338
14. Dynamics of Multiple Fish Species
Effort_cod_20 = Effort_Cod_R2*fraction_cod_9
Effort_cod_21
fraction_cod_10*Effort_Cod_R2
Effort Cod R2
Effort_to_R2 *Fraction_Cod_R2
F_cod_11 = cod_1_#_caught_2 /Cod2 _Age_1
F_cod_12
cod_2_#_caught_2 /Cod2_Age_2
F_cod_13
cod_3_#_caught_2 /Cod2_Age_3
F_cod_14
cod_4_#_caught_ 2 /Cod2_Age_4
F_cod_15
cod_5_#_caught_ 2 /Cod2 _Age_5
F_cod_16
cod_6_#_caught_2 /Cod2_Age_6
F_cod_17
cod_7_#_caught_2 /Cod2_Age_7
F_cod_18
cod_8#_caught_2 /Cod2 _Age_8
F_cod_19
cod_9_#_caught_2 /Cod2_Age_9
F_cod_20 = cod_10_#_caught_2 /Cod2 _Age10Plus
Ec o nMo du l e
CPVP(t ) = CPVP(t-dt) + (PVP)
INIT CPVP = °
* dt
else If (TIME
Else if
5 and TIME < 10) then (-E * .l)
and
200000) then E_DOT2 Else 0
INFLOWS:
PVP = CVP*EXP(-Interest_Rate *TIME)
E(t)
E(t-dt) + (E_DOT) * dt
INIT E = 100000{days fished, total flee t}
INFLOWS :
E_DOT = If (TIME <5 ) then E_DOT2
* (ALPHA*E* (Price *Catchability_coefficient*Total_GB_Biom
ass-Cost)*CVP)
ALPHA = 0.000007 {$ /Ton /time}
Cost = 50000
CVP =
E*(Price*Catchability_coefficient*Total_GB_BiomassCost)
E_DOT2 = ALPHA*(CVP-DEL AY(CVP,l,O»
Interest_Rate = .04
Price = 1077.4656 {$ per ton}
total_ cost = E*Cost
total_revenues =
Total_GB_Biomass*E *Catchability_coefficient*Price