88
5. Impact of Fishing Pressure on Mean Length of Fish
OUTFLOWS :
MED_AGE_1_2 = (1-MED_TOTAL_MORTALITY_O_1)*MED_YEAR_O_1
MED_DEATHS_O_1 = MED_TOTAL_MORTALITY_O_1*MED_YEAR_O_1
MED_YEAR_1_2(t) = MED_YEAR_1_2(t-dt) + (MED_AGE_1_2MED_AGE_2_3-MED_DEATHS_1_2) * dt
INIT MED_YEAR_1_2 = 76
INFLOWS:
MED_AGE_1_2
(1-MED_TOTAL_MORTALITY_O_1)*MED_YEAR_O_1
OUTFLOWS :
MED_AGE_2_3 = (1-MED_TOTAL_MORTALITY_1_2)*MED_YEAR_1_2
MED_DEATHS_1_2 = MED_TOTAL_MORTALITY_1_2*MED_YEAR_1_2
MED_YEAR_2_3(t) = MED_YEAR_2_3(t-dt) + (MED_AGE_2_3MED_DEATHS_2_3) * dt
INIT MED_YEAR_2_3 = 67
INFLOWS:
MED_AGE_2_3 = (1-MED_TOTAL_MORTALITY_1_2)*MED_YEAR_1_2
OUTFLOWS:
MED_DEATHS_2_3 = MED_YEAR_2_3
SHORT_YEAR_O_1(t) = SHORT_YEAR_O_1(t-dt) +
(SHORT_BIRTHS-SHORT_AGE_1_2-SHORT_DEATHS_O_1) * dt
INIT SHORT_YEAR_O_1 = 100
INFLOWS :
SHORT_BIRTHS
SHORT_BIRTH_RATE_1_2*RAND_SHORT 1 2*SHORT_YEAR 1 2
+SHORT_BIRTH_RATE_2_3*RAND_SHORT_2_3*SHORT_YEAR_2_3
+MED_BIRTH_RATE_1_2* .5* (1-RAND_MED_1_2) *MED_YEAR_1_2
+MED_BIRTH_RATE_2_3* .5* (1-RAND_MED_2_3) *MED_YEAR_2_3
+LONG_BIRTH_RATE_1_2*(1 /3)*(1RAND_LONG_1_2) *LONG_YEAR_1_2
+LONG_BIRTH_RATE_2_3*(1 /3)*(1RAND_LONG_2_3) *LONG_YEAR_2_3
OUTFLOWS:
SHORT_AGE_1_2 = (1-SHORT_MORTALITY_O_1)*SHORT_YEAR_O_1
SHORT_DEATHS_O_1 = SHORT_MORTALITY_O_1*SHORT_YEAR_O_1
SHORT_YEAR_1_2(t) = SHORT_YEAR_1_2(t-dt) +
(SHORT_AGE_1_2-SHORT_AGE_2_3-SHORT_DEATHS_1_2) * dt
INIT SHORT_YEAR_1_2 = 76