Ages (subsample) and lengths (all fish) for Creek Chub.

Ages (subsample) and lengths (all fish) for Creek Chub (Semotilus atromaculatus).

Format

A data frame with 218 observations on the following 2 variables.

len: Total length (mm)
age: Assigned ages (yrs; from scales)

Source

Recreated (random digits were added to construct mm lengths from the cm length bins) from information in Box 15.2 of Quist, M.C., Pegg, M.A., and DeVries, D.R. 2012. Age and growth. In Zale, A.V., Parrish, D.L., and Sutton, T.M., editors. Fisheries Techniques, Third Edition, chapter 15, pages 677-731. American Fisheries Society, Bethesda, MD. CSV file

Details

As many as 10 fish per 10 mm length interval were sampled for age assignment with scales.

Note

Used in the Introductory Fisheries Analyses with R book.

Topic(s)

Age-Length Key
Growth

Examples

data(CreekChub)
str(CreekChub)
#> 'data.frame':	218 obs. of  2 variables:
#>  $ len: int  41 42 42 42 43 44 45 46 47 48 ...
#>  $ age: int  0 0 0 0 0 0 0 0 0 0 ...
head(CreekChub)
#>   len age
#> 1  41   0
#> 2  42   0
#> 3  42   0
#> 4  42   0
#> 5  43   0
#> 6  44   0
xtabs(~age,data=CreekChub)
#> age
#>  0  1  2  3  4 
#> 13 48 29  8  5 
plot(len~age,data=CreekChub)