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#' @title Ages, lengths, and sexes of European Perch.
#'
#' @description Assigned ages, measured fork lengths, and observed sexes for European Perch (\emph{Perca fluviatilis}) from Lake Tjuekemeer (The Netherlands).
#'
#' @name EuroPerchTJ
#'
#' @docType data
#'
#' @format A data frame of 69 observations on the following 3 variables:
#' \describe{
#' \item{fl}{Fork lengths (cm).}
#' \item{age}{Assigned ages.}
#' \item{sex}{Sex (female, male).}
#' }
#'
#' @section Topic(s):
#' \itemize{
#' \item Growth
#' \item fon Bertalanffy
#' }
#'
#' @concept Growth
#' @concept von Bertalanffy
#'
#' @source From (approximately) Figure 2 in Mooij, W.M., J.M. Van Rooij, and S. Wijnhoven. 1999. Analysis and comparison of fish growth from small samples of length-at-age data: Detection of sexual dimorphism in Eurasian perch as an example. Transactions of the American Fisheries Society, 128:483-490. \href{https://raw.githubusercontent.com/fishR-Core-Team/FSAdata/main/data-raw/EuroPerchTJ.csv}{CSV file}
#'
#' @keywords datasets
#'
#' @examples
#' data(EuroPerchTJ)
#' str(EuroPerchTJ)
#' head(EuroPerchTJ)
#' op <- par(mfrow=c(1,2),pch=19)
#' plot(fl~age,data=EuroPerchTJ,subset=sex=="female",main="Female")
#' plot(fl~age,data=EuroPerchTJ,subset=sex=="male",main="Male")
#' par(op)
#'
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