Occurrence of Atractolytocestus huronensis Anthony, 1958 (Cestoda: Caryophyllaeidae), in Hungarian pond-farmed common carp

In 2001, a caryophyllidean tapeworm, Atractolytocestus huronensis was detected in the intestine of pond-farmed common carp in Hungary. Within two years the cestode spread throughout Hungary and its presence has been demonstrated in several pond farms. The parasite commonly occurred in the gut of market sized common carp imported from the Czech Republic. The cestode can infect some weeks old common carp fry and older age groups alike. A. huronensis specimens measuring 0.7–1.5 cm occurred in the most proximal segment of the common carp foregut, where they were firmly attached to the gut wall by their scolex. By its characteristically low number of testes A. huronensis is well distinguishable from the species A. sagittatus known from East Asia and from the Astrakhan territory of Russia.