VPA2BOX

The Dual Zone VPA Model (VPA-2BOX) is a flexible software tool for analyzing the abundance and mortality of exploited animal populations.

It has the capability of analyzing two different stocks simultaneously, making possible routine quantitative analyses of the effect of sex-specific growth or stock intermixing. In addition, a wide variety of options are provided with respect to the types of data that may be used and the way the parameters are estimated. The flexible interface allows the user to configure and test reduced model parameterizations.

VPA-2BOX allows the user to specify either single or dual zones with independent specification of catch and surveys. The user may also introduce tagging data into the dual zone configuration to account for mixing of the two populations. Users may specify parameters to be linked and introduce priors.