Fig 2. Analysis of zebrafish motility in water containing TiO₂NPs.

(A) Experiment outline and settings. (B, C) Sequential images of zebrafish in tanks with water containing TiO₂NPs. (D) 2D plots of zebrafish spot swimming speed versus average swimming speed at day 0 (untreated) and (E) day 6 (with or without TiO₂NPs); dashed lines represent the average spot speed and average swimming speed of the groups at day 0. (F) Statistical analysis of zebrafish swimming speed and (G) body weight under various conditions. * P < 0.05, compared with the untreated groups at day 6. n = 7.