13.5. Questions and Tasks
285
NP_mass[17] (t) = NP_mass[17] (t-dt) + (Growth[17]NP_mortality[17]-Reproduction[17]) * dt
INIT NP_mass[17] = 0
NP_mass[18] (t) = NP_mass[18] (t-dt) + (Growth[18]NP_mortality[18]-Reproduction[18]) * dt
INIT NP_mass[18] = 0
NP_mass[19] (t) = NP_mass[19] (t-dt) + (Growth[19]NP_mortality[19]-Reproduction[19]) * dt
INIT NP_mass[19] = 0
NP_mass[20] (t) = NP_mass[20] (t-dt) + (Growth[20]NP_mortality[20]-Reproduction[20]) * dt
INIT NP_mass[20] = 0
INFLOWS:
Growth [Cohorts]
(((growth_haps[Cohorts]*haps[Cohorts])+(growth_other[C0
horts]*summary[Cohorts]))*NP_mass[Cohorts])+births[Coho
rts]
OUTFLOWS:
NP_mortality[Cohorts]
IF((fished_mortality[Cohorts]+Nat_mort_mass[Cohorts]+(s
eine_mortality[Cohorts]))>NP_mass[Cohorts]) THEN
(NP_mass[Cohorts]) ELSE
(fished_mortality [Cohorts]+Nat_mort_mass [Cohorts]+(sein
e_mortality[Cohorts])) {total mass of fish killed per
cohort per day}
Reproduction [Cohorts] =
IF (Fishwt[Cohorts]>size_at_maturity) {size
approximating age at maturity}
THEN (NP_mass [Cohorts] *spawning) ELSE 0 {biomass
spawned}
NP_number[l] (t) = NP_number[l] (t-dt) + (born[l]NP_mort[l]) * dt
INIT NP_number[l] = 1000
NP_number[2] (t) = NP_number[2] (t-dt) + (born[2]NP_mort[2]) * dt
INIT NP_number[2] = 0