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    Comparative Study on Parasite Fauna of the Whiting Merlangius merlangus in the Northern and Southern Zones of the Black Sea
    (Central Fisheries Research Inst, 2015) Ozer, Ahmet; Kornyychuk, Yulia M.; Ozturk, Turkay; Yurakhno, Violetta
    The comparative parasite fauna of the whiting Merlangius merlangus (Linnaeus, 1758) in the Black Sea was determined using samples collected from the southern zone of the Sea near Sinop, Turkey and from the northern zone in Balaklava Bay, Sevastopol, Russia. The parasitological survey was conducted monthly between May 2011 and April 2014 on 690 fish from Sinop and 423 fish from Sevastopol. A total nine parasite species were identified which eight of were found at both sampling localities. Trichodina gobii Raabe, 1959, Eimeria merlangi Zaika, 1966, Ceratomyxa merlangi Zaika, 1966, Myxidium gadi Georgevitsch, 1916, Gyrodactylus alviga Dmitrieva and Gerasev, 1997, Hysterothylacium aduncum (Rudolphi, 1802) larvae and adults, Scolex pleuronectis Muller, 1788 plerocercoids and Grillotia erinaceus (van Beneden, 1858) plerocerci were recorded from both sampling localities whereas Prodistomum polonii (Molin, 1859) Bray and Gibson, 1990 was found only once in the Sevastopol samples. This study revealed considerable differences in the prevalence and abundance values of T. gobii, Gy. alviga, Gr. erinaceus and H. aduncum between the two regions indicating two distinct groups of whiting thus supporting other studies suggesting a complex structure of whiting stocks in the Black Sea.
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    First report of Ceratomyxa scorpaeni (Cnidaria: Myxozoa) from Scorpaena porcus in the Black Sea
    (Magnolia Press, 2021) Okkay, Sevilay; Gurkanli, C. Tolga; Ciftci, Yilmaz; Yurakhno, Violetta; Ozer, Ahmet
    Members of the class Myxosporea Butschli, 1881 have a cosmopolitan distribution in a wide variety of fish species worldwide. In the present study, the black scorpionfish Scorpaena porcus collected from the Sinop coasts of the Black Sea was investigated for myxosporean parasites using both conventional and molecular methods in the period between September 2015 and August 2019. Using morphological and morphometric data, the myxosporean parasite Ceratomyxa scorpaeni Garbouj, Rangel, Castro, Hmissi, Santos, Bahri, 2016 was identified in the gall bladder of host fish. Molecular analysis of the 18S rDNA gene confirmed the identity of this parasite as C. scorpaeni. This is the first report of its occurrence in the Black Sea.
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    First report of Eimeria sardinae (Apicomplexa: Coccidia) from the Turkish coast of the Black Sea
    (2014) Ozer, Ahmet; Öztürk, Türkay; Yurakhno, Violetta; Kornyychuk, Yulia M.
    Karadeniz'in Sinop kıyılarından Mayıs 2011 - Mayıs 2013 tarihleri arasında yakalanan mezgit balığının, Merlangius merlangus L., 1758, parazitleri araştırıldı ve incelenen 530 adet balıktan Mart 2012 tarihinde yakalanan 1 adedinin barsak içeriğinde çok sayıda Eimeria sardinae (Thélohan, 1890) Reichenow, 1921 ookistinin varlığı belirlendi. Bu parazit türü ne Karadeniz'in Türkiye kıyılarında ne de mezgit balığında daha önce bildirilmedi. Dolayısıyla bu tür Türkiye parazit faunası için yeni bir kayıttır, fakat mezgit balığı bu tür için gerçek bir konak olmayabilir. Mezgit balığının bağırsak içeriğinde bulunan E. sardinae ookistleri bu parazitin konağı olduğu bilinen ve mezgit balığının doğal besinini oluşturan Sprattus sprattus ya da Engraulis encrasicolus gibi avlar ile alınmış olabilir
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    First Report of Several Myxosporean (Myxozoa) and Monogenean Parasites from Fish Species off Sinop Coasts of the Black Sea
    (2015) Özer, Ahmet; Özkan, Hakan; Güneydağ, Sevilay; Yurakhno, Violetta
    Mart - Temmuz 2014 tarihleri arasında Karadeniz'in Sinop kıyılarından olta ile yakalanan kaya balığı Neogobius melanostomus, dil balığı Solea solea, horozbina balıkları Parablennius sanguinolentus, Parablennius tentacularis ve Salaria pavo ve isparoz Diplodus annularis bilinen mevcut yöntemler uygulanarak Sinop Su Ürünleri Fakültesi'nde miksozoa ve monogenea parazitleri yönünden incelendi. Kaya balığında Ortholinea gobiusi; dil balığında Sinuolinea rebaee; Parablennius sanguinolentus türü horozbina balığında Sphaeromyxa sevastopoli, Ortholinea divergens ve Myxobolus asymmetricus; Parablennius tentacularis türü horozbina balığında Myxobolus asymmetricus ve Myxidium parvum; Salaria pavo türü horazbina balığında Myxidium parvum ve isparoz balığında Lamellodiscus elegans ve Lamellodiscus fraternus türleri tanımlandı Tüm morfometrik ölçüm değerleri tablolarda gösterildi. Bu araştırmadaki tüm bulgular Karadeniz'in Türkiye kıyıları için yenidir ve tanımlanan tüm miksozoa türleri de Türkiye parazit faunası için yeni kayıttır. Ayrıca, S. rebae Karadeniz miksozoa faunası için de yenidir
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    Grillotia erinaceus (van Beneden, 1858) (Cestoda:Trypanorhyncha) from whiting in the Black Sea, with observations on seasonality and host-parasite interrelationship
    (Walter De Gruyter Gmbh, 2014) Ozer, Ahmet; Ozturk, Turkay; Kornyushin, Vadim V.; Kornyychuk, Yulia; Yurakhno, Violetta
    The genus Grillotia Guiart, 1927 is cosmopolitan in its distribution and the type-species, G. erinaceus (van Beneden, 1858), has been relatively well studied. However, this study provides infection indices of Grillotia erinaceus from southern and northern Black Sea whiting Merlangius merlangus for the first time. The specimens of Grillotia erinaceus were obtained from subserosa of the anterior oesophagus, stomach, pyloric caeca, liver, ovaries and mesenterium of whiting caught by commercial fishing vessels off Sinop, Turkey and off Balaklava, Ukraine. Fish were examined during the period from May 2011 to April 2012. Prevalence and mean intensity values in 268 fish collected off Sinop in the Black Sea were 18.66% and 1.82 +/- 0.16 parasites per infected fish, respectively. In Ukrainian 166 whiting samples collected off Balaklava in the Black Sea, however, G. erinaceus plerocercus infection prevalence was 10.24% and mean intensity 1.71 +/- 0.75 parasites per infected fish. Infection parameters were also determined at both sampling sites in relation with host length, sex and season.
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    Light and Scanning Electron Microscopic Observations on Grillotia erinaceus (Cestoda: Trypanorhyncha)
    (Istanbul Univ Press, Fac Aquatic Sciences, 2020) Ozer, Ahmet; Ozturk, Turkay; Okkay, Sevilay; Yurakhno, Violetta; Kornyychuk, Julia
    In the present study, the plerocercoids of Grillotia erinaceus were obtained from the wall of the anterior oesophagus, stomach, pyloric caeca and liver of teleost Black Sea whiting Merlangius merlangus and adults were collected from the intestine of elasmobranch thornback rays Raja clav- ata caught by commercial fishing vessels off Sinop, Turkey. Standard parasitological investigation methods were applied and morphological diagnostic features of the whole parasite, bothria, scolex, tentacular armatures and tentacles were studied in detail using a light and Scanning Elec- tron Microscope (SEM). The plerocercoids of this parasite had a total length of 5.96 mm on average and this was 21.6 mm on average in adults. The measurement data of all morphological diagnostics are provided and photomicrographs of each part of the parasite are presented. This study also provides the detailed morphological features of both plerocercoids and adults of G. erinaceus in M. merlangus and R. clavata for the first time in the Turkish coasts of the Black Sea.
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    Molecular and morphological description of Ceratomyxa scophthalmi sp. nov. (Myxozoa) infecting Scophthalmus maeoticus and first report of Myxidium finnmarchicum in the Black Sea
    (Inter-Research, 2022) Ozer, Ahmet; Gurkanl, Cem Tolga; Okkay, Sevilay; Ciftci, Yilmaz; Yurakhno, Violetta
    In the present study, 2 species of myxozoan parasites, the novel Ceratomyxa scophthalmi sp. nov. and Myxidium finnmarchicum, were documented from the gallbladder of Scophthalmus maeoticus inhabiting the Turkish Black Sea coast at Sinop. C. scophthalmi sp. nov. had mostly spherical, clavate, and fine-grained polymorphic plasmodia that ranged in diameter from 16.0 to 29.0 mu m. Spores were arcuate with a convex anterior margin and concave posterior. Valves of spores were highly elongated and unequal in thickness with one valve 1.1-1.3 times thicker than the other. Valves narrowed gradually toward slightly truncated ends. The mean (range) dimensions of spores were 9.4 (8.5-10.0) mu m in length and 49.6 (44.5-55.0) mu m in thickness, with polar capsules that were 3.1 (2.7-3.5) mu m in length and 3.2 (2.7-3.5) mu m in width. Polar filaments were coiled with 4-5 turns. Large numbers of immature forms of C. scophthalmi sp. nov., which were often 'crumpled', and mature forms were found together in the gallbladder bile. Along with morphological differences, phylogenetic analysis based on 18S rDNA, including pairwise nucleotide similarities with other related Ceratomyxa species, suggests C. scophthalmi as a novel species. Moreover, this report provides the first morphological and molecular descriptions of M. finnmarchicum outside of its original geographical location and type host species.
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    New Host and Geographical Records of Ortholinea orientalis (Schulman and Schulman-Albova, 1953) (Myxozoa, Myxosporea), a Parasite of Marine Fishes
    (Inst Zoology, Bas, 2015) Ozer, Ahmet; Ozkan, Hakan; Yurakhno, Violetta
    Ortholinea orientalis (Schulman and Schulman-Albova, 1953) is reported from the urinary bladder of the fish hosts Alosa tanaica (Clupeidae) and Mullus barbatus ponticus (Mullidae) from the Black Sea. Infection prevalence is 33.3% and 2.5% in M barbatus ponticus and A. tanaica, respectively. A morphometric description of the spores is provided. This paper provides the first records of O. orientalis in Alosa tanaica and M barbatus ponticus, and the first detection of this parasite in the Black Sea. This is also the first record of O. orientalis from Turkey.
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    TRICHODINA GOBII (CILIOPHORA: TRICHODINIDAE) ON WHITING MERLANGIUS MERLANGUS WITH A CHECKLIST FROM TURKISH AND RUSSIAN COASTS OF THE BLACK SEA
    (Hungarian Natural History Museum, 2015) Ozer, Ahmet; Ozturk, Turkay; Kornyychuk, Yulia M.; Yurakhno, Violetta
    Trichodina gobii was identified during a parasitological survey conducted on the parasite fauna of whiting, Merlangius merlangus at both Sinop (Turkey) and Sevastopol (Russia) coasts of the Black Sea in the period between May 2011 and March 2014. Its morphological characteristics and taxonomic affinities with other previous reports on this species were revealed. The ecological occurrences in relation with seasonality, host length and sex of whiting were also determined. Parasitological indices were calculated from 690 and 423 whiting specimens collected in Sinop and Sevastopol, respectively. Overall infestation prevalence (%) and mean intensity and mean abundance values were 45.6%, 70.1 +/- 10.4 and 32.0 +/- 4.9, respectively, in Sinop, while they were 6.9%, 29.2 +/- 10.1 and 2.0 +/- 0.8 in Sevastopol. The taxonomic affinities to other trichodinid species and ecological data are discussed in detail.