Stock and recruitment data for Yellow Perch in Chequamegon Bay, 1975-1986.
Source:R/YPerchCB2.R
YPerchCB2.Rd
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
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 ...
head(YPerchCB2)
#> 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)