Lengths for Walleye, Yellow Perch, Black Crappie, and Black Bullheads from Lake Herman, SD.

Total lengths of Walleye (Sander vitreus), Yellow Perch (Perca flavescens), Black Crappie (Pomoxis nigromaculatus), and Black Bullheads (Ameiurus melas) for four years in Lake Herman, SD.

Format

A data frame of 5931 observations on the following 3 variables:

tl: Total lengths (cm).
spec: Species codes (wae=walleye, yep=yellow perch, bkc=black crappie, and bbh=black bullhead).
yr: Capture years.

Source

From a South Dakota Fish and Game report. CSV file

Details

Lake Herman was sampled on June 20-22, 2005 with four overnight gillnet sets and 10 overnight trapnet sets. The trapnets were constructed with 19-mm (0.75 in) bar-mesh netting, 0.9 m high x 1.5 m wide (3 ft high x 5 ft wide) frames and 18.3 m (60 ft) long leads. The gillnets were 45.7 m long x 1.8 m deep (150 ft long x 6 ft deep) with one 7.6 m (25 ft) panel each of 13, 19, 25, 32, 38 and 51-mm (0.5, 0.75, 1, 1.25, 1.5, and 2 in) bar-mesh monofilament netting.

Topic(s)

Length Frequency
Size Structure
PSD

Examples

data(Herman)
str(Herman)
#> 'data.frame':	5931 obs. of  3 variables:
#>  $ tl  : num  16.6 19.2 20.1 21.1 27.7 27.5 28 29.7 30.3 31.4 ...
#>  $ spec: Factor w/ 4 levels "bbh","bkc","wae",..: 3 3 3 3 3 3 3 3 3 3 ...
#>  $ yr  : int  1999 1999 1999 1999 1999 1999 1999 1999 1999 1999 ...
head(Herman)
#>     tl spec   yr
#> 1 16.6  wae 1999
#> 2 19.2  wae 1999
#> 3 20.1  wae 1999
#> 4 21.1  wae 1999
#> 5 27.7  wae 1999
#> 6 27.5  wae 1999
op <- par(mfrow=c(2,2),pch=19)
### Four (of 16 possible) examples
with(subset(Herman,spec=="bbh" & yr==2003),hist(tl,main="Black Bullhead, 2003"))
with(subset(Herman,spec=="bkc" & yr==2001),hist(tl,main="Black Crappie, 2001"))
with(subset(Herman,spec=="yep" & yr==2003),hist(tl,main="Yellow Perch, 2003"))
with(subset(Herman,spec=="wae" & yr==1999),hist(tl,main="Walleye, 1999"))

par(op)