5.1. Three-Age-Cohort Model and Fishing
87
OUTFLOWS :
LONG_AGE_ 1_ 2 = (1 -
LONG_TOTAL_MORTALITY_O_1 ) *LONG_YEAR_O_1
LONG_DEATHS_O_1 =
LONG_TOTAL_M ORTAL IT Y_O_1 *LONG_YEAR_O_1
LONG_YEAR_ 1_2( t) = LONG_YEAR_l_2 (t-dt ) + (LONG_ AGE_1 _ 2 -
LONG_AGE_2_3-LONG_DEATHS_ l _ 2 ) * dt
I NIT LONG_YEAR_1_ 2 = 7 6
INFLOWS:
LONG_AGE_1_2 = (1LONG_TOTAL_MORTALITY_O_l) *LONG_YEAR_O_l
OUTFLOWS:
LONG_AGE_2_3 = (1 -
LONG_TOTAL_MORTALITY_1_2) *LONG_YEAR_1_2
LONG_DEATHS_1_ 2 =
LONG_TOTAL_MORTALITY_1_ 2 *LONG_YEAR_1_2
LONG_YEAR_2_3(t)
LONG_YEAR_2_3(t-dt) + (LONG_AGE_2_3LONG_DEATHS_2_3 ) * d t
INIT LONG_YEAR_ 2_3 = 67
I NFLOWS :
LONG_AGE_2_3 = (1 -
LONG_TOTAL_MORTALITY_1_2 ) *LONG_YEAR_l_2
OUTFLOWS :
LONG_DEATHS_ 2_3 = LONG_YEAR_2 _3
MED_YEAR_ O_1( t) = MED_YEAR_O_1 (t-dt ) + (MED_BI RTHSMED_AGE_1_2-MED_DEATHS_O_1 ) * d t
INIT MED_YEAR_O_ 1 = 100
I NFLOWS :
MED_BIRTHS
MED_BIRTH_RATE_1_2 *RAND MED 1 2 *MED YEAR 1 2
+MED_BIRTH_RATE_2_3 *RAND_MED_2_3*MED_YEAR_2_3
+SHORT_BIRTH_RATE_1_2 *( 2 /3 )*(1RAND_SHORT_1_2) *SHORT_YEAR_1_ 2
+SHORT_BIRTH_RATE_2_3 *( 2 / 3) *(1RAND_SHORT_2_3 ) *SHORT_YEAR_2_ 3
+LONG_BIRTH_RATE_1_2 *( 2 /3) * (1 -
RAND_LONG_1_2) *LONG_YEAR_1 _2
+LONG_BIRTH_RATE_2_3 * (2 / 3) * (1 -
RAND_LONG_2_3 ) *LONG_YEAR_ 2_ 3