INFESTATION OF THE Carassius auratus auratus (variety vailtail goldfish) BY THE COPEPOD Lernaea cyprinacea(CRUSTACEA)

The copepod Lernaea cyprinacea Linnaeus, 1758 is known by the large spectrum of fish hosts which it infests, and to which it can cause haemorrhages and ulcerations. The paper focuses on parasitisation degree of parasitic copepodului on a fish in captivity. The field trips organized within Preajba, Romania hydrographical basin in July 2010 allowed us to collect ichthyologic material, namely crucian carp Carassius gibelio Bloch, 1782, which was introduced into an artificial basin with a total capacity of 60 l, together with three specimen of Carassius auratus auratus (variety vailtail goldfish). The parasitosis appeared at goldfish shortly after the introduction of the sampled specimens of Carassius gibelio and water in the artificial basin. The identification of the ecotoparasite was achieved on the base of the general methods of ichthyoparasitological diagnosis, macroscopically by means of clinical examination and microscopically by means of tegumentary curettage from the tegument and fins, as well as through successive washing of the gills and tegument and visualisation at the optic microscope and stereomicroscope in the parasitology laboratory of Dolj Sanitary Veterinary Directorate. After the examination of the tegument and gills, there were sampled the parasites with a clip and dissociation needles. The crustaceans were placed on a mount in a drop of water and then examined at a stereomicroscopic and optic microscope; at the same time, there were taken pictures. The description of the disease makes reference to its etiology and pathology, as well as to the prophylaxis and treatment measures stipulated in the literature in the field .