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

Description

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)

Topic(s)

• Age Comparison
• Age Precision
• Age Bias
• Ageing Error

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.

Examples

data(WhitefishMB)
str(WhitefishMB)
head(WhitefishMB)
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)