Поиск по автору "Yurakhno, V."
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Материал First report of Auerbachia chakravartyi (Myxosporea: Bilvavulida) from the gallbladder of Torpedo scad (Megalaspis cordyla) in Vietnam(Севастополь, 2019) Chinh, Nguyen Ngoc; Ngo, Ha Duy; Yurakhno, V.; Doanh, Pham NgocМатериал Molecular characterization of Kudoa nova (Myxosporea: Multivalvulida) infecting the round goby Neogobius melanostomus from the Sea of Azov(2012) Pascual, S.; Abollo, E.; Yurakhno, V.; Gaevskaya, A.Diagnosis of Kudoa nova infecting the skeletal muscle tissue of round gobiid Neogobius melanostomus collected in the Sea of Azov was done by adding molecular data to the demographic and morphological characterizations of the parasite. The small subunit (SU) ribosomal DNA sequence analysis revealed Kudoa nova cluster within clade that includes Kudoa paniformis, Kudoa dianae, Kudoa sp., Kudoa miniauriculata, Kudoa alliaria and Kudoa rosenbuschi. Results on the molecular sequence data of Kudoa nova provide new evidence to discuss the hypothesis of tissue tropism playing an important role in the radiation of kudoids.Материал Morphology, histology and phylogeny of Henneguya sinova sp. nov. (Myxobolidae: Myxozoa) infecting gills of Parablennius tentacularis in the Black Sea, Turkey(2016) Özer, A.; Özkan, H.; Gürkanlı, C. T.; Yurakhno, V.; Çiftçi, Y.Myxosporeans of the genus Henneguya have a global distribution and infect organs and tissues of both marine and freshwater fishes. Here we describe the morphological, histological and molecular characteristics of Henneguya sinova sp. nov. parasitizing the gill arches of tenta-cled blenny Parablennius tentacularis (Perciformes: Blenniidae) collected from the coast of Sinop on the Black Sea in Turkey. Several oval whitish plasmodia of different sizes in the gill arches of fish were found. The mature spores were rounded oval in frontal view, with a mean (range) total length 57.5 (51.5-68.0) µm; the spore body was 11.7 (11.3-12.0) µm in length by 7.6 (7.3-8.3) µm in width and 6.7 (6.6-6.8) µm in thickness. The caudal appendages, measuring 46.0 (40.0-55.0) µm in length, were very thin at the tapered end. The prevalence of infection by H. sinova sp. nov. was 35.5%. Phylogenetic analysis of nuclear small subunit ribosomal DNA (SSU rDNA) clearly suggested H. sinova as a new species which is clustered within the marine Henneguya lineage. Pairwise nucleotide similarities and DNA distance values of SSU rDNA between H. sinova sp. nov. and other related Henneguya species also supported this suggestion.Материал The infestation status of symbiotic crustaceans on the swimming crab Charybdis truncata (Fabricius, 1798) from Nha Trang Bay, Vietnam (the East Sea)(2024) Le, Thi Kieu Oanh; Vo, Thi Ha; Nguyen, Phuong Lien; Yurakhno, V.; Binh, Thuy DangSymbioses are common relationships between organisms in marine ecosystems. Out of crabs belonging to the family Portunidae, an economically important one, Charybdis truncata (Fabricius, 1798) is a widely distributed species. However, the studies on its symbiotic assemblages are still limited. A total of 408 C. truncata were sampled in Nha Trang Bay (Khanh Hoa province, Vietnam, the East Sea) in January–August 2022. Symbionts were classified based on morphological characters. Statistical analysis was applied to compare the infestation status of symbionts. Six symbiotic species were detected, including four epibiotic barnacles [Octolasmis angulata (Aurivillius, 1894), Octolasmis alata (Aurivillius, 1894), Octolasmis warwicki Gray, 1825, and Dianajonesia tridens (Aurivillius, 1894)] and two obligate unidentified parasites [Cancrion sp. and Sacculina sp.]. Out of them, O. alata and Cancrion sp. were recorded on C. truncata for the first time. The overall prevalence of symbionts on the swimming crab hosts was 13%, and the number of infecting symbiont species on hosts ranged within 1–4. O. angulata was the dominant species, with the prevalence of 6.9%. The prevalence of this symbiotic species was significantly higher in ovigerous female crabs compared to non-ovigerous ones. Moreover, there was a noticeable rise in O. angulata prevalence rates as crab size increased. No significant differences were revealed in the mean intensity of symbionts by sex, reproductive status of females, and size of the crab hosts. The initial morphological modifications caused by infecting parasites, Cancrion sp. and Sacculina sp., were recorded and described. These findings provide data on the status of natural infection of symbiotic species on C. truncata as a basis for the management of commercial species and aquaculture development.