The red blood cells cytometric characteristics of young fresh-water fish of various families

The morphometric indices of red blood cells young fish various species inhabiting coastal zones the water bodies were studied. subjects research four families: Carp (Alburnus alburnus, Carassius gibelio, Rhodeus amarus, Abramis brama, Rutilus rutilus), Needles (Syngnathus abaster nigro lineatus), Centrarchidae (Lepomis gibbosus), Loaches (Cobitis taenia taenia), Gobies (Neogobius fluviatilis). hydroecological conditions characterized by an intense oxygen regime, high content phosphates, and heavy metals (zinc). peripheral was taken from tail vein; smears made according to classical Romanowsky-Giemsa method. Our showed that belonging ecological group inactive unpretentious fluviatilis, gibelio) had largest cross-sectional area a index nuclear-cytoplasmic ratio. indicators erythrocyte eccentricity highest in active with energy costs Lepomis gibbosus). number erythrocytes pathological events (cytolysis, karyolysis, pyknosis, poikilocytosis) observed Alburnus alburnus (14%), smallest one amarus gibbosus (2–4%). In individuals Syngnathus lineatus affected parasitic nematodes genus Ascaris, pathologies increased 81%. Under toxic load, destabilization circulatory system begins appearance forms as compensation for depleted mature ends mass destruction erythrocytes. Given these patterns, well relatively low ballast features, we can assume state studied fishes meets conditional norm, exception infected parasites. our opinion, main characteristics reflect fishes’ adaptive capacities are follows: ratio erythrocytes, ratio, relative pathology.