Brine shrimp dead on 2nd day

[Darkkon]

Hi recently i have decided to hatch brine shrimp for my fry. The eggs i have had a high yield rate, but by the 2nd day after hatching i noticed almost all died, sinking right to the bottom without any movement. This was in spite me putting airpump after they hatched and the egg shells were filtered. I also put in a wee bit of yeast for them to eat. What could be the cause of the massive premature death?

[CoryDorus]

temperature ? salinity ?