Calculates the yield for a population.
ypr_yield(object, Ly = 0, harvest = TRUE, biomass = FALSE, ...)The population or populations.
The minimum length (trophy) fish to consider when calculating the yield (cm).
A flag specifying whether to calculate the yield for harvested fish or captures.
A flag specifying whether to calculate the yield in terms of the biomass versus number of individuals.
Unused parameters.
The yield as number of fish or biomass.
By default, with Rmax = 1 the number of individuals is the proportion of
the recruits at the carrying capacity. If the yield is given in terms of the
biomass (kg) then the scaling also depends on the value of Wa (g).
Other yield:
ypr_plot_yield(),
ypr_tabulate_yield(),
ypr_yields()
Other calculate:
ypr_age_at_length(),
ypr_exploitation(),
ypr_length_at_age(),
ypr_optimize(),
ypr_yields()
ypr_yield(ypr_population())
#> [1] 0.04220691
#> attr(,"Age")
#> [1] 6.7687
#> attr(,"Length")
#> [1] 62.13068
#> attr(,"Weight")
#> [1] 2580.272
#> attr(,"Effort")
#> [1] 2.117905
ypr_yield(ypr_ecotypes(Linf = c(100, 200)))
#> [1] 0
#> attr(,"Age")
#> [1] NA
#> attr(,"Length")
#> [1] NA
#> attr(,"Weight")
#> [1] NA
#> attr(,"Effort")
#> [1] 2.117905