Norwegian cod (Gadus morhua) stock and recruitment by year, 1937-1960.
A data frame of 24 observations on the following 3 variables:
Year of data
Recruits -- year-class strength index
Spawning stock index
From Garrod, D.J. 1967. Population dynamics of the Arcto-Norwegian cod. Journal of the Fisheries Research Board of Canada, 24:145-190.
Stock-Recruit
Recruitment
Used in srStarts
, srFuns
, and nlsTracePlot
examples.
str(CodNorwegian)#> 'data.frame': 24 obs. of 3 variables: #> $ year : int 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 ... #> $ recruits: int 146 31 17 26 43 58 113 75 99 70 ... #> $ stock : int 118 164 180 172 151 139 122 114 139 140 ...head(CodNorwegian)#> year recruits stock #> 1 1937 146 118 #> 2 1938 31 164 #> 3 1939 17 180 #> 4 1940 26 172 #> 5 1941 43 151 #> 6 1942 58 139op <- par(mfrow=c(1,2),pch=19,mar=c(3,3,0.5,0.5),mgp=c(1.9,0.5,0),tcl=-0.2) plot(recruits~year,data=CodNorwegian,type="l") plot(recruits~stock,data=CodNorwegian)par(op)