Proliferative Kidney Disease and Viral Pathogens in Wild Brown Trout (Salmo trutta) Populations in the Czech Republic.

The highest percentage of kidney pathology in PCR‐positive fish was detected in the 0+ fish age class (85%), this category shows a highly significant difference compared with age categories 1+, 2+ and 3+ ( p < 0.0001), whereas no significant differences were detected among the remaining groups (Table 1 ).

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