Time recovery for exploited fish populations based on surplus yield models

Abstract

A new method to estimate the time recovery of exploited population based on M.B. Schaefer's theory is proposed. The parameters used as follows: current population size (alphaP sub( infinity )'), target population level (BetaP sub( infinity )'), and an estimate of population growth rate. The exploitation and survival rates are described and used to obtain a time-recovery isopleth diagram for a range of population size and exploitation rates. This method is applied to the octopus (Octopus maya) and the red grouper (Epinephelus morio) fisheries on Campeche Bank and to the yellow abalone (Haliotis corrugata) fishery on the central coast of Baja California, in Mexico