Biological data for Black Drum from Virginia waters of the Atlantic Ocean, 2001.

Biological data (lengths, weights, ages (from otoliths), and sex) for Black Drum (Pogonias cromis) from Virginia waters of the Atlantic Ocean, 2001.

Format

A data frame with 141 observations on the following 9 variables.

year: Year of capture (all 2001)
agid: Unique identification number
spname: Species name (all “Black Drum”)
month: Month of capture
day: Day of capture
weight: Weight (lbs) -- most are missing
tl: Total length (mm)
sex: Sex (female, male, and unknown)
otoage: Age (yrs; from otoliths)

Source

Obtained directly from the Virginia Marine Resources Commission via Hank Liao. CSV file

Note

Used in the Introductory Fisheries Analyses with R book.

Topic(s)

Growth
von Bertalanffy
Weight-Length

Examples

data(BlackDrum2001)
str(BlackDrum2001)
#> 'data.frame':	141 obs. of  9 variables:
#>  $ year  : int  2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 ...
#>  $ agid  : int  1 2 3 4 5 6 7 8 9 10 ...
#>  $ spname: Factor w/ 1 level "Black Drum": 1 1 1 1 1 1 1 1 1 1 ...
#>  $ month : int  4 5 5 5 5 5 5 5 5 5 ...
#>  $ day   : int  30 2 3 3 10 10 10 10 11 11 ...
#>  $ weight: num  15.7 12.4 74 47 NA ...
#>  $ tl    : num  788 700 1295 1035 1205 ...
#>  $ sex   : Factor w/ 4 levels "female","immature",..: 3 3 1 1 4 1 4 3 1 1 ...
#>  $ otoage: int  6 5 61 15 33 19 23 23 3 2 ...
head(BlackDrum2001)
#>   year agid     spname month day weight     tl     sex otoage
#> 1 2001    1 Black Drum     4  30  15.74  787.5    male      6
#> 2 2001    2 Black Drum     5   2  12.40  700.0    male      5
#> 3 2001    3 Black Drum     5   3  74.00 1295.0  female     61
#> 4 2001    4 Black Drum     5   3  47.00 1035.0  female     15
#> 5 2001    5 Black Drum     5  10     NA 1205.0 unknown     33
#> 6 2001    6 Black Drum     5  10     NA 1155.0  female     19
plot(tl~otoage,data=BlackDrum2001)