Figure 7
From: Columnaris disease in fish: a review with emphasis on bacterium-host interactions
Gill of a rainbow trout infested with F. columnare. This scanning electron microscopic (SEM) picture of an affected gill arch reveals the presence of long, thin, rod-shaped bacterial cells, approximately 0.3-0.5 μm wide and 3-10 μm long (SEM, bar = 5 μm).