Fig. 4. Average percentage hatched eggs in the treatment groups of the crude oil experiment (A; n = 5) and the pyrene experiment (B; n = 3), respectively. Different lower
case characters indicate treatment groups that are significantly different within each experiment (p < 0.05). C: control, SC: solvent control, P1–P5: pyrene treatments (see
text for nominal and measured concentrations), L: low crude oil treatment, M: medium crude oil treatment, H: high crude oil treatment.