WalleyePS {FSAdata} | R Documentation |
Ages of Walleye assigned from otoliths, scales, and spines.
Description
Age of Pymatuning Sanctuary (PA) Walleye (Sander vitreus) assessed from three calcified structures – sectioned otoliths, sectioned dorsal spines, and scale impressions.
Format
A data frame with 61 observations on the following 4 variables:
- otolith
Age (years) assigned from broken, ground, and polished otolith sections
- spine
Age (years) assigned from dorsal spine sections
- scale
Age (years) assigned from scale impressions
- sex
Sex of fish (
female
andmale
)
Topic(s)
Age Comparison
Age Precision
Age Bias
Ageing Error
Note
Relationships between otoliths and spines and otoliths and scales are exact according to Figure 2. Relationship between spines and scales is approximate as Figure 2 did not show this exact relationship.
Source
From Figure 2 in Kocovsky, P.M., and R.M. Carline. 2000. A comparison of methods for estimating ages of unexploited walleyes. North American Journal of Fisheries Management 20:1044-1048. CSV file
Examples
data(WalleyePS)
str(WalleyePS)
head(WalleyePS)
op <- par(mfrow=c(3,2),pch=19)
plot(scale~otolith,data=WalleyePS,subset=sex=="female",main="Female")
plot(scale~otolith,data=WalleyePS,subset=sex=="male",main="Male")
plot(scale~spine,data=WalleyePS,subset=sex=="female",main="Female")
plot(scale~spine,data=WalleyePS,subset=sex=="male",main="Male")
plot(spine~otolith,data=WalleyePS,subset=sex=="female",main="Female")
plot(spine~otolith,data=WalleyePS,subset=sex=="male",main="Male")
par(op)