Do brine shrimps prefer light or dark?

Brine shrimp are attracted to light. They use light as a cue to find food and navigate their environment. In the wild, brine shrimp live in shallow, hypersaline waters where they feed on algae and other microorganisms. These microorganisms are often found near the surface of the water, where there is more light. As a result, brine shrimp have evolved to be attracted to light. This adaptation helps them to find food and avoid predators.

If you are keeping brine shrimp in an aquarium, you can use light to control their movement and behavior. For example, if you want the brine shrimp to swim in a certain direction, you can shine a light in that direction. You can also use light to attract brine shrimp to the surface of the water, making it easier to feed them.