Biological data for Ruffe captured from the St. Louis River in 1992.

Description

Biological data for Ruffe (Gymnocephalus cernuus) captured in the St. Louis River, Lake Superior in 1992.

Format

A data frame of 738 observations on the following 11 variables:

• fish.id: A unique fish identification number (across all years, most of which are not shown in this file
• month: Month (numeric) of capture

• day: Day of capture
• year: Year of capture

• indiv: A unique fish identification number within the year
• location: Grid location of capture
• length: Total length (mm)
• weight: Weight (g)

• sex: Sex factor (female, male, or unknown)
• maturity: Maturity stage factor (developing, immature, mature, nearly.ripe, nearly.spent, recovering, ripe, running, spent, unknown, or yoy)
• age: Age (yrs) from scales

Topic(s)

• Length Frequency
• Weight-Length
• Growth
• von Bertalanffy
• Maturity

Source

personal collection by the United States Geological Survey, Lake Superior Biological Station, Ashland, WI.

Examples

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)