THE CONDITIONS OF TWO HEMATOLOGICAL PARAMETERS IN MASS SPECIES OF FISH OF SARATOV RESERVOIR

Abstract

The results of long-term (1998-2013) hematological studies of ten mass fish species of the Saratov Reservoir and three of its tributaries are presented. The species are: roach (Rutilus rutilus Linnaeus, 1758), bream (Abramis brama Linnaeus, 1758), white bream (Blicca bjoerkna Linnaeus, 1758), bleak (Alburnus alburnus Linnaeus, 1758), perch (Perca fluviatilis Linnaeus, 1758), pike (Esox lucius Linnaeus, 1758), round goby (Neogobius melanostomus Pallas, 1814), round-headed goby (Neogobius iljini Vasiljeva et Vasiljev, 1966), candied goby (Proterorhinus marmoratus Pallas, 1814), Amur sleeper (Perccottus glenii Dybowski, 1877). Over the past decades, the proportion of individuals with various disorders of hematological parameters among fish of different species was high. We attribute this primarily to water pollution. The ratio of erythroid and lymphoid blood cells and the proportion of the main forms of leukocytes among white blood cells were studied. Regression analysis confirmed the statistical significance of the association of the prevalence of hematological disorders with water levels of copper and phenols The dependencies of the prevalence of the hematological disorders on the levels of manganese and organic pollutants (zooplankton saprobity index) were not statistically significant. Because of the nonspecific nature of the detected hematological disorders, the prevalence levels of specific types of hematological disorders do not depend on species. The possibility of using the studied hematological parameters to assess the effect of certain toxicants (Cu, phenol) on fish is shown.