initial_effort: Initial fishing effort

In mizer: Dynamic Multi-Species Size Spectrum Modelling

Initial fishing effort

Description

The fishing effort is a named vector, specifying for each fishing gear the effort invested into fishing with that gear. The effort value for each gear is multiplied by the catchability and the selectivity to determine the fishing mortality imposed by that gear, see setFishing() for more details. The initial effort you have set can be overruled when running a simulation by providing an effort argument to project() which allows you to specify a time-varying effort.

Usage

initial_effort(params)

initial_effort(params) <- value

validEffortVector(effort, params)

Arguments

params	A MizerParams object
value	A vector or scalar with the initial fishing effort, see Details below.
effort	A vector or scalar with the initial fishing effort, see Details below.

Details

A valid effort vector is a named vector with one effort value for each gear. However you can also supply the effort value in different ways:

• a scalar, which is then replicated for each gear

• an unnamed vector, which is then assumed to be in the same order as the gears in the params object

• a named vector in which the gear names have a different order than in the params object. This is then sorted correctly.

• a named vector which only supplies values for some of the gears. The effort for the other gears is then set to zero.

These conversions are done by the function validEffortVector().

An effort argument will lead to an error if it is either

• unnamed and of the wrong length

• named but where some names do not match any of the gears

• not numeric

Value

Effort vector

mizer documentation built on Oct. 17, 2024, 9:07 a.m.