engleski

Overview of most important diseases affecting rainbow trout culture in Croatia from 2005. to 2010.

Rainbow trout (Oncorhynchus mykiss) is a main salmonid fish species cultivated in Croatia. There are twenty seven freshwater rainbow trout (Oncorhynchus mykiss) farms and two rainbow trout marine cages. Systematic health surveyance in Croatia was performed on the majority of those in the period between 2005 and 2010 and this paper derives its results. Diseases caused by bacteria like rainbow trout fry syndrome (RTFS), yersiniosis, furunculosis, vibriosis, motile Aeromonas septicemia, Pseudomonas infection and bacterial kidney disease were recorded. Infections caused by Flavobacterium psychrophilum, Yersinia ruckeri, A. hydrophila, and A. salmonicida occurred most frequently, but a few outbreaks of Renibacterium salmoninarum were also recorded. Clinical appearance of red mark syndrome associated with Flavobacterium sp. was recorded on two farms recently. Enteric redmouth disease (yersiniosis) was recognized in both growing and adult fish with different clinical appearance. Mainly juvenile rainbow trouts were affected by RTFS and acute form of furunculosis cased by Aeromonas salmonicida subsp. salmonicida. Fifty seven bacterial isolates were phenotypically identified in 249 fish. Most of the bacteria were isolated in spring and summer fewer in fall and winter. Occurrence of parasites was recorded occasionally without serious impact on fish health. Moreover, infection with infectious pancreatic necrosis virus (IPNV) became enzootic in several farms.

rainbow trout; health surveyance; IPNV

nije evidentirano