Copepods develop from eggs, through six naupliar stages and five copepodite stages to adults. Not easy to find them all. Here are at least 2 stages of naupliar.
The first 15 seconds or so, there are at least 10 nauplii in their very early stage. They don't move much and can only eat phytoplanktons. After 16s or so, you can see 2 nauplii in their later stages. Very active and hunt for micro algae to eat.
* Special thanks to a couple of adult Copepods to do a walk by and give you perceptive on the nauplii sizes.
Again, don't forget to watch it in HD, and maybe full screen.