Brine shrimps are tiny little crustaceans that usually live in lakes with really high salt concentration.
For some reason they are also called Sea Monkeys — probably a clever marketing ploy.
They are aquacultured and sold as fish food either alive, frozen or dried.
Adult brine shrimps sort of look like creatures from a horror movie:
The brine shrimp eggs are also sold dried and they can survive out of the water for years and can be hatched in relatively simple home set ups.
Newly hatched brine shrimp nauplii (larvae) are called baby brine shrimp and they are an important food for feeding fish fry.
They can be reared to adulthood and used as adult brine shrimp which is not considered as good a fish food source as the baby brine shrimp but it is easier to produce a larger bulk or grown brine shrimp than babies.
To learn more about brine shrimps click on the links below:
Brine Shrimp and Ecology of Great Salt Lake