calcMMBMating: Calculate projected MMB at mating.

In wStockhausen/rPIBKC: Package to run the PIBKC stock assessment

Calculate projected MMB at mating.

Description

Function to calculate MMB at mating.

Usage

calcMMBMating(
  fshData,
  avgSrvData,
  avgType = "RE",
  M = 0.18,
  t.sf = 3/12,
  t.fm = 4/12,
  hm.pot = 0.2,
  hm.trl = 0.8,
  pct.male = 0.5,
  showPlot = FALSE
)

Arguments

fshData	dataframe with fishery data
avgSrvData	dataframe with MMB at time of survey
avgType	type of survey MMB to use ('raw', 'IV' or 'RE'; default='RE')
M	assumed rate of natural mortality (default=0.18)
t.sf	time from survey to fishery (default=3/12 year)
t.fm	time from fishery to mating (default=4/12 year)
hm.pot	handling mortality rate for fixed gear (pot) fisheries (default=0.2)
hm.trl	handling mortality rate for trawl fisheries (default=0.8)
pct.male	assumed male percentage (default=0.5)
showPlot	flag to show plot (T/F; default=FALSE)

Details

annual estimates of MMB at mating are calculated using

MMB_{mating} = (MMB_{survey} \cdot e^{-M \cdot t_{sf}}-M_F) \cdot e^{-M \cdot t_{fm}}

where

• MMB_{survey} is MMB at the time of the survey

• t_{sf} is the fraction of the year from the survey to the (pulse) fishery

• t_{fm} is the fraction of the year from the (pulse) fishery to mating

• M is the rate of natural mortality

• M_F is total fishing mortality (retained + discard mortality) on mature males

Value

list with MMB at mating and other time series. Elements are:

• mmbMat = MB at maturity

• mmbFsh = MMB just prior to the fishery

• mmbSrv = MMB at survey time

• retM = retained mortality

• dscM = list with elements:

  • tot = total discard mortality

  • gft = groundfish trawl fisheries mortality

  • gfp = groundfish pot fisheries mortality

  • crb = crab fisheries discard mortality

• plots = list with elements:

  • MMB = MMB time series ggplot2 plot object

wStockhausen/rPIBKC documentation built on April 25, 2023, 6:50 p.m.