All-Russian research Institute of integrated fish farming-branch Of the Federal Science Center for Animal Husbandry named after Academy Member L.K. Ernst, Russia

Abstract

The composition of leukocytes reflects the species features of fish. The ratio of individual cell types reflects the functional state of the organism and the nature of the influence of biotic and abiotic stress factors. Kronotskoye Lake is located in the Far East on the territory of the Kronotsky State Natural Biosphere Reserve (Kamchatka). Due to the peculiarities of the hydrological regime and the relief of the Kronotskaya River basin, anadromous migration along it is limited. Therefore, anadromous fish do not return to the lake after the marine period of their life cycle. The lake basin is inhabited by at least six reproductively isolated forms (species) of chars. White char, Salvelinus albus Glubokovsky, 1977, at the early stages of ontogenesis feeds on invertebrates, and as it grows up, it goes on to a predatory lifestyle. White char migrates around the lake: spawning occurs in the tributaries, and feeding takes place in the lake itself. This work is devoted to the study of the intensity of leukopoiesis and leukocyte composition of the blood, head kidney and spleen of the white char of Lake Kronotskoye. Seven individuals caught using gill nets from July 8 to August 14, 2011 were studied. Peripheral blood was sampled from the tail vein. Sampling also included spleen and head kidney tissues, blood smears and organ-imprinted smears of kidney and spleen. The leukocyte formula and the frequency of occurrence of leukocytes in a peripheral blood smears were calculated using light microscope. The composition of white blood cells in the white char is similar to that of other fish species (lymphocytes, monocytes, neutrophils, and blast cell forms). No basophils or eosinophils were found. In organ-imprinted smears of immunocompetent organs (kidney, spleen), the percentage of lymphocytes is lower and the percentage of blast forms is higher than in the blood leukogram. The abundance index differed from the data obtained in the study of other fish species. English version of the article is available at URL:https://panor.ru/articles/composition-of-peripheral-blood-leukocytes-and-immunocompetent-organs-of-the-white-char-of-lake-kronotskoye-kamchatka/72718.html