Abstract
In our study, we obtained new data on the leukocyte composition of the spleen of Siberian roach and goldfish infected with Ligula interrupta and Ligula intestinalis, respectively, in a comparative aspect. The sample of fish consisted of non-aquatic catches, the same size-age composition (age + 3 ... + 5, body length 145–237 and 150–180 mm, respectively, weight – 100–184 and 120–174 g) from water bodies of the Baikal lake basin (Dolgoye lake, Cheremukhovoye, Gusinoye). It is noted that in the spleen of goldfish the number of lymphocytes did not change in general, but there was a significant change in the ratio of mature and immature forms: the number of prolymphocytes decreased by 1.5 times, and the content of mature lymphocytes increased by 3.8 times. Unlike goldfish, the infected roach showed the formation of vacuolated cells up to 5.3%, and intense leukopoiesis processes are observed, which is confirmed by a higher content of blasts (by 3 times). Among the granulocytic reactions in fish, similar reactions were observed along the line of neutrophils: a significant increase in poorly differentiated forms in goldfish, as well as mature microphages in roach. It has been shown that, in these parasitic systems, ligulid larvae can be modulators of the adaptive immune response.
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