Bacteria from a stagnant pond, including Vibrio sp. bacteria. Vibrio is a genus of Gram-negative curved rod-shaped bacteria, several species of which can cause food-borne infection, including V. cholera, which causes cholera. Vibrio bacteria are motile, and have polar flagella with sheaths. Recorded with Nomarski Differential Interference Contrast illumination. See K002 5930 for this clip without the scale bar.