328
14. Dynamics of Multiple Fish Species
MULTISPECIES MODEL
2
Cod Rl
Cod1_Age10Plus(t) = Cod1_Age10Plus(t-dt) + (Cod_Out_9Cod_Out_10plus-CN_102) * dt
INIT Cod1_Age10Plus = 42 .35
INFLOWS:
Cod_Out_9 = Cod1_Age_9*(1-Z_Cod_9)
OUTFLOWS:
Cod_Out_10plus = Cod1_Age10Plus*Cod_10_Die
CN_102 = ffi_C10*PC10_12*(Cod1_Age10Plus+Cod2_Age10Plus)
Cod1_Age3(t) = Cod1_Age3(t-dt) + (Cod_Out_2-Cod_Out_3Cod_Die_3-CN_32) * dt
INIT Cod1_Age3 = 6401.35
INFLOWS:
Cod_Out_2
OUTFLOWS :
Cod_1_Age_2*(1-Z_Cod_2)
Cod_Out_3 = Cod1_Age3*(1-Z_Cod_3)
Cod_Die_3 = Cod1_Age3*Z_Cod_3
CN_32 = ffi_C3*PC3_12*(Cod1_Age3+Cod2_Age_3)
Cod1_Age4(t) = Cod1_Age4(t-dt) + (Cod_Out_3-Cod_Out_4Cod_Die_4-CN_42) * dt
INIT Codl_Age4 = 2450 .55
INFLOWS :
Cod_Out_3
OUTFLOWS :
Cod_Out_4
Cod_Die_4
Cod1_Age3*(1-Z_Cod_3)
Cod1_Age4*(1-Z_Cod_4)
Cod1_Age4*Z_Cod_4
CN_42 = ffi_C4*PC4_12*(Cod1_Age4+Cod2_Age_4)
Cod1_Age5(t) = Cod1_Age5(t-dt) + (Cod_Out_4-Cod_Out_5Cod_Die_5-CN_52) * dt
INIT Cod1_Age5 = 2367.55
INFLOWS:
Cod_Out_4
20 nly the main components of COD MODULE are shown here . The full set of equations is on the CD ROM accompanying this book. The structure of the modules
dealing with pollock and haddock populations is similar to that for Cod.