Calculates the yield for a population.
Arguments
- object
The population or populations.
- Ly
The minimum length (trophy) fish to consider when calculating the yield (cm).
- harvest
A flag specifying whether to calculate the yield for harvested fish or captures.
- biomass
A flag specifying whether to calculate the yield in terms of the biomass versus number of individuals.
- ...
Unused parameters.
Details
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).
See also
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()
Examples
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