Least squares fit of the power model (2) describing the uncertainty in selection parameters versus number of fish length measured.

a and b are the parameters in the model (2) and R2 is the ratio of variation explained by the model. Model fits are given for the different fish size distributions considered for both the Barents Sea bottom trawl fishery targeting cod (left) and the Mediterranean fishery bottom trawl fishery with red mullet as reference species (right). Model parameters are given for both the covered codend and the paired-gear methods.