Observed and simulated size distributions of stoplight parrotfish. Observed values (top panel) are for unfished populations in Bonaire and show the mean and 95% confidence interval (CI) from observations over 5 years. Simulated distributions (remaining panels) are generated by an agent-based model for simulated unfished populations with different sex-change rules. Values for each sex-change rule are the mean and 95% CI from the final 20 runs. DOI: https://doi.org/10.1525/elementa.318.f2