I just added my first post yesterday and it happened to discuss my experiences with hatching baby brine shrimp (BBS) so I’ll include an excerpt here.
I had come across such bad information regarding the hatching and feeding of live BBS. I read that they are devoid of nutrients unless gut loaded, I read to add spirulina as soon as they hatch, etc. From what I have researched (see scientific papers and research reports below), this information is inaccurate.
First, BBS are highly nutritious if used as food in the 1st 6 hours post hatch due to the yolks attached to their bodies. Since BBS hatch in my setup between 18-20 hours then I know exactly when to start/harvest them for highest nutritional value. I use an incredibly easy hatching system by Ziss. I run two batches at a time (I have 2 Ziss) and then I harvest and rinse them (using a 50 micron screen I bought from Reef Nutrition) in fresh seawater, place them in a wide flat Tupperware container (so there is enough water surface exposed to air to keep them alive) with about an inch of freshly made seawater and then I add them to the refrigerator for future feedings. Mine live for up to 2 weeks like this - with the yolks remaining intact for the entire time due to slowing down of their metabolic rate from refrigeration (I know this because I set up a lab with microscopes in my basement). So then I have fresh BBS on hand whenever I need as long as I open their container daily to let fresh air in. And they become very active when I add them to the little feedercup with fresh tank water to warm them up.
As far as gut-loading, freshly hatched BBS cannot be gut-loaded because they do not yet have mouths (see research below). So I add 1 drop of Selcon to those that I pull out to feed the tank. The Selcon sticks to them and adds extra nutrients.
And when I add to the tank, I turn off the pumps for a few minutes, squirt them all over the tank and everyone feasts! My mandarin is nice and plump (maybe too plump). So in my experience, this is a terrific way to keep fish healthy and offer them a varied diet.
Anyway, sorry for the long post but I wish I had read something similar when I started
Below are the resources that helped me, I hope it helps someone else
https://digitalcommons.uri.edu/cgi/viewcontent.cgi?article=1085&context=srhonorsprog
4.3. Use of nauplii and meta-nauplii
https://www.tfhmagazine.com/article...commonsense-approach-to-brine-shrimp-hatching