INFECTION OF THE EUROPEAN VENDACE (COREGONUS ALBULA, LINNAEUS, 1758) FROM LAKE ONDOZERO BY PLEROCERCOIDS OF CESTODES DIPHYLLOBOTHRIUM DITREMUM (CREPLIN, 1825) DEPENDING ON THE FISH GENDER

This article presents research data on the infection of the European vendace from Lake Ondozero with plerocercoids of the cestode Diphyllobothrium ditremum (Creplin, 1825) depending on the fish gender. The material was collected and processed by the common partial parasitological dissection technique. The research was performed in the Laboratory of Biology and Biological Basis of Preventive Measures of the VNIIP – FSC VIEV from November 2024 to January 2025. The fish samples for the research were collected from commercial catches made by the Veterinary Service of the Northern Sea Department of the Federal Service for Veterinary and Phytosanitary Surveillance (Rosselkhoznadzor) under the State Epizootological Monitoring Plan for aquatic biological resources for 2024. The study was performed on 30 fish specimens (14 males and 16 females) of the European vendace (Coregonus albula, Linnaeus, 1758) from Lake Ondozero (Segezhsky and Muezersky Districts of the Republic of Karelia). The Lake is part of the Nizhniy Vyg River Basin, which enters the White Sea. Encapsulated plerocercoids of the cestode Diphyllobothrium ditremum (Creplin, 1825) was found in the stomach walls and intestines of the study fish samples. The intensity of infection of the European vendace with Diphyllobothrium ditremum (Creplin, 1825) plerocercoids was studied depending on the fish gender.