Stock and recruitment data for Lake Whitefish in Thunder Bay, Lake Superior, 1975-1988.

Lake Whitefish (Coregonus clupeaformis) stock, recruitment, landings, and fishing mortality by year, 1975-1988.

Format

A data frame of 14 observations on the following 5 variables:

year: Year of data
ssb: Spawning stock biomass (in tonnes)
rec: Recruits (in thousands)
land: Landings (in tonnes)
fmort: Fishing related mortality (natural mortality was assumed to be 0.3)

Source

From Petzold, M. 1995. An historical analysis of the Lake Whitefish fisheries of Thunder Bay (Zone 1) and Whitefish Bay (Zone 34), Lake Superior. Ontario Min. of Nat. Res. unpubl. manuscript. Obtained from Ransom Myers old online database. CSV file

Topic(s)

Stock-Recruit
Recruitment

Examples

data(WhitefishTB)
str(WhitefishTB)
#> 'data.frame':	14 obs. of  5 variables:
#>  $ year : int  1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 ...
#>  $ ssb  : num  33.4 26.2 30.4 37.9 35.2 ...
#>  $ rec  : num  112.7 92.7 127.9 109.9 226.7 ...
#>  $ land : num  19.8 8.5 12.4 20.5 16.7 15.2 30.5 22.3 18.6 22.3 ...
#>  $ fmort: num  0.7 0.283 0.535 0.817 1.367 ...
head(WhitefishTB)
#>   year  ssb   rec land   fmort
#> 1 1975 33.4 112.7 19.8 0.70026
#> 2 1976 26.2  92.7  8.5 0.28319
#> 3 1977 30.4 127.9 12.4 0.53457
#> 4 1978 37.9 109.9 20.5 0.81698
#> 5 1979 35.2 226.7 16.7 1.36712
#> 6 1980 77.2 489.2 15.2 0.39416
op <- par(mfrow=c(1,2),pch=19)
plot(rec~year,data=WhitefishTB,type="b")
plot(rec~ssb,data=WhitefishTB)

par(op)