Species Composition Of Helminths Research Articles

Helminth Fauna of Bats of the Rostov Region: Review. 2. Cestoda

Introduction. The class Cestoda is divided into two subclasses: the Cestodaria — unsegmented tapeworms, and the Eucestoda — true cestodes. The representatives of the orders Pseudophyllidea and Cyclophyllidae, which are part of the subclass of true cestodes parasitize in carnivorous mammals. At the same time, only representatives of the latter order parasitize in chiropterans. Data on the species composition and distribution of cestodes in the Rostov region have not been published yet. The list of bat species living in the Rostov region have been compiled previously. In this article, the authors study the cestode fauna parasitizing in chiropterans in the region under study. This review aims to analyse the current state of knowledge about the species composition of helminths parasitizing in bats in the Rostov region.Materials and Methods. The research materials have been obtained from the libraries and open access resources: PubMed (pubmed.ncbi.nlm.nih.gov), CyberLeninka (cyberleninka.ru), Google Scholar (scholar.google.com), BHL (www.biodiversitylibrary.org ), JSTOR (www.jstor.org), etc. Some data has been provided by the colleagues. Results. 17 species of cestodes of 4 genera, 1 family and 1 order can be found in 15 species of bats living in the Rostov region. Among them dominate the species of the genus Vampirolepis (11 species).Discussion and Conclusion. The results of the review carried out showed that maximum diversity of cestodes was found in one species of bats — the serotine bat (10 species). The smallest number of cestode species (1 per each) was found in the giant and lesser noctules. None of the cestode species found in bats in the Rostov region were recorded in companion animals or humans. However, some cestode species of the Hymenolepididae family, common in rodents, can infect the humans.

INTESTINAL PARASITES OF THE BROWN BEAR (URSUS ARCTOS LINNAEUS, 1758) IN THE EAST KAZAKHSTAN REGION

The article analyzes the literature data and own research on the distribution and species composition of helminths and eimeria in brown bears in the East Kazakhstan region. The aim of the study was to identify a type of helminth in American black bears (Ursus americanus). The relatively low level of parasite detection in this study is in line with expectations for populations of brown bears (Ursus arctos) living in large areas. Tasks: to identify and study the type of helminths in the brown bear. On the territory of the Russian Federation, the brown bear has 17 species of helminths (including 3 species of trematodes and 14 species of nematodes) and 2 species of protozoa. Most of the discovered species of helminths, eimeria, cryptosporidia both in zoos, circuses, and in the natural habitat of brown bears: European, Siberian and Far Eastern parts of Russia have epizootological and epidemiological significance. For the first time, we registered bears in the territory of the Republic of Kazakhstan.

INTESTINAL PARASITES OF THE BROWN BEAR (URSUS ARCTOS LINNAEUS, 1758) IN THE EAST KAZAKHSTAN REGION

The article analyzes the literature data and own research on the distribution and species composition of helminths and eimeria in brown bears in the East Kazakhstan region. The aim of the study was to identify a type of helminth in American black bears (Ursus americanus). The relatively low level of parasite detection in this study is in line with expectations for populations of brown bears (Ursus arctos) living in large areas. Tasks: to identify and study the type of helminths in the brown bear. On the territory of the Russian Federation, the brown bear has 17 species of helminths (including 3 species of trematodes and 14 species of nematodes) and 2 species of protozoa. Most of the discovered species of helminths, eimeria, cryptosporidia both in zoos, circuses, and in the natural habitat of brown bears: European, Siberian and Far Eastern parts of Russia have epizootological and epidemiological significance. For the first time, we registered bears in the territory of the Republic of Kazakhstan.

Occurrence of helminths in shrews and small rodents on territories transformed by reclamation.

Shrews and small rodents inhabit the drainage channel banks in reclai med areas and have their own helminth complex. The aim of the study is to conduct the 3rd research period during 2015-2019 the helminth fauna of these animals living on the drainage channel banks of model reclamation systems in Brest Polesie (south-western part of Belarus), to establish the species composition of helminths and the animal infection by these, and to compare the data obtained with previous research periods. 4,000 trap-days were worked out. 151 specimens of shrews of 4 species and 510 small rodents of 8 species were caught. Animals were examined by the method of complete helminthological dissections. Their numbers were 3.78 and 12.75 individuals per 100 trap-days, and helminth infection was 94.7% and 65.9%, respectively. 66 helminth species were found in animals. The dominant helminth species in infection have been identified. The trematode Prosolecithus danubica Tkach et Bray, 1995 (definitive host: common shrew), the acanthocephalans Centhrorhynchus aluconis (Müller, 1780) (larval host: lesser shrew) and Moniliformis moniliformis (Bremser, 1811) (definitive host: striped field mouse) are new species of helminths for Belarus. New hosts in Belarus have been found for 6 helminth species. Shrews and small rodents are involved in the life cycles of bird, non-ruminant artiodactyl and carnivorous mammal helminths. Nine helminth species have significance for medicine and 7 species for veterinary science. The results are compared with data from the 1st (1996-1999) and 2nd (2005-2010) research periods.

Helminth Fauna of Bats in the Rostov Region: Review. 1. Nematoda

Introduction. Bats (Chiroptera) are the least studied group of mammals in many regions of Russia. At the same time, the chiropterans are known to be one of the largest orders of Mammalia, which can act as hosts and carriers of various pathogenic fungi, bacteria and viruses. However, the parasitic fauna of this group of animals is poorly investigated. The study of bat-parasitizing worms has great practical importance, since bats, due to their ancient origin, are a very detached order. Endoparasites, including the chiropteran helminths, have not been previously studied in the Rostov region. According to the available data, the up-to-date research on the bat parasites in Russia has been carried out only in the Saratov region and in the Republic of Mordovia. The aim of this series of articles is to study the helminth species composition parasitizing in chiropterans in the Rostov region. In the first report we present the data on nematodes.Materials and Methods. The materials for the research were the articles from the open access literature databases: PubMed (pubmed.ncbi.nlm.nih.gov), Cyberleninka (cyberleninka.ru), GoogleScholar (https://scholar.google.com ), etc. The main method used was the analysis of the collected data.Results. The authors were the first to reveal that 27 nematode species from 14 genera, 8 families, 4 orders and 2 classes can be found in 15 bat species living in the Rostov region. The numerous Chromadorea class is represented by 21 species, 12 of which are found in Russia.Discussion and Conclusion. The results of the literature sources analysis showed that the largest number of nematode species parasitize in two chiropteran species living in the Rostov region: in the Daubenton's bat (15 species) and in the common noctule (14 species). Only one species has been recorded in the northern bat. Most nematode species parasitize specifically in bats and have a direct life cycle. (e.g., species of the genus Molinostrongylus). For some species, such as Pterygodermatites bovieri and Litomosa spp., the intermediate hosts are arthropods and the definitive hosts are various bat species. For three nematode species: Ascarops strongylina, Physocephalus sexalatus and Spirocerca lupi, bats are the paratenic hosts.

Helminth fauna in diurnal birds of prey of the order Falconiformes

The purpose of the research is to study the infection of diurnal birds of prey of the order Falconiformes with helminths and to determine the helminth species composition by the example of the Noyev Kovcheg Conservation Nature’s Nursery in the Altai Territory.Materials and methods. We studied diurnal birds of prey of the order Falconiformes for helminthosis in the Altai Territory, in the Noyev Kovcheg Conservation Nature’s Nursery, in 2022. For the parasitological study of birds, we used laboratory methods of helminthocoprological studies: helminthoovoscopy and helminthoscopy. Species identification was determined by characteristic morphological features of helminth eggs, larvae and fragments. To assess the infeсtion with certain types of helminths, we used standard indicators for parasitological research, namely, infection prevalence and infection intensity amplitude.Results and discussion. In 58 studied diurnal birds of prey of the order Falconiformes, 8 helminth species were identified of which 6 nematode species, namely, Ascaridia galli, Tetrameres sobolevi, Capillaria caudinflata, Heterakis gallinarum, Trichostrongylus spp., and Singamus trachea; 1 trematode species, Strigea spp.; and 1 cestode species, Raillietina echinobothrida. These species occurred throughout all seasons of 2022.

Special features of helminth fauna of Mustelidae in the Polistovsky National Nature Reserve and development factors

The purpose of the research is to study the species composition of helminths of the Mustelidae family taking into account biotopic and trophic factors in the Polistovsky National Nature Reserve.Materials and methods. Faeces of Mustela putorius, Neovison vison, Lutra lutra and Martes martes were studied to determine a helminth fauna composition in the Mustelidae family and the factors affecting its development. Helminth eggs were detected using coproovoscopy. For detection of nematode eggs in the feces, the Forate sugar solution flotation method was used; for detection of trematode and cestode eggs, the successive washing method was used. Sexually mature nematodes of the genus Eucoleus were obtained from the pine marten by the method of B. V. Romashov. Species diagnostics of helminth eggs was carried out according to determinants, monographic and other works. The morphometric study of eggs was carried out using the Screen Meter computer program with an accuracy of 0.001 mm. The final diagnostics was carried out by comparing eggs from the faeces of predators and eggs from mature helminths. To study the trophic factor in helminth fauna development, the faeces composition was studied.Results and discussion. The studied mustelids were infected by nematodes Eucoleus sp., Eucoleus aerophilus and Capillaria putorii, and trematodes Isthmiophora melis and Opisthorchiidae sp. Helminth eggs were found in 42.3% samples. The helminth eggs prevail in the material from the polecat and American mink (60.5%) over that from the otter (30.5%). Stenobionts, stenophagy and morphophysiology determine a low infection rate in the otter versus the mink and polecat. Mixed coniferous-small-leafed forest shows a richer list of helminths than the marsh. The obtained data evidences limited helminth circulation in high moor. It is not possible to differentiate eggs of E. aerophilus and E. trophimenkovi according to the previously proposed shape index due to the high individual variability of eggs. High moor as a specific biotope reduces biodiversity including helminths.

Helminth fauna of mouse-like rodents in the territory of Moscow City

Conditions of the urban environment have a significant impact on the ecology of animals, including helminth communities. The response of the helminth community to ecological imbalance and their adaptation to life in the urban environment remain an urgent problem in parasitology. In this study, we aimed to compare the species diversity and distribution of helminths in urban forest parks with varying degrees of anthropogenic pressure. In urbanized territories of 5 locations of the city of Moscow, the infestation parameters of model rodent species were assessed in comparison with a natural, slightly disturbed territory (the scientific and experimental base “Chernogolovka”). In the four most common rodent species (n = 158), Apodemus agrarius, Sylvaemus uralensis, Microtus arvalis, and Clethrionomys glareolus, caught by Hero's traps, the gastrointestinal tract was removed, the number and species of parasites were determined, and the infestation was assessed by 3 parameters. The species composition of helminths and the presence of three parasite classes in the composition of the helminth fauna of the studied species expectedly corresponded to the characteristics of disturbed areas. In addition, a change in the dominant helminth species (H. polygyrus to H. Spumosa) was noted, which indicated a significant influence of the helminth fauna of synanthropic species on the composition of the parasite communities of wild species living in the city. Our study contributes to the accumulation of information on the species composition of endoparasite communities of murine rodents in the city of Moscow, which is important for compiling an up-to-date epidemiological picture of the city.

The fauna of helminths of mouse-like rodents in the city of Yakutsk and its surroundings

Studies of the helminth fauna of mouse-like rodents were carried out on the territory of the city of Yakutsk and its surroundings. Endoparasites are represented by three classes of helminths. The species composition of helminths was analyzed, and it was found that helminths of the Cestoda class dominated all representatives of micromammalia. It is known that mouse-like rodents are intermediate and reservoir hosts of many helminth species in their life cycle. The species composition of helminths, their diversity and abundance are influenced by the habitat conditions of rodents and the number of populations in the study area.

Species composition of helminths in lake frogs Pelophylax ridibundus (Pallas, 1771) in rivers of the Belgorod Region

The purpose of the research is to identify the species composition of helminths in lake frogs (Pelophylax ridibundus (Pallas, 1771)) caught in rivers of the Belgorod Region.Materials and methods. We studied frogs collected using a hydrobiological net in the rivers in fve Belgorod Region districts during the spring-summer 2016–2019. Species identifcation was performed according to morphological characteristics. The sex of the studied frogs was determined by gonads, and the age was determined based on size data. To assess infection of P. ridibundus with individual helminth species and their distribution, we used standard parameters for parasitological survey, namely, the prevalence, the amplitude of infection intensity, and the abundance index.Results and discussion. As a result of helminthological studies of 122 lake frogs, 17 helminth species were identifed which were widely specifc among representatives of the Ranidae family. Presumably, the identifed species form the basis of the species composition of frog helminths in rivers of the Region. Most of these types of helminths occur throughout the springsummer season without pronounced seasonal dynamics. It was noted that the number of helminth species simultaneously parasitizing in one frog increased with age. Opisthioglyphe ranae is the most often numerically dominant species in the examined areas of the Belgorod Region; and Diplodiscus subclavatus, Pleurogenes claviger and Codonocephalus urnigerus mtc have high abundance at some stations.

BOVINE HELMINTHS IN THE NORTH-WEST OF UZBEKISTAN

The research purpose is to study bovine helminths and their infection rate in the Khorezm Region and the Republic of Karakalpakstan. Helminthological studies were performed in 2020–2022. Thirty nine animals were studied by methods of complete helminthological dissections and 124 individual organs of cattle were studied by methods of partial helminthological dissections. In addition, more than 300 faecal samples were examined by helminthocoprological methods. All the studied animals were infected with helminths. At the same time, 20 helminth species of 16 genera, 11 families, 7 orders and 3 classes were recorded. The studies showed that nematodes were most widely represented in cattle, namely, 13 species, then cestodes that were 5 species. Trematodes included only 2 species. The studied animals were found to have simultaneous parasitism of 2 to 7 helminth species, and no monoinvasion was observed. The species composition of helminths in cattle included geohelminths and biohelminths. Geohelminths were represented by 9 species belonging to the class of nematodes (Chabertia, Bunostoma, Esophagostoma, Ostertagia, Haemonchus, Dictyocaulus and Trichocephalus), and the remaining 11 species (5 cestodes, 2 trematodes and 4 nematodes) were biohelminths.

HELMINTH FAUNA OF THE COMMON CARP CYPRINUS CARPIO (LINNAEUS, 1758) FROM FISH FARMS OF BELARUS

The common carp Cyprinus carpio (Linnaeus, 1758) is one of the widely cultured fish species in fish farms in The Republic of Belarus. The species proportion is 79.7% of total fish production by country. Helminthic invasions are the most common diseases of herbivorous fish. The research purpose is to study the helminth fauna of the common carp from fish farms of Belarus. The article provides literature and own research on the species composition of helminths and their prevalence of this introduced fish species. From 1950 to the present the helminth fauna of the common carp is represented by 19 species: 7 species of monogeneans (genus Dactylogyrus Diesing, 1850 – 3, genus Gyrodactylus Nordmann, 1832 – 2, genus Diplozoon Nordmann, 1832 – 1, genus Eudiplozoon Khotenovskii, 1985 – 1), 4 species of cestodes (genus Caryophyllaeus Gmelin, 1790 – 1, genus Khawia Hsu, 1935 – 1, genus Neogryporhynchus Baer et Bona, 1960 – 1, genus Schyzocotyle Achmerov, 1960 – 1), 6 species of trematodes (genus Bucephalus Baer, 1827 – 1, genus Posthodiplostomum Dubois, 1936 – 1, genus Diplostomum Nordmann, 1832 – 1, genus Tylodelphys Diesing, 1850 – 1, genus Ichthyocotylurus Odening, 1969 – 1, genus Sanguinicola Plehn, 1905 – 1), by ones of nematodes (genus Philometroides Yamaguti, 1935) and acanthocephalus (genus Acanthocephalus Koelreuter, 1771). During the parasitological examinations of the common carp from 5 fish farms in Belarus we have been established its helminths species composition (5 species) and their prevalence. Our findings suggest that carp cultivation in fish farms leads to reduced species composition of parasitic worms.

HELMINTHS OF DONKEYS IN KARAKALPAKSTAN

The purpose of the presented work is to study the helminths of donkeys in the territory of Karakalpakstan and the level of their infestation. Materials for the study were collected in a number of districts of the Republic of Karakalpakstan in 2016–2021. During this period, by complete and incomplete helminthological autopsy according to the method of Academician K. I. Scriabin (1928) examined 31 animals. At the same time, 138 samples of feces were taken from donkeys and their helminthocoprological study was carried out using various methods (the method of Fülleborn, Kalantaryan, Shcherbovich, Darling and the method of successive washings). When determining the species composition of helminths, attention was paid to their morphological features and localization. All examined animals were infested with helminths. It was noted that 49 species of helminths parasitize on donkeys, which belong to 3 classes, 8 genera, 17 families. Studies have shown that helminths found in donkeys combine 43 species of the Nematoda class (87.7%), 4 species of the Cestoda class (8.2%) and 2 species of the Trematoda class (4.1%). Also, helminths that parasitize donkeys are divided into biohelminths and geohelminths according to the cycle of their development. Of the registered helminths, 15 species have been identified as biohelminths and 34 species as geohelminths. These species parasitize in the digestive system (42), respiratory system (2), cardiovascular system (1), abdominal cavity (1), subcutaneous tissue (1) and joints (2) of the host organism.

Helminths of wild ungulates living in different regions of Belarus

The purpose of the research is to study of the features of the fauna of wild ungulates helminths on the different regions of the Belarus.Materials and methods. The research was carried out in the State Research-Production Association "The ScientificallyPractical Center of the National Academy of Sciences of Belarus for bio-resources" and in forestry farms of Belarus. The distribution of ungulates in winter was studied using winter route counts. GPS receivers were used for a reliable assessment of biotope confinement. We used the method of counting game animals by year-round mapping of encounters and tracks with the help of thermal imagers. To assess the seasonal distribution, the structure of the biocenosis was compared with the distribution of wild ungulate species on it. To assess the species selectivity of a certain biocenosis, the share of the species in the biotope and the share of this biotope in the farm were determined. The G-test was used to analyze the obtained materials. Animal feces were examined using the McMaster, sedimentation, and flotation methods.Results and discussion. It is determined that in the model forest areas, the red deer dominates in the structure of ungulates. Biotopes with stand density above 0.6 ungulates sem. Reindeer are used to an insignificant extent (K = -0.2, G = 42.7, P = 0.03). The biotopic distribution of roe deer in spring and autumn does not differ significantly (G = 116.7, P = 0.01). At this time, animals prefer areas with a predominance of broad-leaved species (D or.) (K = 0.86, G = 53.1, P < 0.01). During the rutting season, pinemoss forests are preferred (G = 37.4, P < 0.01). In the warm season, the red deer prefers forests with a predominance of pine trees in the stand (K = 0.6, G = 37.4, P < 0.01). Bilberry pine forests are preferred by females in spring and summer (adults and semi-adults) (K = 0.42, G = 32.4, P <0.01), males – mossy pine forests during the growing season (K = 0.22, G = 28.91, P = 0.03). In the parasitological situation in the red deer population, representatives of the Cestoda class are replaced by representatives of the Trematoda class. Representatives of the class Nematoda, genus Dictyocaulus sp. remain dominant. Representatives of the genus Strongylata, Trichostrongylus and Protostrongylus are constantly present. The genera Chabertia, Neoascaris, Cooperia are replaced, of the Nematoda class into the following genera: Oesophagostomum, Capillaria, Muellerius capillaris of the same class. The coefficient of common species composition of red deer and European roe worms is 46%, European roe and elk – 18, red deer and elk – 22%. On the territory of the Republic of Belarus, a rich species composition of helminths was revealed in European bison and a high degree of occurrence of helminths in this host. More than half of the animals in bison populations are carriers of infection with helminths: Belovezhskaya – 51.3, Polesskaya – 89.05%. Moreover, most of them have one type of helminths (from 50.0 to 66.7%) or two types of helminths (from 25.0 to 38.0%). Three or more types of helminths recorded simultaneously are rare. Representatives of the Nematoda class are 6 times superior to other classes of parasitic helminths (G = 39.8; Р < 0.01).

Паразитозы пищеварительного тракта лошадей, впервые обнаруженные в Забайкальском крае

The results of studying the distribution and species composition of helminths of the digestive tract of horses in the Trans-Baikal Territory are presented. It has been established that these parasites are widespread in this region, affecting animals with an invasion intensity (EI) of up to 90.0%. The identified nematodes of the gastrointestinal tract of horses were assigned to 43 species, of which 18 were found in the Trans-Baikal Territory for the first time. The greatest extensiveness and intensity of invasion by nematodes of the digestive organs were noted in horses in the foreststeppe zone. Also, in two districts of the region, coccidia oocysts, a rare species of protozoa found in horses, were first identified in the Russian Federation.

Структурно-видовая и возрастная оценка гельминтов класса Trematoda Rudolphi, 1808 у овец карачаевской грубошерстной породы в регионе Центрального Кавказа

The species composition of helminths of the class Trematoda Rudolphi, 1808 was studied in sheep of the Karachay rough-haired breed in Kabardino-Balkaria, which is represented by 7 types of helminths: Fasciola hepatica, Dicrocoelium lanceatum, Paramphistomum cervi, P. ichikawai, Liorchis scotiae, Calicophorum calicophorum, Eurytrema pancreaticum. These species met with an extensive invasion, respectively 16,67 %, 40,00 %, 20,00 %, 16,67 %, 13,33 %, 20,00 % and 6.67 % and the intensity of the invasion from 8 to 312 copies / head.

Environmental, anthropogenic, and spatial factors affecting species composition and species associations in helminth communities of water frogs (Pelophylax esculentus complex) in Latvia.

We investigated factors affecting species composition and patterns of species associations in parasite communities of water frogs (Pelophylax esculentus complex), applying the distance-based redundancy analysis for component communities (assemblages harboured by host populations) and Markov random fields modelling for infracommunities (assemblages harboured by individual hosts), respectively. We asked (a) What are the relative effects of variation in environmental, land use (i.e., anthropogenic), and spatial factors on the variation in the species composition of component communities (i.e., in a locality)? and (b) What is the dominant pattern of species associations in infracommunities (in a host individual), and how do these associations vary along environmental and/or anthropogenic gradients? In component communities, the greatest portion of variation in helminth species composition was explained by the combined effects of space, anthropogenic pressure, and NDVI, with the pure effect of the spatial predictor being much stronger than the effects of the remaining predictors. In infracommunities, the probability of occurrence of some, but not all, helminth species depended on the occurrence of another species, with the numbers of negative and positive co-occurrences being equal. The strength and/or sign of associations of some species pairs were spatially stable, whereas interactions between other species pairs varied along the gradient of the amount of green vegetation, from negative to positive and vice versa. We conclude that the processes in parasite infracommunities and component communities in frogs are intertwined, with both bottom-up and top-down effects acting at different hierarchical scales.

Ecological analysis of helminth fauna of wild artiodactyles (Mammalia: artiodactyla) in Karakalpakstan

The purpose of the research is studying current fauna of helminths in wild artiodactyls and analysis of their ecological relationships with populations of representatives of the Artiodactyla in biogeocenoses of Karakalpakstan.Materials and methods. Wild populations of artiodactyls were studied in 2016–2020 in the ecosystems of the Kyzyl Kum, Ustyurt and the lower reaches of the Amu Darya, including the drained bottom of the Aral Sea. Some killed animals (the saiga, Persian gazelle, and Bokharan deer) seized from poachers, as well as those killed by predators and feral dogs in the sanctuaries and reserves of Karakalpakstan were used to collect helminthological material. Wild boars were examined after shooting during the hunting season. A total of 11 saigas, 13 Persian gazelles, 7 Bokharan deer and 16 wild boars, and 213 fecal samples from these animals were examined. The studies were carried out using generally accepted methods of dissection (Skryabin, 1928; Ivashkin et al., 1971) and ovoscopy of animal feces. For a comparative analysis of helminth fauna of the study animals, we used previously collected (1959–1978) parasites from the wild boar, saiga, Persian gazelle and Bokharan deer in Karakalpakstan.Results and discussion. We have found that the fauna of the Artiodactyla is represented by the following 5 species in the biogeocenosis of Karakalpakstan: Sus scrofa nigripes Blan., Cervis elaphus bactrianus Lydek., Gazella subgutturosa Gueld., Saiga tatarica Linn., and Ovis orientalis arcal Gmel., in which we identified 26 helminth species classified as Cestoda, Trematoda and Nematoda. Cestodes are represented by 6 species, trematodes by 2 species, and nematodes by 18 species. The helminth species composition of the study animals is 14 species in pigs, 11 species in Bokharan deer, 13 species in saigas and 14 species in Persian gazelles. Representatives of the genera Taenia, Echinococcus, Fasciola, Schistosoma, Gongylonema and Setaria are common to these animal species. By nature of the biological cycle, the helminths of the study artiodactyls recorded by us can be divided into two groups: monoxenous and heteroxenous. Monoxenous parasites include representatives of the Trichocephalidae (3 species), Trichostrongylidae (2 species), Dictyocaulidae (2 species), Syphaciidae (1 species), and Ascarididae (1 species), whose life cycles proceed without changing hosts. Eighteen species of representatives of cestodes (6 species), trematodes (2 species) and nematodes (10 species) are developed with the involvement of intermediate hosts.

QUALITY AND SAFETY MONITORING OF WATER BIOLOGICAL RESOURCES FROM WATER BODIES OF THE CENTRAL FEDERAL DISTRICT OF THE RUSSIAN FEDERATION

Introduction. There have been given results of the assessment of quality and safety of hydrobionts exampled by fishes as main objects of amateurish fishing in water bodies of the Central Feddral District of the Russian Federation. Fishery water bodies on this territory are exposed to anthropogenic impacts and lead in the concerning volume of polluted effluent discharge in Russia. The purpose of this study is to assess the quality and safety of hydrobionts on the example of fish - the main objects of amateur fishing in the reservoirs of the Central District of the Russian Federation. Material and methods. Fish catching was carried out in the summer-autumn period in 2013-2017. The volume of the survey sample was about 1500 fishes. The species composition of helminths in 15 fish species from three families Cyprinidae, Percidae and pike (Esocidae)is was determined by parasitological examination. The safety of fish was evaluated using parasitological and toxicological methods. Results. Fish from water bodies of the Lipetsk, Tambov, Belgorod, Bryansk and Tver areas has been ascertained to be facultatively available for human consumption. Clinical signs of the disease were observed in fish infected with metacercariae trematodes (posthodiplostomum and apophallus) in the form of black spots on the body. Among the detected worms, 2 species can be potentially dangerous for warm-blooded animals and humans - Pseudamphistomum truncatum (Trematoda: Opisthorchidae) and Apophallus muehlingi (Trematoda: Heterophyidae). Analysis of fish contamination with heavy metals showed excess of the permissible cadmium content in fish tissues. Conclusion. The conducted research showed the urgency and social significance of studies on monitoring for water objects and the need to implement the preventive work with the population in such a densely populated part of the Russian Federation as the Central Federal District.

Quality and safety monitoring of water biological resources from water bodies of the Central federal district of the Russian Federation

Introduction. There have been given results of the assessment of quality and safety of hydrobionts exampled by fishes as main objects of amateurish fishing in water bodies of the Central Feddral District of the Russian Federation. Fishery water bodies on this territory are exposed to anthropogenic impacts and lead in the concerning volume of polluted effluent discharge in Russia. The purpose of this study is to assess the quality and safety of hydrobionts on the example of fish - the main objects of amateur fishing in the reservoirs of the Central District of the Russian Federation. Material and methods. Fish catching was carried out in the summer-autumn period in 2013-2017. The volume of the survey sample was about 1500 fishes. The species composition of helminths in 15 fish species from three families Cyprinidae, Percidae and pike (Esocidae)is was determined by parasitological examination. The safety of fish was evaluated using parasitological and toxicological methods. Results. Fish from water bodies of the Lipetsk, Tambov, Belgorod, Bryansk and Tver areas has been ascertained to be facultatively available for human consumption. Clinical signs of the disease were observed in fish infected with metacercariae trematodes (posthodiplostomum and apophallus) in the form of black spots on the body. Among the detected worms, 2 species can be potentially dangerous for warm-blooded animals and humans - Pseudamphistomum truncatum (Trematoda: Opisthorchidae) and Apophallus muehlingi (Trematoda: Heterophyidae). Analysis of fish contamination with heavy metals showed excess of the permissible cadmium content in fish tissues. Conclusion. The conducted research showed the urgency and social significance of studies on monitoring for water objects and the need to implement the preventive work with the population in such a densely populated part of the Russian Federation as the Central Federal District.