[The biology of the thorny-headed worms, parasites of trout acclimatized in the bodies of water of the Tien Shan].

A new species of Acanthocephala, a parasite of local Naemacheilus stoliczkai, was recorded from Salmo gairdneri after 9 years of its introduction into mountain water bodies of Tien Shan. Gammarus lacustris serves as an intermediate host. Dynamics of infection of trout for 9 years is shown.