Fig. 3From: Fish health in the Nidda as an indicator for ecosystem integrity: a case study for Central European small streams in densely populated areasSemi-quantitative assessment of gill histopathology; a O. mykiss (CF monitoring); b S. trutta f. fario (FF monitoring); c L. cephalus (FF monitoring); d B. barbatula (FF monitoring); significant differences between sampling sites are marked with asterisks; gill sections stained with HE; e control; f reaction status; g destructionBack to article page