What are brain shrimp?

"Brain shrimp" is a colloquial term sometimes used to refer to certain species of small crustaceans, particularly those in the order Amphipoda. These tiny creatures are often found in marine environments and are known for their unique body structures and behaviors. While the term isn't scientifically recognized, it may also refer to the popular aquarium species like the brine shrimp (Artemia), which are often used as live feed for fish and other aquatic animals. Their name highlights their small size and sometimes peculiar appearance, reminiscent of tiny shrimp.