The article presents the original findings of Paracoenogonimus ovatus (Katsurada,1914) in fish in the Southern Bug and the Inhul rivers in Mykolaiv Region in 2012-2014. The roach (Rutilus rutilus), silver bream (Blicca bjoerkna), bream (Abramis brama), crucian (Carassius gibelio), rudd (Scardinius erythrophthalmus), pike (Esox lucius), pikeperch (Sander lucioperca) were found to be infected with metacercariae of P. ovatus. Metacercariae of P. ovatus are described based on the original material. The highest prevalence of infection was observed in the roach, 82.3 %, the pike was infected in the less degree, with prevalence of 15.3 %. The infection intensity was highest in the roach, up to 247 specimens; that of the pikeperch was the lowest - 17 specimens. The highest occurrence of P. ovatus was observed in the parts of the river Southern Bug in Zhovtnevy, Mykolaiv, Novoodesky Districts, whereas in Voznesenky, Pervomaysky Discticts and in the city of Mykolaiv the occurrence was the lowest. In the area of the river Inhul the parasite was observed mostly in the waters of Bashtansky District in Mykolaiv Region.
In blood of frogs in two of seven studied biotopes the presence of the genus Hepatozoon representatives was revealed. Morphometric parametres allowed defining a specific accessory of the revealed haemoparasite Hepatozoon in a blood channel of village Malozaharino frogs which were closest to the species H. magna (Grassi et Feletti, 1891) Labbe, 1899
Strongylid Community Structure of the Przewalski's Horses (Equus ferus Przewalskii) from the Biosphere Reserve "Askania-Nova", Ukraine
Species composition and the structure of strongylid community of the Przewalski's horse (Equus ferus przewalskii Poljakov, 1881) semi-free population at the "Askania-Nova" Biosphere Reserve were studied by the in vivo method of diagnostic deworming. After deworming of 24 adult Przewalski's horses by the anthelmintic "Univerm" (0.2% aversectin C, Russia), 25,815 strongylid specimens were collected and identified. Thirty-one strongylid species of 12 genera were found including 6 species of the subfamily Strongylinae and 25 — of Cyathostominae. Nine to 18 strongylid species (average 14.5 ± 2.5) were found per horse. Cyathostomes (Cyathostominae) dominated in the Przewalski's horse strongylid community: 9 species (Cyathostomum catinatum, C. pateratum, Cylicocyclus nassatus, C. insigne, C. leptostomum, C. ashworthi, Cylicostephanus longibursatus, C. goldi and C. minutus) were found in more than 80% of horses examined and composed 94.1% of the total number of strongylid collected. Strongyles (Strongylinae) were found in 100% of the E. ferus przewalskii examined; prevalence of separate species was from 4.2% to 58.3%. The general structure of the strongylid community was multimodal with dominant (9 species), subdominant (4), background (4) and rare (14) species. The list of strongylid species found in the Przewalski'si horses in Ukraine was enlarged to 37 species.
Helminth Fauna of Roe Deer (Capreolus Capreolus) in Ukraine: Biodiversity and Parasite Community
The results of survey of helminth species diversity of roe deer (Capreolus capreolus Linnaeus, 1758) from nine regions of Ukraine are presented. Ninety-two roe deer from Chernigivska, Zhytomyrska, Kyivska, Vinnytska, Rivnenska, Ternopilska, Khmelnitska, Sumska and Cherkasska regions were examined by the partial helminthological dissection. Totally 30,753 helminth specimens were collected and identified by morphological criteria. Prevalence of roe deer infection with helminths was 92.4%. Sixteen helminth species (1 of the Class Trematoda, 2 — of Cestoda and 13 — of Nematoda) were found. Setaria cervi (prevalence — 10.9%) was found in visceral cavity. Dictyocaulus eckerti (6.9%) and D. capreolus (2.3%) was found in lungs. Taenia hydatigena larvae (2.3%) were found in mesentery. Paramfistomum cervi (10.9%), Haemonchus contortus (57.6%), Ashworthius sidemi (40.2%), Marshallagia marshalli (15.2%), Nematodirus oiratinus (1.1%), Trichostrongylus axei (3.3%) were found in stomach. Moniesia expansa (1.1%), Bunostomum phlebotomum (10.9%) were found in small intestine. Trichocephalus ovis (18.5%), Oesophagostomum venulosum (7.6%) and O. dentatum (1.1%) were found in caecum. Chabertia ovina (28.3%) was found in large intestine. Forty-four helminth associations were separated in the roe deer examined.
Dynamics of Infection with Strongylidae of the Przewalski Horse (Equus Przewalskii) Population in the Chernobyl Exclusion Zone
Dynamics of Infection with Strongylidae of the Przewalski Horse (Equus przewalskii) Population in the Chernobyl Exclusion Zone. Zvegintsova N. S., Zharkikh T. L., Yasynetska N. I. — In 1998 and in 1999, several Przewalski horses (PH) from the Reserve Askania Nova were transferred to the Chernobyl Exclusion Zone (CEZ), a free-roaming breeding population was therefore established. Parasitological monitoring of the population was carried out between 1998 and 2006. Before the transportation, PHs were dewormed with Albendazole. On arrival, the PHs were placed in large pasture enclosures for acclimatization, where they were kept between a few weeks and eight months before releasing into the wild. Besides PHs, some domestic working horses were kept in the enclosures. After transportation to CEZ, the level of infection with intestinal helminths in PHs increased. Probably, it was due to the following factors: 1) larvae of helminthes, which survived in intestines after deworming, developed, 2) the pasture in acclimatization enclosures was contaminated with parasites, as PHs shared the enclosures with domestic horses. Over the first three years, the prevalence of Strongylidae were 98.8%, the mean intensities varied from 248.0 ± 51.3 to 612.0 ± 278.2 eggs per gram faeces (epg). A mean intensity in bachelor males was higher than in members of harem groups, as the bachelors had closer contacts with domestic horses. After domestic horses had been transferred outside of CEZ in 2001, the overall intensity in PHs has progressively decreased. During 2004-2006, the mean intensity became stable with range 80.9 ± 25.5 to 138.9 ± 33.2 epg, with prevalence of 93.1%. In 3.5% of faecal samples, Parascaris equorum (Ascarididae) were found; a mean intensity was 29.0 ± 10.7 epg. A few eggs of Anoplocephala perfoliata (Anoplocephalidae) were found in three samples only. Due to negligible contamination of pastures excluded from farming industry long ago, there are comparatively low levels of infection in the free-roaming PHs. The present level of infection is considered harmless to the horses as clinical symptoms of helminthoses were never noticed.