Dr. Murai Éva - Gubányi András szerk.: Parasitologia Hungarica 29-30. (Budapest, 1997)
Mollusca Bivalvia UNIONIDAE Anodonta sp. (I.) — Scardinius erythrophthalmus, Perca fluviatilis Arthropoda Crustacea ERGASILIDAE Ergasilus sieboldi Nordmann, 1832 — Esox lucius ARGULIDAE Argulus foliaceus (Linnaeus, 1758) — Abramis brama, Alburnus alburnus, Cyprinus carpio, Scardinius erythrophthalmus, Stizostedion lucioperca, Tinea tinea Only large, several years old specimens of the gibel carp (Carassius auratus gibelio) could be examined and were found to have low-level parasitic infection. A total of 3 metazoan and 5 protozoan species were recorded. Of the metazoan parasites, the monogenean Dactylogyrus species were detected only in samples taken in the spring, while Philometroides sanguinea, a nematode whose adult forms parasitise the fin rays, occurred only in samples taken in the autumn. The metacercariae of Diplostomum spathaceum could be found in the eye lens throughout the year and caused an infection of low prevalence and intensity. The protozoan parasites Hoferellus carassii and Goussia carpelli proved to be very common at all sampling times, but caused more intensive infection in fish examined in the autumn than in those dissected in the spring. In the bream (Abramis brama) 4 protozoan and 5 metazoan parasite species were detected. Protozoans, which caused infections of low prevalence and intensity, were represented by Ichthyophthirius multifiliis, Trypanosoma danilewskyi, Goussia pannonica, and Myxobolus bramae. Monogeneans (Dactylogyrus spp. and Diplozoon paradoxum) proved to be the commonest metazoan parasites, while carp lice (Argulus foliaceus) and glochidia (Anodonta sp.) were found on a few fish only. All breams in the catch were of large size and extremely good body condition. We could not catch small-sized breams at the samplings performed. All specimens of common carp (Cyprinus carpio morpha hungaricus) in the catch were wild carp of large body size, having a body length of 42 to 70 cm. As with the bream, no small-sized wild carp could be caught. The common carp was also characterised by a parasite fauna consisting of a few species only: a total of 5 protozoan and 7 metazoan species were recorded. The protozoans Trypanosoma danilewsky, Ichthyophthirius multißliis, Goussia carpelli, Myxobolus cyprini, and Myxobolus dispar caused infections of low prevalence and intensity. The most prevalent metazoan was the eye lens parasite Diplostomum spathaceum, while the most intensive infection was caused by the nematode Skrjabillanus sp. which, however, was detected from the skin of a few common carp only. In addition to the above species, the monogeneans Dactylogyrus extensus and Eudiplozoon nipponicum, a Gyrodactylus species parasitising the epithelium, and carp lice (Argulus foliaceus) were recorded on the fish examined. Of the other cyprinid fishes, the rudd (Scardinius erythrophthalmus) was examined in the highest numbers and was found to have 7 protozoan and 9 metazoan parasites. In the
