<prompt> Fish in stream appearance is seen in?Hemophilus ducreyiProteusMycoplasmaV. Cholerae  <response>: Ref: Ananthnarayan and Panikers Textbook of Microbiology, 8th ed. pg. 302 In stained films of mucus flakes from acute cholera cases, the vibrios are seen arranged in parallel rows, described by Koch as the fish in stream appearance. School of Fish appearance is seen in H. ducreyi. Vibrios are Gram-negative, rigid, curved rods that are actively motile by means of a polar flagellum. The name vibrio is derived from the characteristic vibratory motilitydarting motility The cholera vibrio is a short, curved, cylindrical rod, about 1.5x0.2-0.4mm in size, with rounded or slightly pointed ends. The cell is typically comma shaped. Aside from V. cholera, darting motility is also seen in Campylobacter. 