also called Carp Louse, plural Fish Lice, or Carp Lice, any member of the crustacean subclass Branchiura, a.... lice, carp

also called Carp Louse, plural Fish Lice, or Carp Lice, any member of the crustacean subclass Branchiura, a group of parasites of migratory marine and freshwater fishes. Most fish lice are effective swimmers, but many species tend to move through the water by a somersaulting action. lice, carp