Characteristics of the five potential cohort structures for eastern oyster examined with the R package mixtools.

There were four year classes with either one or two cohorts, except in 2003 when spatfall and oyster abundance were too low to distinguish more than one cohort. Nominal = starting values entered into mixtools for mean size of each cohort; μ, σ and proportion = estimates of cohort mean size, standard deviation, and proportion of the population in each cohort generated by mixtools.