Relationship of body mass and individual egg weight of female smelt (n = 23) used in the trial (A). From the model’s posterior distribution, the median, combined for both treatments, is shown as the black regression line and the blue areas show the 0.5 and 0.8 quantile-based credible intervals. The model explained 33 [4, 53]% of the observed variability (Bayesian R² , median and 95% lower and upper quantile intervals reported). Panel B shows the number of stripspawned female smelt, egg mass and the correspondent number of eggs per jar.