Ages of Lake Whitefish from four lakes assigned from scales and fin-rays.

Ages of Lake Whitefish (Coregonus clupeaformis) from four lakes as determined by scales and fin-rays.

Format

A data frame with 859 observations on the following 3 variables:

fin: Ages assigned from fin-ray sections
scale: Ages assigned from scales
lake: Lake from which the fish was captured (L122, L226, Huron, or Dezadeash)

Source

From (approximately) Figure 1 of Mills, K.H., and R.J. Beamish. 1980. Comparison of fin-ray and scale age determinations for lake whitefish (Coregonus clupeaformis) and their implications for estimates of growth and annual survival. Canadian Journal of Fisheries and Aquatic Sciences 37:534-544. CSV file

Topic(s)

Age Comparison
Age Precision
Age Bias
Ageing Error

Examples

data(WhitefishMB)
str(WhitefishMB)
#> 'data.frame':	859 obs. of  3 variables:
#>  $ fin  : int  1 1 1 1 1 1 1 1 1 1 ...
#>  $ scale: int  1 1 1 1 1 1 1 1 1 1 ...
#>  $ lake : Factor w/ 4 levels "Dezadeash","Huron",..: 4 4 4 4 4 4 4 4 4 4 ...
head(WhitefishMB)
#>   fin scale lake
#> 1   1     1 L226
#> 2   1     1 L226
#> 3   1     1 L226
#> 4   1     1 L226
#> 5   1     1 L226
#> 6   1     1 L226
op <- par(mfrow=c(2,2),pch=19)
plot(scale~fin,data=WhitefishMB,subset=lake=="L122",main="Lake L122")
plot(scale~fin,data=WhitefishMB,subset=lake=="L226",main="Lake L226")
plot(scale~fin,data=WhitefishMB,subset=lake=="Huron",main="Huron")
plot(scale~fin,data=WhitefishMB,subset=lake=="Dezadeash",main="Dezadeash")

par(op)