Invasive diseases of commercial fish species in the Volga River Delta
In the article, the data on the Volga fishes morbidity, including cestodosis, nematodosis, and crustaceosis are presented. The pathological changes in fish organisms when invaded by Caryophyllaeus laticeps, Triaenophorus nodulosus, Proteocephalus osculatus, Raphidascaris acus, Eustrongylides excisus, Achtheres percarum are shown. The revealed clinical appearances are seasonal and registered almost annually.