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Mortality due to heavy infestation of Argulus foliaceus (Linnaeus, 1758) (Branchiura) in pond-reared carp, Cyprinus carpio L., 1758 (Pisces)

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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. Une 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.

Affiliations: 1: Department of Aquatic Animal Diseases, Faculty of Veterinary Medicine, Ondokuz Mayis University, TR 55139 Samsun, Turkey; 2: Department of Parasitology, Faculty of Veterinary Medicine, Ondokuz Mayis University, TR 55139 Samsun, Turkey


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