FEATURES OF CARP FISH GILLS HISTOLOGICAL STRUCTURE FROM ZAPORIZHIAN RESERVOIR
Journal Title: Naukovyi visnyk Chernivetskoho universytetu. Biolohiia (Biolohichni systemy) - Year 2017, Vol 9, Issue 1
Abstract
The research was held on two sections from Zaporizhian Reservoir, which differ in ecological and hydrological conditions, and are the main spawning and industrial areas. The water quality of the reservoir lower part basically corresponded to the fishery regulations, with the exception of the copper content, which exceeded the MPC by 7 times. In the Samara Bay waters the copper content was exceeded by 8 times, manganese – 1.7 times, lead – 1.5 and cadmium – 2 times compared with the MPC. The objects of research were four-year-old specimens of common carp and freshwater bream. Fish gills for research were obtained from freshly-fished fish by anatomical section, which were fixed and painted according to generally accepted techniques. Histologic studies of fish gills revealed that in the gill lobes there is cartilage of hyaline origin, which is surrounded by a loose connective tissue layer with blood vessels. The cover gill lobes cover was made up of a multi-layered epithelium. The bulk of it consisted of respiratory cells characterized by a basophilic cytoplasm, located in the center of the nucleus, in the outer layer of the epithelium – a slightly flattened form. Mucous cells are large and oval. From the gill lobes on both sides there are a lot of lamellas. The basis of the lamella is the vascular layer, formed by columnar cells placed in one row. The latter have a cylindrical shape. Two layers of relatively flattened respiratory cells formed the secondary gill epithelium covering the lamellae. Detected changes in the destructive nature of common carp and freshwater bream gills were observed in the composition of lamellas. Morphometric analysis revealed differences in their width and length. Respiratory lamellas in a bream isolated from the lower part of the reservoir were shorter and wider than in Samara Bay by 25 and 16%, respectively (p≤0.05). In the common carp from different parts of the reservoir the length of the lamellae was almost the same, but the probable differences in their width were revealed. The gills of investigated fishes from Zaporizhian Reservoir indicated the presence of histopathological changes: thickening of the respiratory lamellas terminals, fusion of respiratory and lamellas curvature. Necrosis, desquamation of respiratory lamellas and hyperplasia of the respiratory epithelium, observed by us in the fishes of the Samara Bay, indicate a toxic impact from the aquatic environment.
Authors and Affiliations
В. О. КУРЧЕНКО, Т. С. ШАРАМОК
Keywords
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