simpleSOM-class: Class '"simpleSOM"'

In salmonMSE: Management Strategy Evaluation for Salmon Species

Class "simpleSOM"

Description

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-1]⁠ 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).

InitReturn

Single numeric or vector ⁠[nsim]⁠. The return at the beginning of the projection. Default assumes 1000.

Creating Object

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

Examples

showClass("simpleSOM")

salmonMSE documentation built on Aug. 20, 2026, 5:09 p.m.