Catch-at-age for Walleye.

Description

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

Topic(s)

• Mortality
• Catch curve

Source

From various tables in Borkholder, B.D., A.J. Edwards, and C. Olson. 2007. Spring adult and fall juvenile walleye popluation surveys within the 1854 ceded territory of Minnesota, 2006. Fond du Lac Division of Resource Management, Technical Report 41. [Was (is?) from http://www.1854treatyauthority.org/cms/files/REP%20Fish%20Walleye%20Survey%202006.pdf.]

Examples

data(WalleyeMN06a)
str(WalleyeMN06a)
head(WalleyeMN06a)
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)