Lengths and weights for Bull Trout from two Rocky Mountain lakes and two eras.

Lengths and weights of Bull Trout (Salvelinus confluentis) from two Rocky Mountain lakes in Alberta, CAN and two eras.

Format

A data frame with 137 observations on the following 3 variables:

fl: Fork length (mm)
mass: Wet mass (g)
era: Era of collection (1977-79 and 2001)

Source

From (approximately) Figure 2 of Parker, B.R., D.W. Schindler, F.M. Wilhelm, and D.B. Donald. 2007. Bull trout population responses to reductions in angler effort and retention limits. North American Journal of Fisheries Management 27:848-859. CSV file

Note

The historical (1977-1980) era samples were from before restrictive sportfishing regulatory regimes were implemented (in the 1990s) that led to changes in abundance and population structure of bull trout.

Topic(s)

Weight-Length
Length Frequency

Examples

data(BullTroutRML1)
str(BullTroutRML1)
#> 'data.frame':	137 obs. of  3 variables:
#>  $ fl  : int  90 180 201 346 359 362 373 380 375 396 ...
#>  $ mass: int  11 107 119 587 539 659 719 779 839 755 ...
#>  $ era : Factor w/ 2 levels "1977-79","2001": 1 1 1 1 1 1 1 1 1 1 ...
head(BullTroutRML1)
#>    fl mass     era
#> 1  90   11 1977-79
#> 2 180  107 1977-79
#> 3 201  119 1977-79
#> 4 346  587 1977-79
#> 5 359  539 1977-79
#> 6 362  659 1977-79
op <- par(mfrow=c(1,2),pch=19)
plot(mass~fl,data=BullTroutRML1,subset=era=="1977-79",main="1977-79")
plot(mass~fl,data=BullTroutRML1,subset=era=="2001",main="2001")

par(op)