akfin.calcBycatchABs: Calculate estimated total bycatch abundance and biomass of...

In wStockhausen/tcsamFisheryDataAKFIN: Functions to process AKFIN data for crab bycatch

Calculate estimated total bycatch abundance and biomass of Tanner crab in groundfish fisheries

Description

Function to calculate estimated total catch abundance by expanding observed abundance.

Usage

akfin.calcBycatchABs(
  maxYear = 2019,
  fnHIS = "GroundfishFisheries.HistoricalBycatchBiomass.TannerCrab.csv",
  fnCAS = "FromAKFIN.TannerCrab.BycatchEstimates.CAS.csv",
  fnCIA = "FromAKFIN.TannerCrab.BycatchEstimates.CIA.csv",
  verbosity = 0
)

Arguments

maxYear	max fishery year to extract
fnHIS	filename for bycatch estimates from "historical data" (pre-CAS)
fnCAS	filename for bycatch estimates from Catch Accounting System
fnCIA	filename for bycatch estimates from Catch-In_Areas database
verbosity	integer flag for diagnostic printout (0,1,2)

Details

Uses sqldf::sqldf. Units for 'weight' are kg, for 'abundance' are thousands, and for 'biomass' are t. Historical (foreign, joint veture) data runs 1973-1990. CAS data is used for 1991-2008. CIA data is used for 2009+.

Value

tibble with columns

• fishery

• area

• year

• expFactor - expansion factor

• sex - "male", "female", "undetermined", "hermaphrodite", or NA

• variable - "count", "weight", "abundance", or "biomass"

• value - value of associated variable

• type - "observed" or "expanded"

• units - "ones", "thousands", "kg" or "t"

wStockhausen/tcsamFisheryDataAKFIN documentation built on Aug. 30, 2023, 12:08 p.m.