Histopathology of organs of grass carp (Ctenopharyngodon idella) from the Ile river and the Kapshagay reservoir

The ecosystems of the Ile-Balkhash region have been subjected to anthropogenic pressure in recent years, which leads a decrease biodiversity, including commercial fish. In present study, using method atomic absorption spectroscopy, content heavy metals surface waters and bottom sediments Ile River (upper reach, Panfilovsky district, Almaty region) southeastern part Kapshagay reservoir was determined. An excess MPC among 9 determined HMs, found for Fe > Zn Pb Cd. accumulation these HMs also organs (gills, liver, large intestine, kidneys) grass carp caught different parts studied water bodies. With help histological morphometric methods, morpho-functional state assessed destructive changes same were revealed. At time, it that nature quantitative indicators histopathological depend on level HM place capture. greatest structural from reach) compared with fishes reservoir. gills, hyperplasia, fusion plates, necrosis edema gill epithelium were revealed. Expansion spaces Disse, sinusoids, dystrophy hepatocytes, numerous melanomacrophage accumulations liver. intestine – stratification wall tissues: muscular, serous, submucosal mucous bases, enterocytes. kidneys, wrinkling divergence capillaries vascular glomeruli, an increase Bowman space, dystrophic necrobiotic epitheliocytes proximal distal renal tubules observed. It concluded bioaccumulated tissues subsequently worsen their and, thus, affect health revealed effects can be biomarkers aquatic environment. Key words: river, reservoir, metals, carp, histopathology.