Catch-at-age for Walleye (Sander vitreus) collected from four lakes in Northern Minnesota, USA.
Format
A data frame with 52 observations on the following 3 variables.
- lake
A factor vector of collection lake (
Crooked,Fourmile,Island,Tom)- age
A numeric vector of assigned ages (from dorsal spines)
- number
A numeric vector of number of fish
Source
From various tables in Borkholder, B.D., A.J. Edwards, and C. Olson. 2007. Spring adult and fall juvenile walleye population surveys within the 1854 ceded territory of Minnesota, 2006. Fond du Lac Division of Resource Management, Technical Report 41. CSV file
Examples
data(WalleyeMN06a)
str(WalleyeMN06a)
#> 'data.frame': 52 obs. of 3 variables:
#> $ lake : Factor w/ 4 levels "Crooked","Fourmile",..: 3 3 3 3 3 3 3 3 3 3 ...
#> $ age : int 3 4 5 6 7 8 9 10 11 12 ...
#> $ number: int 1376 1715 1241 281 151 100 43 41 12 11 ...
head(WalleyeMN06a)
#> lake age number
#> 1 Island 3 1376
#> 2 Island 4 1715
#> 3 Island 5 1241
#> 4 Island 6 281
#> 5 Island 7 151
#> 6 Island 8 100
op <- par(mfrow=c(2,2),pch=19)
plot(log(number)~age,data=WalleyeMN06a,subset=lake=="Crooked")
plot(log(number)~age,data=WalleyeMN06a,subset=lake=="Fourmile")
plot(log(number)~age,data=WalleyeMN06a,subset=lake=="Island")
plot(log(number)~age,data=WalleyeMN06a,subset=lake=="Tom")
par(op)