add_lw_info: Add species length weight information to cleaned SURVDAT...

In gulfofmaine/gmRi: Utility Functions for GMRI Research Team

Add species length weight information to cleaned SURVDAT trawl data

Description

calculate expected biomass-at-length for species based on published length-weight relationships.

Species are matched against a spreadsheet containing length and weight information from 2 sources. The first source is the length-weight relationships detailed in Wigley et al. 2003: "Length-weight relationships for 74 fish species collected during NEFSC research vessel bottom trawl surveys, 1992-99".

The second source for matching growth details to species is fishbase. These values are known to be potentially less accurate or less regionally specific.

Pairings are first checked against the Wigley paper, and then by fishbase, to provide preference to the more regionally focused source.

Usage

add_lw_info(survdat_clean, cutoff = FALSE, box_location = "root|cloudstorage")

Arguments

survdat_clean	Survdat data, after usual preparations are completed. These include removal of old strata, labeling of areas of interest, and inclusion of the annual effort in each.
cutoff	Flag for whether to remove species that have shown poor fit when compared to biomass data from the nmfs survey.
box_location	String indicating value to pass to 'boxpath_switch'

Value

survdat dataframe containing paired length-weight relationship details for species

Examples

# not run
# add_lw_info(survdat_clean = survdat_clean, cutoff = T)

gulfofmaine/gmRi documentation built on Jan. 26, 2025, 5:12 a.m.