Virtual population analysis modified as a result of an approximation to the catch equation that allows a simple numerical implementation
Keywords:Virtual Population Analysis, mortality rates, stock assessment
A modification to the Virtual Population Analysis as a result of an approximation to the catch equation that allows to avoid solving nonlinear equations in each cohort reconstruction process is presented. The relative errors obtained when estimating the fishing instantaneous mortality rate per age (maximum and mean in absolute value) remained lower than 1.4% within the M and F range values (natural instantaneous mortality rate and fishing instantaneous mortality rate) considered (0 £ M £ 1.2 and 0 £ F £ 2). The new method can be adapted to a particular situation (M and F range values) by simply solving an optimization problem (minimization of the maximum relative error absolute value) easily achieved using a calculation sheet or considering the approximation corresponding to any of the domains hereby analyzed.
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Copyright (c) 2017 Daniel Hernández, Manuela Mendiolar
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