#' @title Crab data
#' @name Crab data
#'
#' @description A database containing allometric measures and other attributes of 223 crabs of the specie \eqn{Chionectes} \eqn{tanneri}.
#' The variables carapace width and chela height were published in Somerton & Donaldson (1996).
#'
#' @aliases crabdata
#' @docType data
#' @format A data frame with different variables:
#'
#' \code{year}
#'
#' \code{month}
#'
#' \code{carapace_width} (mm.)
#'
#' \code{carapace_length} (mm.)
#'
#' \code{chela_height} (mm.)
#'
#' \code{chela_width} (mm.)
#'
#' \code{sex_category} (m: male, f: female).
#'
#' @usage data(crabdata)
#' @source
#' Somerton, D. A., & Donaldson, W. (1996). Contribution of the biology of the grooved and triangle Tanner crabs,
#' Chionectes tanneri and C. angulatus, in the eastern Bering Sea. Fishery Bulletin, 94(2), 348-357.
#' @references
#' Watters, G., & Hobday, A. J. (1998). A new method for estimating the morphometric size at maturity of crabs.
#' Canadian Journal of Fisheries and Aquatic Sciences, 55(3), 704-714.
NULL
#' @title Fish gonadal maturity data
#' @name Fish maturity
#'
#' @description A data set containing the total length and the stages of sexual maturity of 1733 fishes.
#'
#' @aliases matFish
#' @docType data
#' @format A data frame with two variables:
#'
#' \code{total_length} the total length in cm.
#'
#' \code{stage_mat} the stages of sexual maturity (gonadal maturation stages, I: immature, II-III-IV: mature)
#' @usage data(matFish)
NULL
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