Definition
Order Branchiura represents a group of parasitic crustaceans commonly known as fish lice. These creatures attach to fish, feeding on their blood and tissues. They are ectoparasites, meaning they live on the external surface of their host. Fish lice have flattened bodies adapted for clinging to their host. Infestations can lead to irritation, secondary infections, and stress for the fish. Essentially, they're like unwanted hitchhikers causing trouble for their fishy rides.