Fig. 5

Effect of LcAiiK on the swimming motility, virulence factor production, and biofilm formation in A. hydrophila AH-1 and AH-4. a The swimming motility of A. hydrophila AH-1 and AH-4. b The haemolytic activity of A. hydrophila AH-1 and AH-4. c The extracellular proteolytic activity of A. hydrophila AH-1. d The extracellular proteolytic activity of A. hydrophila AH-4. e Biofilm formation (column chart) was detected by crystal violet staining, and planktonic cells (red line chart) were detected by plate counting of A. hydrophila AH-1. f Biofilm formation (column chart) was detected by crystal violet staining, and planktonic cells (red line chart) were detected by plate counting of A. hydrophila AH-4. Data are shown as mean ± SD, n = 3. A t test was performed for testing differences between groups, and the ** and * indicate P < 0.01 and P < 0.05, respectively