AlewifeLH {FSAdata}

Ages of Lake Huron Alewife assigned from otoliths and scales.

Description

Ages of Alewife (Alosa pseudoharengus) assessed from otoliths and scales.

Format

A data frame of 104 observations on the following 2 variables:

otoliths

Age assigned from examination of otoliths

scales

Age assigned from examination of scales

Topic(s)

• Age Comparison

• Age Precision

• Age Bias

• Ageing Error

Source

From Table 1A of Hoenig, J.M., M.J. Morgan, and C.A. Brown. 1995. Analysing differences between two age determination methods by tests of symmetry. Canadian Journal of Fisheries And Aquatic Systems, 52:364-368. Originally from O'Gorman, R., D.H. Barwick, and C.A. Bowen. 1987. Discrepancies between ages determined from scales and otoliths for alewives from the Great Lakes. pp. 203-210 In. Summerfelt, R.C. and G.E. Hall (Eds.) Age and Growth of Fish. Iowa State University Press, Ames, IA. CSV file

Examples

data(AlewifeLH)
str(AlewifeLH)
head(AlewifeLH)
plot(scales~otoliths,data=AlewifeLH)
xtabs(~otoliths+scales,data=AlewifeLH)