Fig. 5

Developmental delay and developmental failure rates observed in the fish embryo test. Zebrafish embryos exposed to water and sediment samples from the Argen River from sampling event 1 (a), sampling event 4 (b), and sampling event 5 (c). Significant differences (*p < 0.05) are indicated with asterisks. The combined data of three test runs were assessed by the Fisher’s exact test. To correct for multiple testing, the Holm–Bonferroni method was applied