Stock and recruitment data for Crappies from four reservoirs in Arkansas and Mississippi, USA.

Format

A data frame of 78 observations on the following 3 variables:

reservoir: Reservoir (Atkins, Nimrod, Okatibbee, Ross.Barnett)
stock: Number of age-1+ fish per hectare
recruits: Number of age-0 fish per hectare

Source

From (approximately) Figure 2 of Allen, M.S. and L.E. Miranda. 1998. An age-structured model for erratic crappie fisheries. Ecological Modeling 107:289-303. CSV file

Topic(s)

Stock-Recruit
Recruitment

Examples

data(CrappieARMS)
str(CrappieARMS)
#> 'data.frame':	78 obs. of  3 variables:
#>  $ reservoir: Factor w/ 4 levels "Atkins","Nimrod",..: 3 3 3 3 3 3 3 3 3 3 ...
#>  $ stock    : num  3494 1278 1049 825 685 ...
#>  $ recruits : num  241 1644 1812 4716 7945 ...
head(CrappieARMS)
#>   reservoir  stock recruits
#> 1 Okatibbee 3494.2    241.3
#> 2 Okatibbee 1278.4   1643.6
#> 3 Okatibbee 1049.3   1812.4
#> 4 Okatibbee  825.1   4715.5
#> 5 Okatibbee  685.2   7944.8
#> 6 Okatibbee  529.1   8841.2
op <- par(mfrow=c(2,2),mar=c(3,3,2,1),mgp=c(1.75,0.5,0),tcl=-0.2,pch=19)
plot(recruits~stock,data=CrappieARMS,subset=(reservoir=="Atkins"),main="Atkins")
plot(recruits~stock,data=CrappieARMS,subset=(reservoir=="Nimrod"),main="Nimrod")
plot(recruits~stock,data=CrappieARMS,subset=(reservoir=="Okatibbee"),main="Okatibbee")
plot(recruits~stock,data=CrappieARMS,subset=(reservoir=="Ross.Barnett"),main="Ross Barnett")

par(op)