protein, or even medications if they are first emulsified. Thus you can create your own nutrient levels in your food with this methodology.
Newborn cannot gut load as they have no mouth or anus but after about a day, the second instar stage can be. It takes two gut loaded stages, each of 12 hours, with new water and food after the first 12 hours is completed.
Gut loading becomes faster to the point that as late term juveniles and adults, they can be gut loaded in just an hour to an hour and a half.
For
TRUE information on brine before gut loading see here:
Nutritional Properties of Ongrown Artemia
which comes from the United Nations site:
Manual on the Production and Use of Live Food for Aquaculture
Much of the information in this Manual comes from the Artemia Reference Centre at the University of Ghent.