Development of smelt eggs incubated at ∼12°C over a period of 10 days (A). Hatch started at 10 days post fertilisation (dpf) and peaked at 12 dpf. Panel B shows the proportion of living eggs during the incubation between 1 and 8 dpf. From the model's posterior distributions, the medians are shown as the black (control, n = 4) and orange (modified jars, n = 3) regression line and the shaded areas show the 0.5 and 0.8 quantile-based credible intervals. Panel C shows the relative hatching success in control (black, n = 4) and modified jars (orange, n = 3). From the model's posterior distributions, the medians are shown as the regression line and the shaded areas show the 0.5 and 0.8 quantile-based credible intervals.