Occurrence of skrjabillanid nematodes in fishes of Hungary and in the intermediate host, Argulus foliaceus L.

Histozoic and coelozoic skrjabillanid-type nematodes belonging to the genera Skrjabillanus, Molnaria, Sinoichthyonema, Esocinema, Daniconema and Lucionema are recorded from the subcutaneous tissues, fins, swimbladder and abdominal cavity of different fish species living in natural waters and fish farms of Hungary. In addition to the nine taxonomically identified parasite species, one Skrjabillanus sp., two Molnaria spp. and three Esocinema spp. were identified to the genus level only. The histozoic larval stages of a Molnaria, Daniconema and Lucionema species each, living in a site different from that of the imagoes, were also detected. The presence of closely not identified first- to third-stage skrjabillanid larvae was demonstrated in 26.3% of the parasitic carp lice (Argulus foliaceus L.) collected from the eight fish species.