Populations of <i>Vibrio</i> and <i>Aeromonas</i> exhibit different dynamics within the zebrafish intestine.

<p>(A) An optical section of the intestinal bulb from a larval zebrafish mono-associated with <i>Vibrio</i> (the cyan box in the diagram below outlines the region imaged). The population consists of discrete, highly motile individuals (inset: single <i>Vibrio</i> cells). (B) A montage of images taken from the time-series in <a href="http://www.plosbiology.org/article/info:doi/10.1371/journal.pbio.1002517#pbio.1002517.s009" target="_blank">S3 Movie</a> shows that the highly motile and planktonic <i>Vibrio</i> cells maintain their overall distribution despite repeated intestinal contractions. Time between frames: 1 second. (C) An optical section of the intestinal midgut from a larval zebrafish mono-associated with <i>Aeromonas</i> (the magenta box in the diagram below outlines the region imaged). Cells are largely non-motile and densely aggregated. (D) A montage of images taken from the time-series in <a href="http://www.plosbiology.org/article/info:doi/10.1371/journal.pbio.1002517#pbio.1002517.s013" target="_blank">S7 Movie</a> shows an aggregate of <i>Aeromonas</i> in the midgut that is spatially dynamic, entering and exiting the field of view multiple times. Time between frames: 1 second. (A–D) Scale bars: 50 μm.