Fish Population Dynamic and Stock Assessment (2+1)

Introduction

After calculating yield / recruit and yield per recruit in numbers from the above problem (Beverton and yield per recruit model) for various values of F and knowing the optimum age of exploitation (age at first capture T_rfor a set of values, yield per recruit curves with different ages of first capture could be generated.

The F and T_r can be plotted on the X and Y axis, respectively and yield isopleths diagram could be obtained. From yield isopleths, annual yield in weight / recruit as a function of F and T_r could be generated.