Working with shrimp hatchery people and they use Artemia,  also known as brine shrimp used as live feed in shrimp hatcheries . Artemia cyst were stored in refrigirator( dormant condition) were kept in water and within 24 hrs they become active. Transformation of cyst to active form under foldscope

Artemia cysts

These cysts were kept in a cavity slide with some water and observed the development stages under foldscope

developmental stages

The fully grown Artemia image and video in other post as the size is exceeding