Authors monitored the sanitary and hygienic state of the river and pond basin of the Republic of Dagestan for contamination of the cestodes Triaenophorus nodulosus (Pallas, 1781) and Triaenophorus crassus (Forel, 1868) eggs. The water pollution of 25 rivers and pond water bodies of Dagestan with eggs of the cestodes Triaenophorus nodulosus (Pallas, 1781) and Triaenophorus crassus (Forel, 1868) was studied in winter, spring, summer and autumn in control sections by researching 2 500 water samples using conventional methods in the laboratory of invasive diseases of animals and birds. For the presence of eggs of the cestodes Triaenophorus nodulosus (Pallas, 1781) and Triaenophorus crassus (Forel, 1868), using conventional methods in different seasons (winter, spring, summer and autumn), 100-200 samples of water and silt of vegetation of pond reservoirs in natural zones were examined. According to the results of the sanitary and hygienic examination of water and silt of natural and pond water bodies of the Republic of Dagestan for the contamination of the cestodes Triaenophorus nodulosus (Pallas, 1781) and Triaenophorus crassus (Forel, 1868) eggs, it is possible to state moderate and high levels of water pollution with eggs of these cestodes species. According to the sanitary and hygienic state, natural and pond water bodies of the Republic of Dagestan in all natural and climatic zones are unsuccessful foci of trienophorous fish invasion by eggs of the Triaenophorus nodulosus Triaenophorus (Pallas, 1781) and Triaenophorus crassus. (Forel, 1868).
Caviosis in the waters of the south of the Russian Federation is a poorly studied problem. Indicators of the extent of invasion were in the range of slightly moderate registration with extent of invasion (9.00-15.00%) with an abundance index of cestodes Khawia sinensis (1.40-2.18 ind./piece) in fish of different species (bighead carp, grass carp, black carp (black Chinese roach), spirlin, Sabanejewia caucasica, Krinitsky char, Tersk nase, Tersk barbel, silver Prussian carp, rutilus, Tersky gudgeon) in the basin of the Terek river, and a high level of detection of cestodes in the intestine of fish of 6 species (common carp, European carp, Tersk barbel, crucian carp, rutilus, Tersky gudgeon) was registered with extent of invasion criteria (21.00-37.00%) and an epizootic degree of abundance index of the cestode species Khawia sinensis (4.16-6.13 ind./piece). As a result of biochemical studies of 20-30 fish muscle samples within the boundaries of Dagestan authors found that the intensity of infection of fish of 14 species in Terek river basin with intestinal cestodes Khawia sinensis reduces the content of iodine, cobalt and iron in the muscles, that affect the nutritional value of fish. The content of biogenic microelements in the muscles of fish infected with cestodes Khawia sinensis was 2-5.9 times less than in fish free from helminths, which confirms the fact that the biological qualities of fish decrease with intensive cestode invasion. The most intensive infection with intestinal cestodes Khawia sinensis in comparison with fish populations free from helminths caused the marked reduction in the content of biogenic micronutrients in the muscles of trout, common carp, European carp, grass carp, black Chinese roach.
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