Bangus Farm Blueprints

Pond layout, aerator placement, and feeding zone maps — Paombong, Bulacan

Total Area45,000 m² (Box A 34,000 + Box B 11,000)
Stocking20,000/ha × 4.5 ha = 90,000 fingerlings
TrialBox A control · Box B probiotics
Stocking DateJune 1–3, 2026

Map 1 — Pond Layout (Full 45,000 m²)

Top-down view showing Box A and Box B boundaries, dike system, water inlet/outlet, and house location. Pond shape traced from Google Earth measurement (1.02 km perimeter, 44,176 m² total).

↑ NORTH BOX A CONTROL (no probiotics) 34,000 m² · 3.4 ha 68,000 fingerlings ~700m N–S × ~500m E–W INTERNAL DIKE BOX B PROBIOTIC 11,000 m² · 1.1 ha · 22,000 fingerlings SLUICE inlet/drain SLUICE B HOUSE Power source power cable SCALE 0 100m 200m N ~500m E–W along north dike OUTER DIKE — bamboo + soil (adjacent fishponds) (river / waterway south)
ParameterBox A (Control)Box B (Probiotic)Total
Area34,000 m² (3.4 ha)11,000 m² (1.1 ha)45,000 m² (4.5 ha)
Fingerlings stocked68,00022,00090,000
Density (per ha)20,000/ha20,000/ha20,000/ha (identical — required for trial validity)
Aerator units4 (1 venturi + 3 floating)2 (1 venturi + 1 floating)6 total
Aerator density (units/ha)1.18 units/ha1.82 units/ha—
Estimated installed HP~6.6 HP (1 venturi 1HP + 3 floating 1800W)~3.4 HP (1 venturi 1HP + 1 floating 1800W)~10 HP total
HP per ha~1.94 HP/ha~3.09 HP/ha—
Experimental design flag: Box B has 60% more aerator units per hectare than Box A (1.82 vs 1.18 units/ha) and 59% more HP per hectare (3.09 vs 1.94 HP/ha). When interpreting trial results, any improvement in Box B over Box A will be a combined effect of probiotics + better aeration, not probiotics alone. See Section 4.1 of the main plan for the recommended mitigation (Pathway A).

Map 2A — Box A Aerator Placement (Control · 3.4 ha)

1 venturi pump (front dike near house) + 3 floating aerators spaced for circular water flow. All wiring runs along outer dike to a central IP65 panel near the house.

BOX A — 34,000 m² / 3.4 ha / 68,000 fingerlings CONTROL — no probiotics in pond or feed PANEL BOX A IP65 · house wall V1 2" PVC venturi manifold — 4 nozzles · ~60m run F1 (1800W) NW quadrant F2 (1800W) center pond F3 (1800W) NE quadrant circular water flow ↻ ~12m to V1 ~360m to F1 ~370m to F2 ~510m to F3 N

Box A — Cable Run Schedule

RunFromToLengthCable sizeConduit
A-1Panel (house wall)V1 — venturi pump~12 m3×3.5 mm² THHN3/4" PVC, buried 30cm in dike or zip-tied to bamboo posts at 1.5m height
A-2PanelF1 — floating aerator NW~360 m (along W dike, then bamboo float-cable across)3×3.5 mm² THHN3/4" PVC on dike + IP68 marine cable from dike-anchor to float (last 50m)
A-3PanelF2 — floating aerator center~370 m (along S dike, then float-cable)3×3.5 mm² THHNsame as A-2
A-4PanelF3 — floating aerator NE~510 m (along S then E dike, then float-cable)3×3.5 mm² THHNsame as A-2
Total wire (per cable size)~1,252 m3-core 3.5 mm² THHN, add 10% for cuts/waste = ~1,380 m

Box A — Weatherproofing Specs

ItemSpecRationale
Panel box (Box A)IP65, 300 × 200 × 150 mm, polycarbonateHouses 4 × ELCB (30 mA, 25 A double-pole) + 1 main breaker. Sized for 4 future expansion slots.
Cable type — dike runsTHHN 3×3.5 mm² (12 AWG), wet-rated, in PVC conduitResists UV + salt spray. Conduit gives mechanical protection from rats/heron stakes/grass cutting.
Cable type — float dropIP68 marine cable, double-jacket, 3-core 2.5 mm²Last 30–50 m from dike edge to floating unit must survive full submersion if float capsizes.
Junction box on dikeIP66 outdoor, mounted on bamboo post 1.5 m above flood lineSplice point between THHN (dike) and marine cable (float). Must stay dry during high-tide events (1.03 m chart datum max).
Cable glandsPG16 weatherproof, brassSealed entry to panel + junction boxes — no exposed wire entries.
Conduit fastenerUV-stable nylon zip ties + bamboo stakes every 2 mNo metal — corrosion-free.
Earth grounding2 m copper rod, driven into dike soil at panelBonded to all metal pump bodies. ELCB will not function without earth ground.
Float anchorBamboo pole 3 m driven into pond bottom + 8 mm nylon ropeFloat adjusts to water level; rope has 1 m slack for ±90 cm tidal variation.
Aerator positioning logic (Box A): Each 1800W floating aerator covers a ~70 m radius of effective oxygenation in a semi-intensive pond. With 3 units spaced in a triangle pattern (NW, center, NE) and the venturi manifold on the south dike, every point of Box A is within 80 m of an active aerator. The water flow generated by F1+F2+F3 creates a clockwise circulation that pushes the venturi-injected oxygen from the south dike into the center where most fish congregate.

Map 2B — Box B Aerator Placement (Probiotic · 1.1 ha)

1 venturi pump + 1 floating aerator. Smaller pond, but flagged for additional aerator purchase before Cycle 2 (see Section 4.2 of main plan).

BOX B — 11,000 m² / 1.1 ha / 22,000 fingerlings PROBIOTIC TREATMENT — UPLB Immunodefence Aqua SHARED DIKE → BOX A PANEL B IP65 sub-panel V2 2" PVC venturi manifold — 4 nozzles · ~50m run F4 (1800W) center · self-floating flow path ~6m ~300m to F4 F5? future Cycle 2 unit (recommended) N

Box B — Cable Run Schedule

RunFromToLengthCable size
B-1Panel B (sub-panel on shared dike)V2 — venturi pump~6 m3×3.5 mm² THHN in 3/4" PVC
B-2Panel BF4 — floating aerator center~300 m (dike + float drop 30 m IP68)3×3.5 mm² THHN main + 3×2.5 mm² IP68 marine to float
B-3 (feed)Panel A (house) → Panel B (sub)Inter-pond feed cable~180 m3×5.5 mm² THHN (larger to handle voltage drop)
Total wire~486 madd 10% = ~535 m
Aeration shortfall warning: Box B at 1.1 ha with only 2 aerator units = 3.09 HP/ha installed capacity. SEAFDEC intensive guidelines suggest 5+ HP/ha for biomass over 4,000 kg/ha. Box B's biomass at harvest will hit ~7,040 kg/ha (22,000 fish × 400g ÷ 1.1 ha) — which is 75% above the no-aeration ceiling and right at the limit of the current setup. Pre-dawn DO monitoring in Box B is mandatory from Day 60 onward. Reserve budget for 1 more 1800W floating aerator (~₱8,000) to add before Cycle 2.

Map 3 — Optimal Feeding Zones

Feeding zones placed UPSTREAM of aerator flow so feed pellets disperse over oxygenated water, not stagnant zones. Fish congregate near aerators — feed near (not on top of) them.

F1 F2 F3 V1 manifold FZ-A1 7:00 AM FZ-A2 7:00 AM + 3:00 PM FZ-A3 3:00 PM BOX A — 3 Feeding Zones Rotate zones between feedings · 7 AM = upcurrent of F1/F2 · 3 PM = downwind F4 FZ-B1 7:00 AM FZ-B2 3:00 PM BOX B — 2 Feeding Zones N Feeding Zone (FZ) — 20m radius, broadcast cast from dike or banca Aerator position (F1–F4)

Feeding Time Logic — Why These Zones

TimeDO stateZone choiceReason
4:00–6:00 AMDANGER — DO at daily minimum (2–4 mg/L)DO NOT FEEDAdding feed at low DO = ammonia spike + uneaten feed rotting in low-oxygen water. Wait for sunrise photosynthesis to lift DO above 5 mg/L.
7:00–8:00 AMRECOVERING — DO climbing past 5 mg/LFZ-A1 / FZ-A2 / FZ-B1 (upwind of aerators)Feed disperses across freshly oxygenated water; fish are hungriest after the overnight fast.
11:00 AMRISING — DO 6–8 mg/L (photosynthesis active)(skip — twice daily plan)Only feed if fish were observed under-eating in AM (sampling check).
3:00–4:00 PMPEAK — DO 8–12 mg/LFZ-A2 / FZ-A3 / FZ-B2 (rotate from AM zones)Highest DO of the day = best feed conversion. Rotating zone prevents fecal/feed buildup in any one spot.
6:00 PM onwardDECLINING — sunset reverses photosynthesisDO NOT FEEDNight respiration begins drawing DO down. Stop feeding at least 2 hours before sunset (~5 PM).
Box A coverage: 3 feeding zones across 3.4 ha = 1 zone per 1.13 ha. Rotation: 7 AM = FZ-A1 + FZ-A2; 3 PM = FZ-A2 + FZ-A3. FZ-A2 (center) feeds twice because that's where F2 keeps DO highest mid-day.

Box B coverage: 2 feeding zones across 1.1 ha = 1 zone per 0.55 ha. Each zone is fed once per day, alternating. Both zones are within 30 m of F4 to keep fish in well-oxygenated water during digestion.
Feeding execution rules (apply to both boxes):
  • Broadcast feed by hand from dike or small banca — never dump in one spot
  • Spread the daily ration across 15 minutes of slow broadcast — not 1 minute
  • Watch the water surface — if uneaten feed visible after 15 mins, reduce next feeding by 10%
  • Box B feed mix (probiotics): 12 cc Immunodefence Aqua + 1 kg dry pellet, mix fresh in plastic basin, use within 20 minutes (per UPLB instruction)
  • Box A feed: identical pellets, identical schedule — but NO probiotic additive (control condition)
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