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Computes the fishing mortality at age (harvest) associated with either landings (Fwanted) or discards (Funwanted) through the respective proportions at age. The function names reflect the convention used in ICES.

Usage

Funwanted(x, ages = dimnames(x)$age)

Arguments

x

An FLStock object, with harvest

ages

Ages over which the respective Fbar calculation applies

Value

An FLQuant

Examples

data(ple4)
Fwanted(ple4, ages=2:6)
#> An object of class "FLQuant"
#> , , unit = unique, season = all, area = unique
#> 
#>      year
#> age   1957     1958     1959     1960     1961     1962     1963     1964    
#>   all 0.201805 0.203262 0.197168 0.238148 0.219695 0.212611 0.228665 0.251027
#>      year
#> age   1965     1966     1967     1968     1969     1970     1971     1972    
#>   all 0.274959 0.227080 0.201600 0.224142 0.264587 0.265615 0.276443 0.321151
#>      year
#> age   1973     1974     1975     1976     1977     1978     1979     1980    
#>   all 0.400059 0.401399 0.303873 0.314124 0.293176 0.370529 0.382088 0.476831
#>      year
#> age   1981     1982     1983     1984     1985     1986     1987     1988    
#>   all 0.475766 0.448737 0.417565 0.395911 0.459501 0.451228 0.443920 0.392033
#>      year
#> age   1989     1990     1991     1992     1993     1994     1995     1996    
#>   all 0.406081 0.427528 0.413501 0.425600 0.483390 0.506513 0.521262 0.515784
#>      year
#> age   1997     1998     1999     2000     2001     2002     2003     2004    
#>   all 0.500955 0.432935 0.415823 0.419608 0.301144 0.395703 0.353625 0.299551
#>      year
#> age   2005     2006     2007     2008     2009     2010     2011     2012    
#>   all 0.205637 0.198040 0.157318 0.159873 0.128586 0.116353 0.106405 0.111273
#>      year
#> age   2013     2014     2015     2016     2017    
#>   all 0.121725 0.095258 0.098437 0.093188 0.092754
#> 
#> units:  f 
Funwanted(ple4, ages=1:3)
#> An object of class "FLQuant"
#> , , unit = unique, season = all, area = unique
#> 
#>      year
#> age   1957    1958    1959    1960    1961    1962    1963    1964    1965   
#>   all 0.09506 0.15374 0.18568 0.18006 0.21372 0.21149 0.24130 0.20943 0.19850
#>      year
#> age   1966    1967    1968    1969    1970    1971    1972    1973    1974   
#>   all 0.21569 0.20137 0.19693 0.18563 0.21370 0.20436 0.17391 0.14681 0.20536
#>      year
#> age   1975    1976    1977    1978    1979    1980    1981    1982    1983   
#>   all 0.33311 0.29054 0.31343 0.28453 0.29193 0.18805 0.17612 0.20023 0.24281
#>      year
#> age   1984    1985    1986    1987    1988    1989    1990    1991    1992   
#>   all 0.25025 0.25419 0.28203 0.37235 0.38371 0.35276 0.32278 0.31714 0.30323
#>      year
#> age   1993    1994    1995    1996    1997    1998    1999    2000    2001   
#>   all 0.24985 0.20708 0.16979 0.23412 0.38735 0.40383 0.30329 0.24894 0.29975
#>      year
#> age   2002    2003    2004    2005    2006    2007    2008    2009    2010   
#>   all 0.33329 0.35325 0.31981 0.29025 0.25768 0.24099 0.19469 0.18102 0.15655
#>      year
#> age   2011    2012    2013    2014    2015    2016    2017   
#>   all 0.14002 0.14605 0.15107 0.17550 0.18162 0.16361 0.14140
#> 
#> units:  f