17.9. Qu estion s and Tasks
391
INFLOWS:
ENHANCEMENT
OUTFLOWS:
(IN SECTOR: HATCHERY)
TO_JW_2 = HAT_AGE_l-DIE_HAT_AGE_ l
DIE_HAT_AGE_l = HAT_AGE_l *MORT_AGE_l
JW_AGE_2(t) = JW_AGE_2 ( t-dt) + (TO_JW_2 +
NAT_TO_JW_2-DIE_ AGE_2-TO_MATURE ) * dt
INIT JW_AGE_2 = 0
INFLOWS:
TO_JW_2 = HAT_AGE_I-DIE_HAT_AGE_l
NAT_TO_JW_2 = NAT_AGE_I-DIE_NAT_AGE_l
OUTFLOWS:
DIE_AGE_2 = JW_AGE_2*MORT_AGE_2
TO_MATURE = JW_AGE_2-DIE_AGE_2
LIVE_EGGS(t) = LIVE_EGGS(t-dt) + (SPAWN-TO_NAT_AGE_ODIE_EGGS) * dt
INIT LIVE_EGGS = 0
INFLOWS:
SPAWN =
EGGS_AT_AGE [AGE_3 _TO_4]+EGGS_AT_AGE[AGE_4_TO_5] +EGGS_AT
_AGE [AGE_5_TO_6 ]+EGGS_AT_AGE [AGE_ 6_ TO_ 7 ] +EGGS_AT_AGE[AG
E_7 _ TO_8]+EGGS_AT_AGE [AGE_8_TO_9] +EGGS_AT_AGE[AGE_9_TO_
l O]+EGGS_ AT_ AGE[AGE_IO_ PLUS]
OUTFLOWS:
TO_ NAT_AGE_O = LIVE_E GGS-D IE_EGGS
DIE_EGG S = LIVE_EGGS*EGG_MORT
MATURE_FISH [Year_Class] (t) = MATURE_FISH [Yea r_Class] ( t -
dt ) + (INTO_YEAR_CLASS[ Year_Class] -CATCH[ Yea r_Class]DIE_MATURES[ Yea r_Class]- EMIGRATION[Year_Class ]OUT_ OF_YEAR_ CLASS [Year_Class] ) * dt
INIT MATURE_FISH[Year_ Cl ass] = 0
INFLOWS:
INTO_YEAR_CLASS[ AGE_3_TO_4] =
TO_MATURE+OUT_OF_YEAR_CLASS[AGE_3_TO_4]*0
INTO_YEAR_CLASS [AGE_4_TO_5] =
OUT_OF_ YEAR_CLASS [AGE_ 3_TO_ 4 ] +TO_ MATURE*O
INTO_ YEAR_CLASS[ AGE_5_TO_ 6 ] =
OUT_OF_ YEAR_CLASS [AGE_4_TO_5 ]+TO_MATURE *O
INTO_YEAR_CLASS[ AGE_6_T O_ 7] =
OUT_ OF_YEAR_CLASS [AGE_5_TO_6]+TO_MATURE * O