37.2 Gizzard Shad Model Equations
ADULT(t) ¼ ADULT(t À dt) + (YEARLING_GROW À ADULT_GROW À
ADULT_DIE) * dt
INIT ADULT ¼ 100 {Individuals}
INFLOWS:
YEARLING_GROW ¼ PULSE(YEARLING,7,52) {Individuals per Week}
OUTFLOWS:
ADULT_GROW ¼ ADULT * ADULT_GROWTH {Individuals per Week}
ADULT_DIE ¼ IF ADULT <1 THEN 0 ELSE (ADULT * SIZE_RATE_5)
+WINTERKILL_5 {Individuals per Week}
ALGAE(t) ¼ ALGAE(t À dt) + (ALGAE_GROWTH_2 À CONSUMPTION_ZOOP)
* dt
INIT ALGAE ¼ 10000 {Units of Biomass}
INFLOWS:
ALGAE_GROWTH_2 ¼ GROWTH_ALGAE {Units of Biomass per Week}
OUTFLOWS:
CONSUMPTION_ZOOP ¼ (ALGAE * CONSUMPTION_RATE_ZOOP) {Units of
Biomass per Week}
EARLY_JUV(t) ¼ EARLY_JUV(t À dt) + (LARVAE_GROW À EARLY_JUV_GROW
À EARLY_JUV_DIE) * dt
INIT EARLY_JUV ¼ 100 {Individuals}
INFLOWS:
LARVAE_GROW ¼ LARVAL * LARVAL_GROWTH {Individuals per Week}
OUTFLOWS:
Fig. 37.20
37.2 Gizzard Shad Model Equations
343