Fig. 5
![Fig. 5](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12302-017-0108-y/MediaObjects/12302_2017_108_Fig5_HTML.gif)
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