PATHOLOGICAL CHANGES IN EUSTROGYLIDOSE OF COMMON CARP (Cyprinus carpio) IN THE CONDITIONS OF SOUTHERN UKRAINE

Abstract

Pathological examination of common carp (Cyprinus carpio) infected with Eustrongylides nematode larvae was carried out. The general exhaustion of the fish and a large amount of mucus in their scales, an increase in the volume of the abdominal cavity were observed. It was found that the larvae are not encapsulated, freely located on the surface of the organs: liver, kidneys, walls of the digestive tube. It was found that most of the larvae were twisted into a semi-ring, surrounded by a mucous-like gray-yellow mass; when the larvae were removed, necrotization with violation of the integrity of the capsule and subcapsular zone of the organ, hyperemia and hemorrhage were observed at the site of their localization. In 30 % of carps, signs of purulent, fibrinous-purulent peritonitis were found. Common pathological changes include metabolic disorders with changes in the color and consistency of parenchymal organs. In case of perforation of the intestinal wall by the pathogen, edema, hyperemia and hemorrhage around the area with mechanical damage were recorded. In the lumen of the stomach and intestines, the larvae were found in a twisted state, surrounded by a translucent shell covered with a layer of mucus on top, the mucous membrane was in a state of acute catarrhal inflammation. Edema and tissue hemorrhage were recorded on the serous membrane of the abdominal wall, mesentery, and in the thickness of both intercostal and abdominal wall muscles in the areas of pathogen localization.