Yellow Perch (Perca flavescens) stock-recruitment by year-class in Chequamegon Bay, 1975-1986.

## Format

A data frame with 12 observations on the following 2 variables:

yrclass

Year-class (see below)

stock

Estimated numbers of mature females caught the year prior to the origin of the 1975-1986 year classes

recruits

Catches of age-2 fish (when the year-class is formed)

## Source

From (approximately) Figure 7 in Bronte et al. 1993. Dynamics of a yellow perch population in Western Lake Superior. North American Journal of Fisheries Management. 13:511-523. CSV file

## Topic(s)

• Stock-Recruit

• Recruitment

## Examples

data(YPerchCB2)
str(YPerchCB2)
#> 'data.frame':	12 obs. of  3 variables:
#>  $yrclass : int 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 ... #>$ stock   : int  354 244 179 157 177 213 266 156 107 47 ...
#>  \$ recruits: int  66 16 52 162 176 319 744 380 279 225 ...
#>   yrclass stock recruits
#> 1    1975   354       66
#> 2    1976   244       16
#> 3    1977   179       52
#> 4    1978   157      162
#> 5    1979   177      176
#> 6    1980   213      319
op <- par(mfrow=c(1,2),pch=19)
plot(recruits~yrclass,data=YPerchCB2,type="b")
plot(recruits~stock,data=YPerchCB2)

par(op)