Ages and lengths of Longjaw Cisco from two locations in Lake Michigan.

Assigned age (by scales) and total length of Longjaw Cisco (Leucichthys alpenae) captured at two locations in Lake Michigan.

Format

A data frame with 378 observations on the following 3 variables.

age: Assigned age (by scales).
tl: Measured total length (mm).
loc: Capture location (NE=northeast and S=south).

Source

Simulated from age-length data provided in tables 2 and 3 of Jobes, F.W. 1946. The age, growth, and distribution of the longjaw cisco, Leucichthys alpenae Koelz, in Lake Michigan. Transactions of the American Fisheries Society 76:215-247. CSV file

Topic(s)

Growth
von Bertalanffy

Examples

data(LJCisco)
str(LJCisco)
#> 'data.frame':	378 obs. of  3 variables:
#>  $ age: int  2 2 2 2 2 2 2 2 2 2 ...
#>  $ tl : int  208 210 227 223 233 237 232 234 234 231 ...
#>  $ loc: Factor w/ 2 levels "NE","S": 1 1 1 1 1 1 1 1 1 1 ...
head(LJCisco)
#>   age  tl loc
#> 1   2 208  NE
#> 2   2 210  NE
#> 3   2 227  NE
#> 4   2 223  NE
#> 5   2 233  NE
#> 6   2 237  NE
op <- par(mfrow=c(1,2))
plot(tl~age,data=LJCisco,subset=loc=="NE",main="northeast")
plot(tl~age,data=LJCisco,subset=loc=="S",main="south")

par(op)