#' @title Ages and lengths of Bull Trout from two Rocky Mountain lakes at two times.
#'
#' @description Assigned ages (from otoliths) and fork lengths of Bull Trout (\emph{Salvelinus confluentis}) from two Rocky Mountain lakes in Alberta, CAN before and after a regulation change.
#'
#' @note The historical (1977-1980) era samples were from before restrictive sportfishing regulatory regimes were implemented (in the 1990s) that led to changes in abundance and population structure of bull trout.
#'
#' @name BullTroutRML2
#'
#' @docType data
#'
#' @format A data frame with 96 observations on the following 4 variables:
#' \describe{
#' \item{age}{Age (from otoliths).}
#' \item{fl}{Fork length (mm).}
#' \item{lake}{Lake (\code{Harrison} and \code{Osprey}).}
#' \item{era}{Era of collection (\code{1977-80} and \code{1997-01}). See details.}
#' }
#'
#' @section Topic(s):
#' \itemize{
#' \item Growth
#' \item Von Bertalanffy growth model
#' }
#'
#' @concept Growth
#' @concept Von Bertalanffy
#'
#' @source From (approximately) Figure 2 of Parker, B.R., D.W. Schindler, F.M. Wilhelm, and D.B. Donald. 2007. Bull trout population responses to reductions in angler effort and retention limits. North American Journal of Fisheries Management 27:848-859. \href{https://raw.githubusercontent.com/fishR-Core-Team/FSAdata/main/data-raw/BullTroutRML2.csv}{CSV file}
#'
#' @keywords datasets
#'
#' @examples
#' data(BullTroutRML2)
#' str(BullTroutRML2)
#' head(BullTroutRML2)
#' op <- par(mfrow=c(2,2),pch=19)
#' plot(fl~age,data=BullTroutRML2,subset=lake=="Harrison" & era=="1977-80",main="Harrison, 1977-80")
#' plot(fl~age,data=BullTroutRML2,subset=lake=="Harrison" & era=="1997-01",main="Harrison, 1997-2001")
#' plot(fl~age,data=BullTroutRML2,subset=lake=="Osprey" & era=="1977-80",main="Osprey, 1977-80")
#' plot(fl~age,data=BullTroutRML2,subset=lake=="Osprey" & era=="1997-01",main="Osprey, 1997-2001")
#' par(op)
#'
NULL
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