Cystidicola farionis Fischer, 1798

Kirjusina, Muza, Paidere, Jana, Rubenina, Ilze, Kecko, Sanita, Bricis, Reinis, Mežaraupe, Ligita & Gavarane, Inese, 2023, Common Freshwater Fish Nematodes In Latvia, Acta Biologica Universitatis Daugavpiliensis 23 (2), pp. 189-206 : 198

Cystidicola farionis Fischer, 1798 (F)

For the first time in Latvia, this freshwater water nematode has been reported by K. Shulman (1949) as syn. Cystidicola impar (Schneider, 1866) in the swimbladder of Coregonus lavaretus and Osmerus eperlanus from mouth of the Daugava River. Later parasite was detected in Gadus morhua callarias , Lampetra fluviatilis , Oncorhynchus mykiss ( Kirjusina & Vismanis 2007) . Studies in 1949 revealed 26.6% of infected smelt, but by 2004 all fish studied were infected ( Kirjusina and Vismanis 2004). The amphipod crustaceans Pontoporeia affinis , Gammarus fasciatus , G. pseudolimnaeus , Hyalella azteca and the mysid crustaceans Mysis relicta act as intermediate host ( Smith & Lankester 1979, Moravec 1994). The definitive hosts of nematodes belong to open-bladder fish of the families Salmonidae and Osmeridae in which this parasite inhabits their lives ( Black & Lankester 1980, Moravec 1994). High intensity of the invasion causes anemia and inflammation of the swim bladder and disturbs its functions, moreover, C. farionis is a vector of bacterial diseases ( Cusack & Cone 1986, Willers et al. 1991).