Ages (subsample) and lengths (all fish) for Rock Bass from Lake Ontario.

Ages (subsample) and lengths (all fish) for Rock Bass from Lake Ontario.

Format

A data frame with 1288 observations on the following 2 variables:

age

Assigned ages (from scales)

tl

Measured total lengths (mm)

Source

CSV file

Details

As many as 10 fish per 10-mm total length intervals from the RockBassLO1 data.frame was obtained for age assignment. The remaining fish in the file were only measure for length (i.e., the ages were deleted). This data file can be used to demonstrate the use of age-length keys.

Topic(s)

• Age-Length Key

See also

RockBassLO1.

Examples

data(RockBassLO2)
str(RockBassLO2)
#> 'data.frame':	1288 obs. of  2 variables:
#>  $ age: int  6 5 7 9 9 7 8 4 6 8 ...
#>  $ tl : int  218 184 211 223 245 181 207 173 201 246 ...
head(RockBassLO2)
#>   age  tl
#> 1   6 218
#> 2   5 184
#> 3   7 211
#> 4   9 223
#> 5   9 245
#> 6   7 181

## extract aged sample
rb.aged <- subset(RockBassLO2,!is.na(age))

## extract length sample
rb.length <- subset(RockBassLO2,is.na(age))