Brine Shrimp

We hatched Brine Shrimp!
Brine Shrimp have evolved a mechanism that allows them to stay in egg stage until the time is right to hatch. Their criteria involve a particular solution of salt- no more, no less.
We placed varying concentrations of salt water (% by mass) into petri dishes, then placed glass slides covered with around 20 brine shrimp into solution. We waited 24 hours, took stock of how many shrimp were swimming, then took a second set of measurements at 48 hours.
Our class data was off because we committed some human errors.
We may have miscounted the shrimp.
or
mixed up the saline solution labels.

Our class graph indicated the optimum salinity for brine shrimp to be 0.5% NaCl.