THE PRESENCE OF THE PARASITE MYXOBOLUS SP. (MYXOZOA: MYXOBOLIDAE) AT THE SPECIES CARASSIUS AURATUS GIBELIO FROM THE SHALLOW RESERVOIRS WITHIN THE LOWER HYDROGRAPHIC BASIN OF THE JIU RIVER (DOLJ ? ROMANIA)

The protozoan Myxobolus sp. belongs to the phylum Myxozoa, a phylum that groups animals characterized by an insufficiently elucidated biological cycle, involving a single host. It parasitizes a wide range of fish hosts, causing them the disease known as myxoboliosis, manifested by difficulty in swimming and slow growth rate. Myxosporidia passes through two stages of development in their biological cycle: vegetative and spore. The spore stage represents both a form of resistance and reproduction. In the fall of 2013, there were performed two sampling sessions in the nine small reservoirs located along the Preajba Valley river. By means of monofilament nets, there were caught 31 specimens of fish belonging to the species: Carassius gibelio, Perca fluviatilis, Abramis brama, Lepomis gibbosus and Alburnus alburnus. They were transported in a plastic container in the laboratory of the Sanitary Veterinary Directorate Dolj. There were prepared and examined native preparations obtained from brachial scrapings and squash preparations obtained by crushing and pulverization of the cartilages of the gill arches, in a short span. Microscopically, the spores are present only in one species, namely Carassius gibelio. In order to establish the etiologic agent and highlight the spores, there were used May Grunwald - Giemsa staining method, as well as malachite green method. The parasitosis evolved subclinically, the parasitized fish not emphasizing obvious evidence of disease.