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Abnormal swimming and major mortalities of fish were observed by a fish farmer in his pond in which he was rearing common carp (Cyprinus carpio) in Samsun, Turkey. A total of 118 common carps of different size and weight were transferred to the laboratory and examined for ecto-and endoparasites. Thus, a heavy infestation with the fish louse, Argulus foliaceus, was found, with the ectoparasites firmly attached to the skin and fins of all the (118) carps, during this parasitological examination (100% prevalence). Up to 800-1000 lice were counted on a single fish and most of these were detected as microscopic juvenile stages. Major fish mortalities or large numbers of moribund fishes due to this parasite were seen throughout the pond. Furthermore, no endoparasites were found in the carps examined. In the pathological investigation, hyperaemia, especially on the pectoral and pelvic fin bases and in the abdominal area, was macroscopically observed. RÉSUMÉUne nage anormale et des mortalités importantes chez les poissons ont été observées par un aquaculteur dans son étang dans lequel il élevait la carpe commune (Cyprinus carpio) à Samsun, la Turquie. Un total de 118 carpes communes de différentes tailles et poids ont été transférées au laboratoire et examinées en vue d'y observer d'éventuels ecto-et endoparasites. C'est ainsi qu'au cours de cet examen parasitologique, une forte infestation par Argulus foliaceus a été mise en évidence, les ectoparasites étant fermement fixés sur la peau et les nageoires de toutes les (118) carpes (prévalence de 100%). Jusqu'à 800-1000 parasites ont été comptés sur un seul poisson et la plupart d'entre eux ont été détectés aux stades juvéniles à l'échelle microscopique. Des mortalités considérables de poissons ou bien de grands nombres de poissons moribonds ont été observés dans tout l'étang. En outre, aucun endoparasite n'a été trouvé chez les carpes examinées. Lors de l'examen pathologique, une hyperémie, en particulier à la base des nageoires pectorales et pelviennes a été observée à l'échelle macroscopique.3 )

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A total of 286 larval forms of Hysterothylacium aduncum were collected from Merlangius merlangus euxinus and Trachurus trachurus captured at different sites of the Black Sea coast of Turkey. Prevalence of H. aduncum in M. merlangus euxinus and T. trachurus was 37.4 and 29.3 %, respectively. The fourth-stage larvae from M. merlangus euxinus and T. trachurus of H. aduncum were characterized genetically using a molecular approach. The ribosomal DNA (rDNA) internal transcribed spacer (ITS) region (ITS-1, 5.8S subunit, ITS-2) was amplified and sequenced. Two isolates of H. aduncum obtained from M. merlangus euxinus and T. trachurus in Black Sea showed a 100 % nucleotide similarity. Pairwise comparison between the entire ITS fragment including ITS-1, 5.8S, ITS-2 sequences of the H. adumcum isolates of M. merlangus euxinus and T. trachurus from Black Sea (Turkey, JX413596-JX413597) and other H. adumcum isolates from Baltic Sea (Poland, AJ937672), North Sea (Denmark, HM598666), Mediterranean Sea (Tunisia, HQ270427), Japan Sea (Japan, AB277826), Adriatic Sea (Croatia, JQ934878), East Greenland Sea, English Channel, Bay of Biscay, Adriatic Sea, and North Sea showed differences ranging from 0.1 to 0.7 %. With the present study, larvae of H. aduncum infecting M. merlangus euxinus and T. trachurus caught off the Black Sea, Turkey were characterized for the first time by sequencing of the ITS rDNA.