Fig 1. Zebrafish mortality is associated with increased TiO₂NP levels in the water.

(A) Experiment outline. (B) TiO₂NP dose–dependent induction of mortality in zebrafish. (C) Increase in water OD after the addition of TiO₂NPs. * P < 0.05, compared with the untreated group; ^† P < 0.05, compared with the 40 mg/L treatment groups (B); * P < 0.05, compared with the untreated groups; ^† P < 0.05, compared with the groups at day 0 (C) n = 16.