selectivity: Selectivity at age

In vquennessen/densityratio: Using Density Ratios to Help Manage Fisheries In And Around Marine Reserves

Selectivity at age

Description

selectivity returns a vector of selectivities at age, on the interval (0, 1).

Usage

selectivity(
  Rec_age,
  Max_age,
  A1,
  L1,
  A2,
  L2,
  K,
  Fleets,
  A50_up,
  A50_down,
  Alpha,
  F_fin,
  Beta,
  Cf
)

Arguments

Rec_age	numeric value, the age at recruitment, in years.
Max_age	numeric value, the maximum age or total lifespan, in years.
A1	numeric value, age 1 of female fish in years.
L1	numeric value, the length of females at age 1, in cm.
A2	numeric value, age 2 of female fish in years.
L2	numeric value, the length of females at age 2, in cm.
K	numeric value, the von Bertalanffy growth parameter for females. each fleet, on the interval (0, 1).
Fleets	character vector, the names of all fishing fleets that contribute to selectivity at age.
A50_up	numeric vector, the age values at which selectivity is equal to 0.5 on the upcurve for each fishing fleet in Fleets on the interval (0, 1).
A50_down	numeric vector, the age values at which selectivity is equal to 0.5 on the downcurvefor each fishing fleet in Fleets on the interval (0, 1).
Alpha	numeric vector, the alpha values for each fishing fleet in Fleets, the relative slope of the upcurve on the interval (0, 1).
F_fin	numeric vector, the final selectivity values for each fishing fleet in Fleets on the interval (0, 1).
Beta	numeric vector, the beta values for each fishing fleet in Fleets, the relative slope of the downcurve if dome-shaped on the interval (0, 1).
Cf	numeric vector, the fraction of the whole fishery represented by

Value

A numeric vector of selectivities at age, from recruitment to maximum age, on the interval (0, 1).

Examples

selectivity(Rec_age = 2, Max_age = 35, A1 = 5, L1 = 32.21, A2 = 15,
   L2 = 47.95, K = 0.2022, Fleets = c('sport', 'hook', 'trawl'),
   A50_up = c(2, 5, 10), A50_down = c(6, 16, 35), Alpha = c(0.33, 0.6, 0.64),
   F_fin = c(0.25, 0.06, 1), Beta = c(1.2, 0.6, 0), Cf = c(0.71, 0.28, 0.01))

vquennessen/densityratio documentation built on Aug. 28, 2022, 5:36 p.m.