R/Biomass.R

In nmfs-fish-tools/data_dictionary: Collaborative tool to improve consistency in terminology and develop a framework of tools for fisheries science.

#' Biomass
#'
#' Weight of fish within a stock. If referring to a certain portion of the
#' stock, it should be made clear what portion of the stock the biomass
#' pertains to. Model output related to biomass is assumed to be measured
#' at the beginning of the year unless otherwise specified.
#'
#' @format
#' \describe{
#' \item{Examples}{spawning biomass, age three-plus biomass, exploitable
#' biomass, January 1 biomass}
#' \item{Rationale}{Measurements of biomass should be better defined making
#'  it clear what year classes and sexes it includes. Historically, verbose
#' labels, e.g., January 1 biomass of age-three plus fish in 2022, are not
#' typically used; instead, labels are short, e.g., 2022 3+ biomass.
#' Additional ambiguity can come from the lack of knowledge regarding the
#' unit of measurement, which should always be metric tons. Some alternatives
#'  are not interchangeable because they are in different units, e.g.,
#' abundance, which is in terms of numbers rather than weight.}
#' \item{Alternatives}{stock biomass, total biomass, abundance (numbers of fish),
#' biomass wet weight, biomass index}
#' \item{Range of possible values}{0--Inf}
#' \item{Units}{mt}
#' }
Biomass <- NULL