What is a water louse?

A water louse, scientifically known as Asellus aquaticus, is a freshwater crustacean belonging to the order Isopoda. These small, shrimp-like organisms can typically be found in ponds, lakes, and slow-moving streams, where they play a role in the ecosystem by feeding on decaying organic matter. Water lice are characterized by their flattened bodies and segmented exoskeletons, and they are an important food source for various aquatic animals. Despite their name, they are not true lice but are more closely related to crabs and shrimps.