[The parasite-host relations in the system of Ligula intestinalis (L.) (Cestoda, Pseudophyllidae)--the bream].

Proteins and reducing sugars were assayed. The total proteolytic and amylolytic activities were determined in flushes of body cavity of the breams infected and noninfected by plerocercoids Ligula intestinalis. Infection with L. intestinalis markedly affected the composition of the medium and the activity of enzymes functioning in the body cavity of the bream: protein content increased, total proteolytic activity remained practically unchanged, while the content of reducing sugars and total amylolytic activity decreased. The strength of fixation of amylolytic enzymes on the surface of L. intestinalis tegument was tested. The dynamics of desorption of these enzymes from the tegument of plerocercoids and adult cestodes parasitizing in the fish intestine. The contents of protein and glycogen do not depend on the cestode length and strobile region.