Returns the computed yearly production
Arguments
- object
An object with biomass and catch data.
- what
One of the production options: "ssb", "biomass", or "exploitation".
Details
Production can be calculated for an FLStock based on the spawning stock biomass ("ssb"), total biomass ("biomass"), or exploitation ("exploitation").
Examples
data(ple4)
# For SSB
production(ple4, "ssb")
#> An object of class "FLQuant"
#> , , unit = unique, season = all, area = unique
#>
#> year
#> age 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966
#> all 91512 95530 123119 129308 210400 84703 130632 100648 172340 231689
#> year
#> age 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976
#> all 139513 93708 113785 127757 145745 85625 147244 161657 192360 176272
#> year
#> age 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986
#> all 164270 152893 189471 156381 177925 247466 240644 255680 260378 342209
#> year
#> age 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996
#> all 262223 338779 240262 211093 172667 161222 133093 139970 113817 133277
#> year
#> age 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006
#> all 185109 152527 182415 149306 115799 170217 139195 160315 145261 120747
#> year
#> age 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016
#> all 183276 194586 216921 140039 161798 224281 254384 90631 199634 208053
#> year
#> age 2017
#> all NA
#>
#> units: t
# For total biomass
production(ple4, "biomass")
#> An object of class "FLQuant"
#> , , unit = unique, season = all, area = unique
#>
#> year
#> age 1957 1958 1959 1960 1961 1962 1963 1964
#> all 97057.5 124335.9 134193.7 131624.1 195830.9 84314.2 156283.4 106620.6
#> year
#> age 1965 1966 1967 1968 1969 1970 1971 1972
#> all 184772.0 168397.4 135624.4 103680.5 116318.4 135301.9 137680.9 98870.1
#> year
#> age 1973 1974 1975 1976 1977 1978 1979 1980
#> all 177708.0 199229.7 182733.9 171714.1 160913.2 160718.4 182691.4 144393.8
#> year
#> age 1981 1982 1983 1984 1985 1986 1987 1988
#> all 236823.4 256090.8 250806.2 257466.2 367166.4 307643.1 241038.8 255692.8
#> year
#> age 1989 1990 1991 1992 1993 1994 1995 1996
#> all 216385.9 200280.0 151334.7 142125.9 122293.1 150908.2 118295.2 198090.3
#> year
#> age 1997 1998 1999 2000 2001 2002 2003 2004
#> all 158178.3 143119.1 145741.4 159858.4 160431.2 150072.8 156416.2 123678.8
#> year
#> age 2005 2006 2007 2008 2009 2010 2011 2012
#> all 164460.6 123874.2 198506.5 214558.2 221034.4 134974.6 172571.2 232425.2
#> year
#> age 2013 2014 2015 2016 2017
#> all 263438.5 3241.5 198078.0 219445.0 NA
#>
#> units: t