[Cytomorphological and biochemical characteristics of the whitefish, Baikal omul Coregonus migratorius, infected by plerocercoids of Diphyllobothrium dendriticum (Cestoda: Pseudophyllidae)].

The cytomorphological and biochemical composition of the blood has been studied for the deep-dwelling (bottom) morphotype of the Baikal omul infected by plerocercoids of Diphyllobothrium dendriticum, during the fish spawning migration. A decrease in hemoglobin synthesis and an increase in the proliferative activity of erythroid cells have been registered. The changes in the leukocyte population composition, immunoglobulin, and total protein concentrations evidenced a disorder of blood cell proliferation and differentiation and suppression of the immune response in the infected fish. The changes in the humoral and cell factors of homeostasis in Coregonus migratorius infected by D. dendriticum during the spawning period remain within the limits of the adaptive possibilities of the species.