The myxosporean Myxidium rhodei Leger, 1905 is a common parasite of Palaearctic cyprinids localized primarily in the Bowman capsules of fish kidneys. In Lake Baikal, roach Rutilus rutilus has been infected with myxosporidium M. rhodei at a high prevalence (94–100

In this work, the anti-inflammatory potential of secretory-excretory products (SEP) of gull- tapeworm Dibothriocephalus dendriticus and ligula Ligula interrupta plerocercoids was studied for the first time in an in vitro model of LPS-induced activation of macrophages. A monocyte cell line derived from a patient with acute monocytic leukemia, THP-1, was used as a macrophage model. The anti-inflammatory properties of SEP were determined by the content of tumor necrosis factor (TNF) and interleukin-6 cytokines in the incubation medium using commercial kits for enzyme immunoassay. The results of our study indicated that SEP from L. interrupta plerocercoids have a pronounced anti-inflammatory effect, while SEP from D. dendriticus plerocercoids did not have such an effect. Next, we investigated the anti- inflammatory properties of L. interrupta SEP in a carrageenan-induced air-sac inflammation model in mice. A significant decrease in the volume of inflammatory exudate under the influence of L. interrupta SEP was found, as well as an increase in the level of the interleukin-6 cytokine. At the same time, SEP of L. interrupta had no effect on the number of cells per 1 ml of exudate, as well as on the level of the pro-inflammatory cytokine TNF. The low molecular weight fraction of L. interrupta SEP also increased the level of the anti-inflammatory cytokine interleukin-10, which indicates a more pronounced anti-inflammatory effect compared to the high molecular weight fraction. The results obtained, in general, indicate the anti- inflammatory properties of the SEP of L. interrupta plerocercoids. However, the mechanism of anti-inflammatory action has not been elucidated and requires further research.

The purpose of this work is to identify the infection of the Mongolian racerunner Eremias argus Peters, 1869 with tetrathyridia Mesocestoides lineatus (Goeze, 1782) in Ulan-Ude and the adjacent territory. A complete parasitological study of freshly caught specimens of the Mongolian racerunner was carried out according to generally accepted methods. Mongolian racerunners were caught at 4 sites: 1) Silicatny industrial settlement in Ulan-Ude; 2) a village on the southwestern perimeter of Ulan-Ude; 3) a village 22 km south of Ulan-Ude; and 4) steppe agricultural land 28 km southwest of Ulan-Ude. Tetrathyridia M. lineatus was recorded in the Mongolian racerunner at one of these four sites, in the Silicatny settlement of UlanUde (the prevalence was 11.1%; the abundance was 6.28 spec.). Cestodes of the genus Mesocestoides have a complex three-host life cycle. The first intermediate hosts of the genus are arthropods (insects, ticks). The second intermediate hosts are amphibians, reptiles, birds and small mammals. The definitive hosts of the Mesocestoides are carnivorous mammals, mainly foxes, dogs and cats. M. lineatus is circulating in the industrial village on the outskirts of Ulan-Ude and is the causative agent of mesocestoidiasis of carnivores, with the participation of the Mongolian racerunner, that performs the functions of the second intermediate host of this cestode. The detection of the cestode M. lineatus in urban areas only is due to the fact that animals accompanying humans participate in the life cycle of this helminth.

The purpose of this work was to clarify the species composition of acanthocephalans of Baikal waterbirds and to determine their relative abundance in modern environmental conditions. Ninety nine specimens of 13 species of waterfowls were studied by the method of special and complete dissection in Lake Baikal. Birds were studied according to the method given in the work by M. N. Dubinina. Three species of acanthocephalans were recorded: Polymorphus minutus (Goeze, 1782), P. acutis Van Cleave et Starret, 1940, and P. magnus Skrjabin, 1913. To assess the quantitative parameters of host infection, the following indices were used: prevalence of invasion (iP), intensity of invasion (iI, limits) and abundance (A). P. minutus was the most widespread species of acanthocephalans. Acanthocephalans are localized in the small intestine of birds. Polymorphae penetrate very deeply into the small intestine wall of the host. Unlike echinorhynchids whose proboscis penetrates only into the submucosa of the intestinal mucosa of fish, the proboscis and neck of polymorphids pierce the mucous and muscular membranes reaching the serous membrane. Tubercles are observed on the outer, serous side of the intestine that mark places of attached acanthocephalans. With a high number of definitive hosts, they can potentially exert a regulatory influence on the number of bird populations.

Crustaceans of the subclass Branchiura Argulus foliaceus cause argulosis, an invasive disease in fish. Arguluses are temporary ectoparasites. Moving along the surface of the host's body, the crustaceans look for places accessible to blood vessels. After they have sucked blood, they leave the fish. Hemorrhages, wounds and ulcers appear in the affected areas. For free-swimming arguluses, behavioral adaptations are aimed at making the most of meetings with hosts and moving from one host to another. Our study presents data on crustaceans A. foliaceus from the perch from Lake Kenon (Amur River basin). The material was obtained from net catches in the first decade of June 2010. Individuals of the perch of the same size and age groups 2+–4+ were caught at the mouth of the Kadalinka River and in the warm water discharge zone of the Chita CHP-1. According to the results of our research, the relative abundance of argulus in the perch is significantly higher in the area of the mouth of the Kadalinka River than in the warm water discharge zone of the Chita CHP-1. In the springsummer period, the number of crustaceans increases during the spawning of adult fish and the feeding of juveniles in the area of the mouth of the Kadalinka River.

The cytomorphological parameters of hemopoietic organs (pronephros and spleen) of crucian carp ( Carassius auratus L., 1758) infected with Ligula ( Digramma ) interrupta (Logan, 2004) are studied for the first time. The biological material has been obtained from fish in Dolgoe and Cheremukhovoe lakes (the Lake Baikal basin, Buryatia) with an unfavorable digrammosis situation. Infection with plerocercoids causes a hematopoietic transformation: the compensatory activation of erythropoiesis in the pronephros against the background of a low number of mature erythrocytes and a decrease in the proliferative activity of erythroid elements in the spleen.

Аннотация.В заключительной статье по гельминтам водно-болотных птиц Байкальской Сибири проведен итоговый анализ таксономического состава указанных паразитов и распределение их по хозяевам.Материалы касаются 63 видов птиц, относящихся к 7 отрядам: гусеобразные Anseriformes -17 видов, гагарообразные Gaviiformes -2 вида, пеликанообразные Pelecaniformes -1 вид (большой баклан), аистообразные Ciconiiformes -1 вид (серая цапля), поганкообразные Podicipediformes -3 вида, журавлеобразные Gruiformes -один вид (лысуха), ржанкообразные Charadriiformes -38 видов.У водно-болотных птиц Байкальской Сибири всего выявлено 243 вида гельминтов из 4 классов, 47 семейств, 113 родов.Наиболее богатым в таксономическом отношении оказался класс трематод -107 видов, распределенных по 10 отрядам, 14 семействам и 50 родам.Далее идет класс цестодов, представленный 94 видами из 3 отрядов, 9 семейств и 42 родов.Нематодов выявлено немного -36 видов из 5 отрядов, 12 семейств и 18 родов, еще меньше скребней -5 видов, представляющих один отряд, одно семейство и три рода.Приведен видовой состав гельминтов по всем 63 видам птиц.Недостаточность материала по многим видам не позволила выявить общую картину зараженности их гельминтами, лишь по некоторым видам уток, поганкам, куликам и чайкам получены хорошие результаты.

Аннотация.Приведен видовой состав гельминтов 8 видов птиц из семейств гагаровые (краснозобый и чернозобый гагары), баклановые (большой баклан), цаплевые (серая цапля), поганковые (чомга, черношейная и красношейная поганки) и пастушковые (лысуха) Байкальской Сибири.Общий объем материала небольшой, всего вскрыто 94 птицы, из них основная доля принадлежит чомге и лысухе, остальные виды представлены 2-7 особями.У чомги выявлено 46 видов гельминтов: цестод 13 видов

Впервые приводятся данные о заражённости гельминтами длиннокрылой широколобки Cottocomephorus inermis Баргузинского залива (оз. Байкал). Всего обнаружены восемь видов паразитов, относящихся к пяти классам. Выявлены различия в составе гельминтофауны длиннокрылой широколобки разного возраста.

This is the first report on the infection of longfin Baikal sculpin Cottocomephorus inermis of Barguzinsky Bay (Lake Baikal) by helminths. A total of eight species of parasites belonging to five classes have been identified. The differences in the composition of the helminth fauna of longfin Baikal sculpin of different ages have been revealed.

The cytomorphological composition of the blood and mesonephros of goldfish infected with Ligula interrupta has been studied under the conditions of the native range. A decrease in the total number of leukocytes and neutrophils in the blood at all stages of development and deregulation of the proliferation and differentiation of lymphoid, pseudo-eosinophilic, and pseudo-basophilic elements in the studied organs are established. Infiltration of neutrophilic mesonephros by low-differentiated forms is observed. It has been shown that, in this parasitic system, the partner relations cause the launch by L. interrupta of mechanisms that regulate the host immune response by inhibiting the acute inflammatory response and the development of mild chronic inflammation. B-cell activation in the immune response is accompanied by processes of cellular degeneration and immunosuppression, factors that are actively involved in cytotoxic reactions.

Проведен эколого-фаунистический анализ гельминтов подотряда ржанковых птиц Байкальской Сибири.Основной материал собран на оз.Байкал.Установлено систематическое разнообразие гельминтофауны, которая насчитывает 88 видов из 4 классов и 17 семейств.В видовом отношении преобладали цестоды (40,9 % видового богатства), трематоды составляли чуть более одной трети (34,1), нематоды -одна пятая часть (23,7), скребни -единицы (1,1).Соотношение представителей разных классов паразитов в подсемействах ржанковых птиц заметно отличалось.У одних (ржанков, бекасовых и песочников) преобладали цестоды, у других (чибисовых, камнешарок, веретенниковых, улитов и плавунчиковых) -трематоды.Наибольшее видовое богатство паразитов отмечено у куликаворобья, фифи, мородунки.Широкий круг хозяев среди ржанковых птиц имели цестоды Aploparaksis sachalinensis,