Biological data for Ruffe captured from the St. Louis River in 1992.
Biological data for Ruffe (Gymnocephalus cernuus) captured in the St. Louis River, Lake Superior in 1992.
A data frame of 738 observations on the following 11 variables:
A unique fish identification number (across all years, most of which are not shown in this file
Month (numeric) of capture
Day of capture
Year of capture
A unique fish identification number within the year
Grid location of capture
Total length (mm)
Weight (g)
Sex factor (female, male, or unknown)
Maturity stage factor (developing, immature, mature, nearly.ripe, nearly.spent, recovering, ripe, running, spent, unknown, or yoy)
Age (yrs) from scales
Length Frequency
Weight-Length
Growth
von Bertalanffy
Maturity
personal collection by the United States Geological Survey, Lake Superior Biological Station, Ashland, WI.
data(RuffeSLRH92)
str(RuffeSLRH92)
head(RuffeSLRH92)
op <- par(mfrow=c(2,2),pch=19)
hist(RuffeSLRH92$length,main="")
hist(RuffeSLRH92$age,main="")
plot(weight~length,data=RuffeSLRH92)
plot(length~age,data=RuffeSLRH92)
par(op)
xtabs(~age,data=RuffeSLRH92)
xtabs(~sex,data=RuffeSLRH92)
tmp <- c("yoy","immature","developing","mature","nearly.ripe","ripe",
"running","nearly.spent","spent","recovering","unknown")
RuffeSLRH92$maturity <- ordered(RuffeSLRH92$maturity,levels=tmp)
xtabs(~maturity,data=RuffeSLRH92)
xtabs(~maturity+month+sex,data=RuffeSLRH92)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.