Ages and lengths of Channel Darters from two locations.

Assigned ages (from otoliths), total length, and collection location of Channel Darter (Percina copelandi).

Format

A data frame of 54 observations on the following 3 variables:

age: Otolith age-at-capture (years).
tl: Total length (nearest 0.1 mm) at capture.
river: Location of capture (Salmon or Trent Rivers).

Source

From Figure 2 of Reid, S.M. Age estimates and length distributions of Ontario channel darter (Percina copelandi) populations. Journal of Freshwater Ecology 19:441-444. CSV file

Note

The original author used a linear model to describe the relationship between length and age.

Topic(s)

Growth
von Bertalanffy

Examples

data(DarterOnt)
str(DarterOnt)
#> 'data.frame':	54 obs. of  3 variables:
#>  $ age  : int  1 2 2 2 2 2 2 2 3 3 ...
#>  $ tl   : num  37.8 39.7 43.6 46.7 47.6 50.4 51.2 56.2 60.5 56.2 ...
#>  $ river: Factor w/ 2 levels "Salmon","Trent": 1 1 1 1 1 1 1 1 1 1 ...
head(DarterOnt)
#>   age   tl  river
#> 1   1 37.8 Salmon
#> 2   2 39.7 Salmon
#> 3   2 43.6 Salmon
#> 4   2 46.7 Salmon
#> 5   2 47.6 Salmon
#> 6   2 50.4 Salmon
op <- par(mfrow=c(1,2),pch=19)
plot(tl~age,data=DarterOnt,subset=river=="Salmon",main="Salmon R.")
plot(tl~age,data=DarterOnt,subset=river=="Trent",main="Trent R.")

par(op)