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    An epizootiological study on Mothocya epimerica Costa, 1851 (Flabellifera: Cymothoidae) infestations in sand smelt, Atherina boyeri Risso, 1810 (Perciformes: Atherinidae) found in the Sinop coasts of the Black Sea.
    (Turkish Journal of Marine Sciences, 2002) Özer, Ahmet
    In this study, a parasitic isopod, Mothocya epimerica (Flabellifera: Cymothoidae) is reported on the Sand Smelt, Atherina boyeri, from a small stream in the Sinop coast of the Black Sea. A total of 320 fish were investigated throughout the study period. All specimens of M. epimerica were found in the branchial cavities of Atherina boyeri. Infestation prevalence determined was 5% in overall samples, while it was 21.3% in April, the only month in which infestation recorded. Male fish were found to have higher infestation level than female fish. A slight increase in the infestation prevalence was also recorded as the size of fish increased.
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    Atlantik Salmonu ( Salmo salar L., 1758)’nda Görülen Sphaerospora truttae (Sphaerosporidae: Myxozoa) Enfeksiyonunun Tedavisi Üzerine Bir Araştırma
    (Ege Üniversitesi Su Ürünleri Dergisi, 2002) Özer, Ahmet
    In this study that was started in July 1997, a treatment on the extrasporogenic stages of S. truttae using two different dosages of Monensin (25-50 mg kg -1 ) and Metranidazole (25-50 mg kg -1 ) and application of bath of Malachite Green (1.5 ppm) baths and Malachite Green (1.5 ppm) + Formaldehyde (20 ppm) baths to Atlantic salmon finge rlings weighing 2.5 – 3 g. was studied. The treatment was lasted for 7 days in all groups. Fish were exam ined in the intarvals of 15 days and it was determined that Monensin (50 mg/kg) and Metranidazole (50 mg kg -1 ) caused a delay in the appearence of the extasporogenic stages, while Malachite Green (1.5 ppm) and Malachite Green (1.5 ppm) + Formaldehyde (20 pp m) caused a decrease in the infection.
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    Comparative Invasive Asian Tapeworm Bothriocephalus acheilognathi Infections on the Lower Kızılırmak Delta Fishes
    (Journal of Academic Documents for Fisheries and Aquaculture, 2014) Öztürk, Türkay; Özer, Ahmet
    In the present study, the occurrence of invasive Asian tapeworm Bothriocephalus acheilognathi in different fish species from Bafra fish lakes, the Lower Kızılırmak Delta, Turkey, was investigated. A total of 1329 fish specimens of Cyprinus carpio, Vimba vimba, Carassius gibelio, Scardinius erythropthalmus, Neogobius fluviatilis, Proterorhinus marmoratus, Pomatoschistus marmoratus, Mugil cephalus, Liza aurata, Sander lucioperca, Aphanius danfordii, Gambusia affinis, Gasterosteus aculeatus, Atherina boyeri, Cobitis taenia and Syngnatus acus belonging to 10 different families were examined. Routine parasitological investigation procedures were applied to fish specimens. The number of cestode recovered from each fish species was counted and infection prevalence (%) and mean intensity values (number ± standard.error) were calculated. B. acheilognathi was recorved from the intestine of C. carpio, V. vimba, C. gibelio, N. fluviatilis, Pr. marmoratus, S. lucioperca, A. danfordii, G. affinis and A. boyeri. C. carpio (26.72% and 16.66 ± 2.39) and V. vimba (20% and 5.88 ±1.85) had the highest infection prevalence and mean intensity values among all infected fish. This research study revealed that C. gibelio, Pr. marmoratus, S. lucioperca, A. danfordii and G. affinis are the new host records for B. acheilognathi in Turkey.
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    Dactylogyrus cornu Linstow, 1878 (Monogenea) Infestations on the Vimba (Vimba vimba tenella Nordmann, 1840)in relation to the host factors.
    (Turkish Journal of Veterinary and Animal Sciences, 2005) Özer, Ahmet; Öztürk, Türkay
    The infestation by a relatively less known monogenean, Dactylogyrus cornu Linstow, 1878, was investigated on vimba, Vimba vimba tenella Nordmann, 1840 in a small stream pouring into the Black Sea in Sinop, Turkey. A total of 122 fish specimens were examined in June 2000. The overall infestation prevalence and mean intensity levels were 100% and 147.7 ± 7.9 parasites per infested fish, respectively. D. cornu was recorded only on the gills of host fish and possible site specificity to the filaments of the second gill arches of the left and right gill arch sets was recorded. The parasite was also found to be settled more on female and larger host fish.
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    Digenean metacercariae parasitic in fishes in Sarıkum Lagoon Lake, Sinop, Turkish Black Sea coast: Species diversity, seasonal occurrence and histopathological effects
    (Bulgarian Academy of Sciences, 2019) Öztürk, Türkay; Özer, Ahmet
    The study aimed to identify the digenean metacercariae parasitic in fishes in the Sarıkum Lagoon Lake located at the Black Sea coast of Turkey. A total of 906 fish specimens belonging to 6 fish species (Aphanius danfordii, Neogobius melanostamus, Proterorhinus marmoratus, Gasterosteus aculeatus, Platichthys flesus and Chelon auratus) were examined monthly during a period of one year. Four digenean species recorded as encysted metacercariae were identified; these were three species belonging to Heterophyidae, i.e. Ascocotyle coleostoma, Pygidiopsis genata and Cryptocotyle concava, and one species of the family Diplostomatidae, i.e. Posthodiplostomum sp. Ascocotyle coleostoma was found to be the dominant species and detected in all examined fish species. Posthodiplostomum sp. was detected only in A. danfordii. Cryptocotyle concava was detected in N. melanostamus and P. marmoratus. Infection prevalence and intensity were calculated and discussed for each digenean species recorded as metacercariae in relation to season. The eye, heart and gill tissues of infected fish with parasites were examined histologically. The histological evaluation indicated that the histological lesions were more severe in gills. © 2019 Bulgarian Academy of Sciences. All rights reserved.
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    First Report of Enteromyxum leei (Myxozoa) in the Black Sea in a Potential Reservoir Host Chromis chromis
    (Fish Pathology, 2014) Özer, Ahmet; Öztürk, Türkay; Özkan, Hakan; Çam, Arzu
    Damselfish Chromis chromis collected from the Black Sea coasts of Sinop, Turkey, were examined for myxosporeans in June and July 2013. One of 25 healthy fish and 2 dead fish had infections with Enteromyxum leei. Developing plasmodia and fully developed spores were numerously observed in the intestine and gall bladder of infected fish. This finding suggests that E. leei can develop normally in this fish species. Absence of fish farms close to the sampling site suggests that the parasite was not originated from farmed fish. This is the first report of E. leei in the Black Sea.
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    First Report of Mazocraes alosae (Herman, 1782), Pronoprymna ventricosa (Rudolphi, 1891) and Lecithaster confusus Odhner, 1905 in pontic shad Alosa immaculata Bennet, 1835 in Turkish coasts of the Black Sea
    (Lucrari Stiintifice-Seria Zootehnie, 2013) Özer, Ahmet; Öztürk, Türkay; Korniychuk, Julia
    In the present study, a total of 31 specimens of pontic shad, Alosa immaculata Bennet, 1835 (Pisces: Clupaeidae) caught in the Black Sea coasts near Sinop, Turkey in 2010 were investigated for their parasite fauna. Four parasite species were identified: Mazocraes alosae (Herman, 1782), Pronoprymna ventricosa (Rudolphi, 1891), Lecithaster confusus Odhner, 1905 and Hysterothylacium aduncum (Rudolphi, 1802). H. aduncum was the core species with infection prevalence of 96.7% and mean intensity value of 97.1 ± 18.1 parasites per infected fish, followed by M. alosae (61.3% and 3.2 ± 0.5), P. ventricosa (35.5% and ± 12.5) and L. confusus (29% and 8.2 ± 2.8), respectively. In the present study, Mazocraes alosae, Pronoprymna ventricosa and Lecithaster confusus are reported from pontic shad off Turkish coasts of the Black Sea for the first time.
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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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    First report of some parasites from Mediterranean mussel, Mytilus galloprovincialis Lamarck, 1819, collected from the Black Sea coast at Sinop
    (Turkish Journal of Zoology, 2014) Özer, Ahmet; Güneydağ, Sevilay
    This is the first study on parasite fauna of Mytilus galloprovincialis Lamarck, 1819 in Turkish waters. Mussel samples were collected monthly at 3 sampling stations on the coast of Sinop on the Black Sea in the period between August 2012 and July 2013. A total of 1740 mussels were examined for parasites using standard parasitological investigation procedures. The parasites identified included the following: 2 protozoans, Nematopsis legeri (32.12%) and Peniculistoma mytili (6.72%); 1 turbellarian, Urastoma cyprinae (6.32%); 1 trematode, Parvatrema duboisi (4.54%); and 1 polychaeta, Polydora ciliata (2.24%). All identified species are illustrated in figures and constitute new records of Turkish parasite fauna.
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    Ichthyophthirius multifiliis üzerine bazı terapötiklerin İn vitro etkisi
    (2010) Öztürk, Türkay; Özer, Ahmet; Ünsal, Gökçe
    Beyaz benek, yetiştiriciliği yapılan tatlısu balıklarında ciddi ekonomik kayıplara neden olan önemli bir paraziter hastalık olup, etken ektoparazitik bir siliat olan Ichthyophthirius multifiliis’tir. Bu çalışmada farklı evrelerdeki I. multifiliis üzerine (theront, tomont ve kist) et-kili terapötikleri belirlemek için, akriflavin nötral, metranidazol, metilen mavisi, potasyum permanganat, sodyum klorür, kloramin-T, kloramfenikol, oksitetrasiklin, tribrisen ve furazolidon in vitro olarak araştırıldı. Farklı evrelerdeki parazit bireylerinin yaşama oranı üze-rine uygulanan kimyasal maddelerin etkinlik dereceleri 0 (%100 etkili); (%75 etkili); (%30-40 etkili); (etkisiz) şeklindeki bir skala yardımıyla değerlendirildi. Sodyum klorür (%3, %2, %1), metranidazol (‰1), metilen mavisi (‰1) ve potasyum permanat (‰1) parazitin bütün evreleri üzerinde etkiliyken, oksitetrasiklin (‰1), furazolidon (‰1) ve tribrisen (‰1) etkili değildi. Akriflavin nötral, kloramin-T ve kloramfenikol’ün ise, theront ve tomont evre-sindeki parazitin bireyleri üzerine etkili fakat kist evresindeki bireyler üzerine etkisiz oldukları belirlendi.
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    Influence of the seasonal and host related factors on the metazoan parasites of Chelon saliens (Mugilidae) in the Turkish coast of the Black Sea
    (Polish Parasitological Society, 2022) Özer, Ahmet; Acar, Gökçe
    The leaping mullet Chelon saliens is one of the economically significant fish species and the revealing its parasite fauna in relation with some ecological and host related factors will provide new data for our current knowledge. A total of 165 leaping mullet were collected from Sinop coasts of the Black Sea in the period from September 2015 to August 2016 and investigated for parasites. Eleven parasite species including Myxobolus parvus, Myxobolus sp., Sphaerospora mugilis (Myxozoa), Ligophorus szidati, Solostamenides mugilis (Monogenea), Schikhobalotrema sparisomae, Saccocoelium tensum, Saccocoelium obesum (Digenea), Hysterothylacium aduncum (Nematoda), Neoechinorhynchus sp. (Acanthocephala) and Ergasilus lizae (Copepoda) have been identified. The overall infection prevalence, mean intensity and mean abundance values were 65.5%, 26.2 and 17.2, respectively. The overall infection prevalence was dominated by L. szidati, followed by M. parvus and Digenea-group. On the other hand, the overall mean intensity values were dominated by Digenea-group, followed by L. szidati and E. lizae, respectively, while the mean abundance values were dominated by L. szidati, followed by Digenea-group and E. lizae. The infection indices of all identified parasites were also calculated in relation with length classes and sex of fish as well as season and the differences were evaluated statistically. Seasonally significant differences in the infection prevalence and mean abundance were found for Digenea-group, Ligophorus szidati and Neoechinorhynchus sp. These differences were also significant in the length classes of Digenea-group and Ligophorus szidati. This study is the first investigation on seasonal and host related dynamics of parasites of C. saliens in the southern coasts of the Black Sea and all investigated factors were found to influence the infection indices of dominating parasite species. © 2022 Polish Parasitological Society.
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    Japon Balığında (Carassius auratus) ichthyophonus hoferi enfeksiyonu
    (2010) Öztürk, Türkay; Özer, Ahmet; Taşkaya, Gökay; Öz, Meryem; Aral, Orhan
    Bu araştırmada, japon balığının (Carassius auratus L., 1758) bazı iç organlarında tespit edilen Ichthyophonus hoferi enfeksiyonu incelenmiştir. Patojen, sporadik ölümlerin görüldüğü özel bir akvaryumda ölümlerin nedenini araştırmak amacıyla incelenen C. auratus balığında tespit edilmiştir. Kalp, karaciğer, dalak ve böbreklerden hazırlanan ezme preparatlarda etrafı kalın fibröz bir zarla çevrelenmiş, ortalama 200-250 ?m çapında, küre şekilli ve çok çekirdekli bir morfolojik özellik gösteren etken Ichthyophonus hoferi olarak tanımlanmıştır. Ichthyophonus hoferi patojenine karşı konak reaksiyonu olarak belirlenen granulom gelişim aşamaları detaylı olarak verilmiştir.
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    Karadeniz'in Sinop kıyılarından yakalanan bazı deniz balıklarının metazoan parazitleri
    (2013) Özer, Ahmet; Olguner, Ahmet Murat
    Ekim 2006- Eylül 2007 tarihleri arasında yürütülen bu çalışmada, Karadenizin Sinop kıyılarından yakalanan mezgit (Merlangius merlangus Nordmann, 1840), tirsi (Alosa immaculata Bennett, 1835), kalkan (Psetta maxima L., 1758) ve izmarit (Spicara smaris L., 1758) balıkları metazoan parazitler yönünden incelenmiştir. Araştırma sonunda, mezgit, tirsi ve izmarit balıklarında Hysterothylacium aduncum (Rudolphi, 1802), kalkan balığında Bothriocephalus scorpii (Müller, 1776) ve tirsi balığında Livoneca punctata (Uljanin, 1872) türlerinin varlığı belirlenmiştir. Bu türlere ait enfestasyon/enfeksiyon oranları (%) ve enfeste/enfekte balık başına ortalama sayılarının konakçı balık türlerine göre dağılımları da hesaplanmış ve tartışılmıştır.
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    Lactococcosis in rainbow trout (Oncorhynchus mykiss, Walbaum, 1792) in themiddle Black Sea Region in Turkey and antimicrobial susceptibility of theaetiological agent, Lactococcus garvieae
    (Etlik Veterinerlik ve Mikrobiyoloji Dergisi, 2013) Öztürk, Türkay; Didinen, Behire Işıl; Doğan, Gaye; Özer, Ahmet; Bircan, Recep
    "In this research study, we isolated Lactococcus garvieae from rainbow trout in the middle Black Sea region in Turkey. The diseases outbreak occurred at average water temperature of 16.7°C during April-May 2009. Clinically stagnation, inapetence, darkening of the skin, exophtalmia, opacification in the cornea, hemorrhages in the eyes and at the base of pectoral and anal fins, swollen abdomen and wounds on the body surface were observed in infected fish. In necropsy; the existence of accumulation of bloody fluid in the body cavity, ascites in the intestines and the stomach characterized with a yellowish-colored liquid, enlarged and darkening in the spleen and kidney, fading in colour, existence of petechial hemorrhages and enlarged in the liver were detected. In order to isolate the aetiological agent, 20 infected rainbow trout weighting between 50-100 gr were used. As the result of conventional tests used in the identification of the bacteria, the aetiological agent was identified as L.garvieae. The isolated L.gavieae strain was determined as susceptible to amoxicillin, amoxicillin/clavulanic acid, cephalothin, chloramphenicol, doxycycline, enroflaxacin, pristinamycine and tetracycline."
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    Lactococcosis in rainbow trout (Oncorhynchus mykiss,Walbaum, 1792) in the middle Black Sea Region in Turkey and antimicrobial susceptibility of the aetiological agent, Lactococcus garvieae
    (2013) Öztürk, Türkay; Didinen, Behire Işil; Doğan, Gaye; Özer, Ahmet; Bircan, Recep
    Bu çalışmada, Türkiyenin Karadeniz Bölgesindeki gökkuşağı alabalıklarından Lactococcus garvieae izole edildi. Hastalık salgını ortalama 16.7C su sıcaklığında Nisan-Mayıs 2009 aylarında görüldü. Hasta gökkuşağı alabalıklarında klinik olarak durgunluk, iştahsızlık, renkte koyulaşma, tek ya da çift taraflı eksoftalmus, korneada opaklaşma, gözlerde, pektoral ve anal yüzgeç tabanlarında hemoraji, karında şişkinlik, vücut yüzeyinde yaralar görüldü. Nekropside vücut boşluğunda kanlı-renkli bir sıvının varlığı, barsak ve midede sarı berrak renkte sıvı ile karakterize asites, dalak ve böbrekte büyüme, renklerinde koyulaşma, karaciğerde büyüme, renginde açılma ve peteşiyel kanamaların olduğu tespit edildi. Hastalık etkenini izole etmek için yaklaşık 50-100 g ağırlığında hasta 20 adet gökkuşağı alabalığı bakteriyolojik incelemelerde kullanıldı. Bakterilerin identifikasyonunda konvansiyonel testler kullanıldı ve hastalık etkeni L.garvieae olarak tanımlandı. İzole edilen L.garvieae suşu, amoxicillin, amoxicillin/clavulanic acid, cephalothin, chloramphenicol, doxycycline, enroflaxacin, pristinamycine ve tetracycline duyarlı olduğu tespit edildi.
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    Monogenean Fish Parasites, Their Host Preferences and Seasonal Distributions in the Lower Kızılırmak Delta (Turkey)
    (Turkish Journal of Fisheries and Aquatic Sciences, 2014) Öztürk, Türkay; Özer, Ahmet
    Bu kapsamlı araştırma, Türkiye’nin kuzeyinde Karadeniz kıyısında bulunan Aşağı Kızılırmak Deltasındaki Cyprinidae, Mugilidae, Gobiidae, Percidae, Cyprinodontidae, Gasterosteidae, Cobitidae, Atherinidae, Poecilidae ve Syngnathidae familyalarına ait 16 balık türünün monogenea faunasını belirlemek amacıyla yapıldı. Toplam 1049 adet balık bireyi Aralık 2010 ve Kasım 2011 tarihleri arasında yakalandı. Gyrodactylus proterorhini, G. cyprini, G. arcuatus, Dactylogyrus extensus, D. chalcalburni, D. difformis, Ancyrocephalus paradoxus, Ligophorus mediterraneus, L. cephali, Solostamenides mugilis, Paradiplozoan homoion tür bazında tanımlanırken, bir Gyrodactylus ve bir Salsuginus ise cins bazında tanımlandı. Bazı monogenea türlerinin, özellikle Ligophorus türlerinin Mugillidae ve Dactylogyrus türlerinin Cyprinidae aileleri için spesifik olduğu belirlendi. İncelenen balıklarda tespit edilen her bir monogenean tür ve/veya cins için enfestasyon oranları (%) ve enfestasyon parametreleri hesaplandı ve ilgili konak türlerindeki bulunuşları tartışıldı. Bu araştırmada tanımlanan tüm monogenea türleri Aşağı Kızılırmak Deltası için ilk bildirimlerdir. Gyrodactylus cyprini ve Ancyrocephalus paradoxus ise Türkiye parazit faunası için yenidir.
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    Prevalence and Intensity of Gyrodactylus arcuatus Bychowsky, 1933 (Monogenea) Infestations on the Three-Spined Stickleback, Gasterosteus aculeatus L., 1758.
    (Turkish Journal of Veterinary and Animal Sciences, 2004) Özer, Ahmet; Öztürk, Türkay; Öztürk, M. Oğuz
    Gyrodactylus arcuatus Bychowsky, 1933 was identified on the three-spined stickleback, Gasterosteus aculeatus L., 1758 in the present study, which was carried out between January and May 2000. A total of 151 fish specimens were examined. The infestation prevalence and mean intensity levels were 80.2% and 35.44 ± 8.87 parasites per fish, respectively. The infestation prevalence and mean intensity levels were highest in February and May, respectively. No statistically significant preference fo r either sex of fish was determined. The mean intensity of G. arcuatus was highest on the gills, followed by the fins and skin. Significant differences were observed in the distribution of G. arcuatus over the body parts studied with respect to the length classes of fish.