A fish health survey of selected Austrian rivers: Implications for stocking practices and a wide distribution of Tetracapsuloides bryosalmonae

作者：Lewisch E.^*; El-Matbouli M.

来源：Wiener Tierarztliche Monatsschrift, 2018, 105(3-4): 81-91.

• proliferative kidney disease
• Tetracapsuloides bryosalmonae
• monitoring
• wild fish
• stocked fish
• infectious disease

The aim this study was to assess the health status of fish, especially brown trout (Salmo trutta), in waters where severe decrease of brown trout catches had been observed. Over the course of one year, 116 brown trout, 22 rainbow trout (Oncorhynchus mykiss), eleven European chubs (Squalius cephalus) and several specimens of other fish were sampled. Samples were taken each month and originated from 22 different sites along 15 rivers. All fish underwent necropsy, including parasitological, bacterial, and viral examination. The most relevant finding was a wide distribution of Tetracapsuloides bryosalmonae, the causative agent of proliferative kidney disease (PKD) (12/22 sites) with high prevalence in the affected waters. One rainbow trout was found to be infected with viral hemorrhagic septicemia virus (VHS-V) and several rainbow trout and brown trout were positive, for infectious pancreatic necrosis-virus (IPN-V). Three brown trout were positive for Aeromonas salmonicida achromogenes; the bacterium was cultivated from the head kidney. Infestation with skin and gill parasites was demonstrated in 6.9 % of brown trout and 4.5 % of rainbow trout. There was no obvious tissue damage caused by these ectoparasites. Infestation with acanthocephales led to gastrointestinal lesions and even gut perforation in brown trout, European chub, brook trout (Salvelinus fontinalis) and common barbel (Barbus barbus). In several brown trout, granulomas in the intestinal tract were associated with nematode infection.

• 出版日期2018