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Ages (subsample) and lengths (all fish) for Snapper.

Source: R/SnapperHG2.R
SnapperHG2.Rd

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 also

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 ...
head(SnapperHG2)
#>   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 ...