Ages and lengths of Channel Darters from two locations.
Assigned ages (from otoliths), total length, and collection location of Channel Darter (Percina copelandi).
A data frame of 54 observations on the following 3 variables:
Otolith age-at-capture (years).
Total length (nearest 0.1 mm) at capture.
Location of capture (Salmon or Trent Rivers).
Growth
von Bertalanffy
The original author used a linear model to describe the relationship between length and age.
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.
data(DarterOnt) str(DarterOnt) head(DarterOnt) 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)
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