Annual catches of yearling Walleye in bottom trawls from Lake Winnebago, WI, 1986-2010.

Description

Annual catches of yearling Walleye (Sander vitreus) in bottom trawls from Lake Winnebago, WI, 1986-2010.

Format

A data frame with 35 observations on the following 4 variables.

• tows: Number of trawl tows (i.e., effort)
• year: Year of capture
• yearlings: Number of yearling Walleye captured
• yrclass: Year-class of the captured yearlings (capture year minus 1)

Details

The catch of yearling Walleye and number of trawl tows by year are in this data.frame. The CPE is catch divided by number of tows. Koenigs et al. (2015) rescaled the CPE values to have a mean of 0 and a standard deviation of 1.

Topic(s)

• Year-class Strength
• Recruitment

Note

Used in the Introductory Fisheries Analyses with R book.

Source

From Koenigs, R.P., Bruch, R.M., Stelzer, R.S., and Kamke, K.K. 2015. Validation of otolith ages for Walleye (Sander vitreus) in the Winnebago System. Fisheries Research, 167:13-21. Obtained directly from Ryan Koenigs.

Examples

data(WalleyeWyrlng)
str(WalleyeWyrlng)
head(WalleyeWyrlng)
plot(yearlings~yrclass,data=WalleyeWyrlng)