Sets up gear parameters from Ecopath catch data

Uses the Catch data frame exported by Ecopath to set up gear parameters. Currently this sets up only a single gear for the total catch. The yield_observed gear parameter is set to the total catch for each species. The catchability is set to the ratio of the observed yield to the observed biomass. The selectivity of the gear is set to be sigmoidal with 50% of fish selected at maturity size and 25% selected at 90% of maturity size (measured in weight). Fishing is turned on with an initial effort of 1. The result will therefore not be at steady state yet.

Usage

addEcopathCatchTotal(params, ecopath_catch)

Arguments

params

A MizerParams object

ecopath_catch

The Ecopath Catch data frame

Value

A MizerParams object with gear parameters set up and fishing effort switched on.

Details

The catchability set by this function for each gear will be an underestimation of the catchability needed to produce the observed yield because setting it to the ratio of the observed yield to the observed biomass neglects that some of the biomass will be at sizes that are not fully selected by the gear. You will need to call matchCatch() to adjust the catchability to match the observed yield.