5.1 . Three-Age-Cohort Model and Fishing
89
INFLOWS:
SHORT_AGE_1_2
(1-SHORT_MORTALITY_O_1)*SHORT_YEAR_O_1
OUTFLOWS :
SHORT_AGE_2_3 = (1-SHORT_MORTALITY_1_2)*SHORT_YEAR_1_2
SHORT_DEATHS_1_2 = SHORT_MORTALITY_1_2*SHORT_YEAR_1_2
SHORT_YEAR_2_3(t) = SHORT_YEAR_2_3(t-dt) +
(SHORT_AGE_2_3-SHORT_DEATHS_2_3) * dt
INIT SHORT_YEAR_2_3 = 6 7
INFLOWS:
SHORT_AGE_2_3 = (1-SHORT_MORTALITY_1_2)*SHORT_YEAR_1_2
OUTFLOWS:
SHORT_DEATHS_2_3 = SHORT_YEAR_2_3
LONG_BIRTH_RATE_1_2 = . 6
LONG_BIRTH_RATE_2_3 = . 8
LONG_MORTALITY_O_1 = .5*TOTAL_POP /20000
LONG_MORTALITY_1_2 = . 3 *TOTAL_ POP / 2 0 0 0 0
LONG_TOTAL_MORTALITY_O_1 =
MIN (LONG_MORTALITY_O_1+MED&LONG_FISHING_MORTALITY, 1)
LONG_TOTAL_MORTALITY_1_2 =
MIN(MED&LONG_FISHING_MORTALITY+LONG_MORTALITY_1_2,1)
MED&LONG_FISHING_MORTALITY = °
MED_BIRTH_RATE_1_2 = .6
MED_BIRTH_RATE_2_3 = . 8
MED_MORTALITY_O_1 = . 5 *TOTAL_ POP/ 2 0 0 0 0
MED_MORTALITY_1_2 = .3 *TOTAL_POP /20000
MED_TOTAL_MORTALITY_O_1 =
MIN (MED_MORTALITY_O_l+MED&LONG_FISHING_MORTALITY , 1)
MED_TOTAL_MORTALITY_1_2 =
MIN (MED_MORTALITY_1_2+MED&LONG_FISHING_MORTALITY, 1)
RAND_LONG_1_2 = RANDOM(O ,l,l)
RAND_LONG_2_3 = RANDOM(O,1,2)
RAND_MED_1_2
RANDOM(O , 1,3)
RAND_MED_2_3 = RANDOM(O,1,4)
RAND_SHORT_1_2 = RANDOM(O,l,5)
RAND_SHORT_2_3 = RANDOM(O,l,6)
SHARE_LONG = TOTAL_LONG_POP /TOTAL_POP
SHARE_MED = TOTAL_MED_POP /TOTAL_POP
SHARE_SHORT = TOTAL_SHORT_POP/TOTAL_POP
SHORT_BIRTH_RATE_1_2 = .6
SHORT_BIRTH_RATE_2_3 = .8
SHORT_MORTALITY_O_1
. 5 *TOTAL_ POP/ 2 0 0 0 0
SHORT_MORTALITY_1_2 = . 3 *TOTAL_ POP/ 2 0 0 0 0