Publication Abstract

Argulus: the facts about the freshwater louse

S. Bark

Long recognised as pests in the freshwater cultivation of trout in Europe, the earliest records of Argulids date back to the seven-teenth century. However, salmonids are not the only species at risk; all fresh water fish, of all age groups are susceptible.

Of the 100 or so species of Argulids (not to be confused with sea lice), the best known are Argulus foliaceus, A. japonicus and A. coregoni. All three are prevalent in the UK.

Argulus foliaceus' preferred hosts include Salmonidae, Cyprinidae and Acipenseridae (sturgeon). The species is a frequent parasite of common carp in Europe and Asia. Argulus japonicus now has a worldwide distribution primarily owing to the ornamental trade, being introduced with goldfish from Southeast Asia. Its distribution overlaps with A. foliaceus but this species is normally associated with warmer waters. Argulus coregoni, like Argulus foliaceus, has a particular association with salmonids and cyprinids. It is also found throughout Europe, in the cooler waters of rivers and lakes.

Reference:

S Bark, 2000. Argulus: the facts about the freshwater louse. Fish Farmer, 23(3): 40