Estimates of vBGF parameters did not differ significantly between periods, that is, the model allowing all vBGF parameters to differ between periods was not a significantly better fit than a model with the same parameter values for all otoliths (df = 6, difference in log likelihood = -0.61, χ2 = 1.23, p = 0.98). L∞ estimates for the three periods varied between 2.203 and 2.441, estimates of K varied between 0.204 and 0.248 and estimates of t0 varied between -0.018 and 0.124 (Table 3). Any comparison of these parameter values should acknowledge the shrinkage of archeological otoliths .