Dr. Murai Éva - Gubányi András szerk.: Parasitologia Hungarica 28. (Budapest, 1995)
Mollusca Bivalvia UNIONIDAE Anodonta sp. (1.) —Stizostedion lucioperca, Stizostedion volgense, Pelecus cultratus Arthropoda Crustacea ERGASILIDAE Ergasilus sieboldi Nordmann, 1832 — Stizostedion lucioperca, Stizostedion volgense, Abramis brama, Carassius auratus gibelio, Silurus glanis, Pelecus cultratus, Cyprinus carpio, Ctenopharyngodon idella, Tinea tinea Ergasilus gibbus Nordmann, 1832 — Anguilla anguilla LERN AEOPODI DAE Achtheres percarum Nordmann, 1832 — Stizostedion lucioperca, Stizostedion volgense Tracheliastes maculatus Kollar, 1836 — Abramis brama ARGULIDAE Argulus foliaceus (Linnaeus, 1758) —Stizostedion lucioperca, Tinea tinea In the pike-perch (Table 1), a gut-parasitic trematode, Rhipidocotyle illense proved to be the commonest parasite: its metacercariae were also found on pike-perch. (Members of the genera Rhipidocotyle and Bucephalus differ only in the fimbria located at the cephalic end. At the same time, the cephalic fimbria of B. polymorphus are often drawn in; therefore, the data presented in the table not necessarily reflect the real incidence ratio of the two species). The nematode Camallanus truncatus, found in the gut and in the pyloric appendices, also proved to be a common pike-perch parasite. Of the protozoan parasites, Trichodina spp. identified only to genera found on the gills occur much more frequently than suggested by the data shown in the table; namely, these ectoparasites disappear soon after placing the fish into an aquarium. The cysts of Henneguya creplini could be detected on the gills in practically all seasons; however, spores developed in them only in the early spring period. The renal tubules of pike-perch dissected in the spawning period often contained spores of Sphaerospora danubialis. Of the pathogenic parasite species, mention should be made of the "teracotyle" metacercariae of the Ichthyocotylurus species parasitic in birds. These metacercariae were located in the abdominal organs and the peripharyngeal tissues, but in the majority of cases they also occurred as a mass attached to the pericardium, moving together and identical in size with the heart. The gill-parasitic helminth Ancyrocephalus paradoxus was consistently found to possess demonstrable pathogenicity. Groups of this monogenean colonised the filaments at the convolutions of the gill arch; at these places the filaments broke and came off in fragments. Ergasilus sieboldi infection also gave rise to gill lesions well visible with the unaided eye. That parasite established itself in large masses on the gill filaments and also on the external surface of the operculum.
