calc_SSB: Calculate Spawning Stock Biomass (SSB) or total biomass
In LeMaRns: Length-Based Multispecies Analysis by Numerical Simulation

Description Usage Arguments Details Value See Also Examples

Calculates the spawning stock biomass (SSB) or total biomass of each species in the model.

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calc_SSB(wgt, mature, N)

calc_biomass(wgt, N)

`wgt`	A matrix with dimensions `nsc` and `nfish` representing the weight of each species in each length class.
`mature`	A matrix with dimensions `ncs` and `nfish` with elements in the range 0-1 representing the proportion of mature individuals of each species in each length class.
`N`	A matrix with dimensions `nsc` and `nfish` representing the number of individuals in each length class for the current time step.

The Spawning Stock Biomass is equal to colSums(mature*N*wgt) and the total biomass is equal to colSums(mature*N*wgt).

calc_SSB returns a numeric vector of length nfish representing the SSB of each species (g).

calc_biomass returns a numeric vector of length length(species) where the jth element is the biomass (g) of the jth species.

calc_recruits

# Set up and run the model
NS_params <- LeMansParam(NS_par, tau=NS_tau, eta=rep(0.25, 21), L50=NS_par$Lmat, other=1e12)
effort <- matrix(0.5, 10, dim(NS_params@Qs)[3])
model_run <- run_LeMans(NS_params, years=10, effort=effort)

# Calculate SSB
calc_SSB(wgt=NS_params@wgt, mature=NS_params@mature, N=model_run@N[,,101])

# Calculate biomass in the last time step
calc_biomass(wgt=NS_params@wgt, N=model_run@N[,,101])