R/CatchPerUnitEffort.R

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

#' Catch Per Unit Effort (CPUE)
#'
#' The quantity of fish caught (in number or in weight)
#' with one standard unit of fishing effort; e.g. number of
#' fish taken per 1,000 hooks per day or weight of fish,
#' in tons, taken per hour of trawling. CPUE is often
#' considered an index of fish biomass (or abundance).
#' Sometimes referred to as catch rate. CPUE may be used
#' as a measure of economic efficiency of fishing as well as
#' an index of fish abundance.
#'
#' @format
#' \describe{
#' \item{Examples}{fishery-independent CPUE}
#' \item{Rationale}{Many models use the term index for a survey and CPUE for
#' fishery-dependent data but they are typically entered into an input
#' file in the same way and the naming should be standardized to a single
#' overarching term. The overarching term would facilitate the inclusion of
#' environmental data thought to index at least a portion of the population
#' dynamics as well as fishery data. Environmental data does not necessarily
#' have a catch or unit of effort associated with it, and thus, the term CPUE
#' does not apply. Often CPUE data are thought to be a relative index of
#' abundance and would never be considered absolute such as can be the case
#' for an acoustic survey that does not kill the population but rather creates
#' a metric of its abundance potentially over the entire area in which it is
#' thought to inhabit. Where, an absolute index of abundance would be assumed
#' to have a catchability of one.}
#' \item{Alternatives}{catch rate, index of abundance, standardized fishery
#' catch time series, catch per effort, fishing success, availability.}
#' \item{Range of possible values}{0--Inf}
#' \item{Units}{}
#' }
CatchPerUnitEffort <- NULL