Figure 4: Biofilm formation of the Pseudoalteromonas sp. strain on a ceramic tile. Ceramics were photographed immediately after the incubation period needed for biofilm formation [20], prior to starting the competition experiment with V. anguillarum. The orange-coloured biofilm (b1) is typical for strain MLms_gA3. In parallel SEM analysis revealed the presence of rod-shaped bacteria. The caves of the tiles are filled cells displaying a length of ~2 μm and a width of ~1 μm (corresponding to the known size of Pseudoalteromonas with 1 μm × 2-3 μm, [21]). A blank ceramic tile incubated in MB-starch served as a control ((a1) and (a2)).