Effect of Trypanosome Infection on Hematological Parameters of the Black Sea Sprat (Clupeonella cultriventris) from the Ivankovo Reservoir

For the first time, light microscopy has been used to study the parameters of blood cells for the Black Sea sprat (Clupeonella cultriventris Nordmann, 1840) from the Ivankovo Reservoir with trypanosomes in the peripheral blood. A shift in the composition of erythrocytes towards immature cells, lymphopenia, an increase in the proportion of immature granulocytes, and a decrease in the proportion of platelets have been detected. It is noted that fish of this species had not previously been infected with trypanosomes in the Ivankovo Reservoir.