Estimation of fishing mortality rates based on the 4 parameter estimation approaches.

<p>Fishing mortality rates estimated for dusky kob (<i>A</i>. <i>coronus</i>) (a) and leerfish (<i>L</i>.<i>amia</i>) (b) according to different assumptions for global parameter minimization. Results assuming constant selectivity (μ<sub>S</sub> and σ<sub>S</sub> fixed over years) are presented in red (approaches ii and iv), whereas those assuming yearly selectivity parameters are in black (approaches i and iii). Dashed lines represent rates assuming the population is at equilibrium (approaches i and ii), whereas solid lines use the “n-fishing years” hypothesis (approaches iii and iv).</p>