Virtual population analysis modified as a result of an approximation to the catch equation that allows a simple numerical implementation

Authors

  • Daniel Hernández Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP)
  • Manuela Mendiolar Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP)

Keywords:

Virtual Population Analysis, mortality rates, stock assessment

Abstract

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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Published

2017-06-12

How to Cite

1.
Hernández D, Mendiolar M. Virtual population analysis modified as a result of an approximation to the catch equation that allows a simple numerical implementation. Mar Fish Sci [Internet]. 2017Jun.12 [cited 2021Sep.17];30:89-103. Available from: https://ojs.inidep.edu.ar/index.php/mafis/article/view/34

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