Paracoenogonimus ovatus Katsurada, 1914

Kirjušina, Muza, Bricis, Reinis & ne, Inese Gavara, 2022, Metacercariae Of Trematoda In Fish Musculature From Latvian Water Bodies, Acta Biologica Universitatis Daugavpiliensis 22 (2), pp. 189-193 : 190

Paracoenogonimus ovatus Katsurada, 1914

For the first time the parasite has been reported by Shulman in 1949 as syn. Neodiplostomum hughesi (Markevich, 1934) . The dominant muscle parasite in freshwater fish P. ovatus was registered in 17 fish species: bream ( Abramis brama ), white bream ( Blicca bjorkna ), roach ( Rutilus rutilus ), tench ( Tinca tinca ), rudd ( Scardinius erythrophthalmus ), vimba ( Vimba vimba ), bleak ( Alburnus alburnus ), asp ( Aspius aspius ), crucian carp ( Carasius carasius ), gudgeon ( Gobio gobio ), ruffe ( Gymnocephalus cernuus ), chub ( Leuciscus cephalus ), ide ( L. idus ), dace ( L. leuciscus ), zander ( Sander lucioperca ), perch ( Perca fluviatilis ), pike ( Esox lucius ) from lakes and rivers. Prevalence of infection varied between 3.3% and 86.6%. High natural infection parameters in roach (P=86.6%), bream (P=85.5%) and rudd (P=80%) were detected. Highest intensity of infection was 98.3 specimens per 10 grams roach muscles ( Shulman 1949, Kirjusina & Vismanis 2004). In roach and bream form lakes, P. ovatus metacercariae was found not only in musculature but in liver, kidneys, and eyes as well (Kirjusina 2004).

First intermediate hosts of trematode are Viviparus viviparous and V.contectus , gastropod of genus Viviparus ( Viviparidae, Vivipariformes ) ( Komiya 1938, Kozicka & Niewiadomska 1958, Ginicinskaja 1968). Lange reported cercaria stage from V. contectus ( Lange 1968) . Molluscs V. viviparus and V.contectus frequently occurs throughout whole territory of Latvia, mainly in flowing waters, like rivers and lakes (Rudzite et al. 2010). Range of definitive hosts is wide, mainly diurnal piscivorous birds from order Falconiformes and Anseriformes (Mergidae) ( Kozicka & Niewiadomska 1958).