[Distribution of the thorny-headed worm Acanthocephalus lucii (Palaeacanthocephala, Echinorhynchidae) in the digestive tract of the perch].

The distribution of Acanthocephalus lucii in the intestinal tract of perch was investigated. It has been established that host's sex and age do not affect the parasite's localisation. At the same time different age groups of A. lucii migrate to different parts of the host's intestine. With age females of A. lucii migrate in the direction of the hind department of the Gut while males remain in its anterior part.