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Monitorowanie i ocena stanu zdrowia węgorza europejskiego Anguilla anguilla (L.) w Polsce

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Robak S. , Siwicki A. K. , Kazun B. , Kazun K. , Lepa A. , Schulz P. , Kaczorek E. , Szczucinska E. , Terech-Majewska E.

nr 6

The significance of eel to fisheries management and the environment necessitates the continuous monitoring of the health and condition of this valuable species. One of the many monitoring studies realized within the project was to determine the condition and health status of eel used for stocking open waters and those inhabiting various basins in Poland. The newest research and diagnostic methods were used to conduct these targeted studies. The studies were performed by a research team comprised of staff from the Department of Ichthyology at IFI, the Department of Fish Pathology and Immunology at IFI, the Department of Microbiology and Clinical Immunology and the Department of Epizootilogy in the Faculty of Veterinary Medicine at UW-M in Olsztyn, and the Department of Food and Environmental Chemistry at the National Marine Fisheries Research Institute in Gdynia. Full clinical, anatomic pathological, parasitological, mycological, virological, bacteriological, biochemical, and immunological studies were performed. The analysis of the condition and health status of stocking material indicated that eel originating from Polish and foreign hatcheries for stocking open waters did not resent and pathology that would indicate and acute or chronic diseases. Neither the EVEX or the AngHV-1 viruses were isolated from the fish analyzed, nor was the presence of the VHS, IHN, IPN, or SVC viruses confirmed. The analysis of the condition and health of eel inhabiting open waters indicated that approximately 20% of the fish from each basin exhibited abrasions, discoloration, small skin lesions, and bruising on the caudal and pelvic fins. Only in single specimens from some basins was pathology indicative of disease confirmed. The bacteria Aeromonas hydrophila, A. sobria and Flavobacterium psychrophilum were isolated from them. Targeted virological studies of one eel specimens from the Szczecin Lagoon confirmed the occurrence of the AngHV-1 virus. An important element of the research was that among the fish monitored from various basins a systematic increase in the prevalence of the nematode Anguillicoloides crassus was noted at an intensity and extensiveness of invasion that ranged from 50 to 100% of the studied fish population