A large sample (approximately fixed sample size per length interval) of Snapper (Pagrus auratus) were aged, with the remainder of the fish just measured for length. Note that age-16 is actually age 16+ and length 60 is for 60-64 cm and 65 is for 65+ cm.

## Format

A data frame of 6724 observations on the following 2 variables:

len

Measured lengths (cm)

age

Ages assigned

## Source

Recreated from summarized results in Table 8.3 of Quinn, T. J. and R. B. Deriso. 1999. Quantitative Fish Dynamics. Oxford University Press, New York, NY. 542 p. CSV file

## Topic(s)

• Age-Length Key

See the same data in summarized format as alkdata in fishmethods.

## Examples

data(SnapperHG2)
str(SnapperHG2)
#> 'data.frame':	6724 obs. of  2 variables:
#>  $len: int 23 23 23 23 23 24 24 24 24 24 ... #>$ age: int  4 4 4 4 4 3 4 4 4 4 ...
#>   len age
#> 1  23   4
#> 2  23   4
#> 3  23   4
#> 4  23   4
#> 5  23   4
#> 6  24   3

## Extract the aged sample
sn2.aged <- subset(SnapperHG2,!is.na(age))
str(sn2.aged)
#> 'data.frame':	808 obs. of  2 variables:
#>  $len: int 23 23 23 23 23 24 24 24 24 24 ... #>$ age: int  4 4 4 4 4 3 4 4 4 4 ...

## Extract the length sample
sn2.length <- subset(SnapperHG2,is.na(age))
str(sn2.length)
#> 'data.frame':	5916 obs. of  2 variables:
#>  $len: int 24 24 24 24 24 24 24 24 24 24 ... #>$ age: int  NA NA NA NA NA NA NA NA NA NA ...