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

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)

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. CSV file

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.

Note

Used in the Introductory Fisheries Analyses with R book.

Topic(s)

Year-class Strength
Recruitment

Examples

data(WalleyeWyrlng)
str(WalleyeWyrlng)
#> 'data.frame':	25 obs. of  4 variables:
#>  $ year     : int  1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 ...
#>  $ yrclass  : int  1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 ...
#>  $ yearlings: num  67 55 4 4 17 68 549 65 199 7 ...
#>  $ tows     : int  127 138 138 138 90 137 138 138 135 138 ...
head(WalleyeWyrlng)
#>   year yrclass yearlings tows
#> 1 1986    1985        67  127
#> 2 1987    1986        55  138
#> 3 1988    1987         4  138
#> 4 1989    1988         4  138
#> 5 1990    1989        17   90
#> 6 1991    1990        68  137
plot(yearlings~yrclass,data=WalleyeWyrlng)