Class

A simple operating model for modeling recruit-spawners and a terminal marine fishery, no hatchery production.

Details

Various parameters can be stochastic (length nsim) or input as a single numeric (value identical across all simulations).

Slots

Name: Character. Identifying name
nsim: Integer. Number of simulations.
maxage: Integer. The maximum age of the population age structure.
ngen: Integer. The number of generations (life cycles) to run the projection.
kappa: Vector length nsim. The adult productivity ratio for the stock-recruit function. Units of recruits per spawner. Natural per-capita production of recruits as the population approaches zero (density-independent component).
Smax: Vector length nsim. The spawner abundance that maximizes smolt production in the Ricker stock-recruit function. Units of spawners.
sigmaR: Vector length nsim. The lognormal standard deviation in the Ricker stock-recruit relationship. Recruitment anomalies will be simulated with stats::rlnorm().
Recdev: Optional matrix [nsim, ngen] of recruitment anomalies in the Ricker stock-recruit relationship. Overrides the sigmaR argument and provides more user flexibility, for example, simulating with auto-correlation.
type_T: Character. Whether to manage terminal fishery catch from exploitation rate ("u") or catch target ("catch"). Default is "u".
u_terminal: Numeric, matrix [nsim, proyears], or function. If type_T = "u", the harvest rate (ratio of kept catch to of the terminal marine fishery. Function should be of the form function(NO, HO, m) return(u).
K_T: Numeric or function. If type_T = "catch", the catch target of the return in the terminal fishery. Function should be of the form function(NO, HO, m) return(K).
InitEsc: Single numeric or vector [nsim]. The escapement at the beginning of the projection. Default is 1000.
ForeErr: Numeric or matrix [nsim, ngen]. Multiplicative forecast error of the return size. Only used if u_terminal or K_T is a function where fishing intensity is determined by return size. Default is 1 (no error).
ImpErr: Numeric or matrix [nsim, ngen]. Implementation error of terminal fishery harvest. Default is 0 (no error).

Creating Object

Objects can be created by calls of the form new("simpleSOM")

Examples

showClass("simpleSOM")
#> Class "simpleSOM" [package "salmonMSE"]
#> 
#> Slots:
#>                                                                   
#> Name:                 Name                nsim              maxage
#> Class:           character             numeric             numeric
#>                                                                   
#> Name:                 ngen               kappa                Smax
#> Class:             numeric             numeric             numeric
#>                                                                   
#> Name:               sigmaR              Recdev              type_T
#> Class:             numeric              matrix           character
#>                                                                   
#> Name:           u_terminal                 K_T             InitEsc
#> Class: num.matrix.function        num.function             numeric
#>                                               
#> Name:              ForeErr              ImpErr
#> Class:          num.matrix          num.matrix