Grow-out ponds: 4 × (60 m × 50 m × 1.0 m) → each pond area = 3,000 m²; total grow-out area = 12,000 m².
Nursery pond: 30 × 20 × 0.8 m → 600 m², 480 m³.
Settling pond: 30 × 30 × 1.5 m → 900 m², 1,350 m³.
Total pond surface area = 13,500 m².
Total pond water volume = 13,830 m³.
(Volume formula used: Volume = L × W × Depth.)
Assumed open-water evaporation (tropical estimate) = 6.0 mm/day (0.006 m/day). Evaporation loss = 13,500 × 0.006 = 81.0 m³/day.
Assumed seepage (compacted clay / low seepage) = 2.0 mm/day (0.002 m/day). Seepage loss = 13,500 × 0.002 = 27.0 m³/day.
Minimal refill (evaporation + seepage) = 81.0 + 27.0 = 108.0 m³/day.
Chosen stocking density: 2.5 fish/m² .
Stocked fish = 2.5 × 12,000 = 30,000 fingerlings.
Assume survival = 85% → harvested fish ≈ 25,500.
Assume average harvest weight = 0.45 kg → Expected yield ≈ 11,475 kg per cycle (~9.6 t/ha; grow-out area = 1.2 ha).
Range: at 2.0–3.0 fish/m² and survival 75–90% and harvest weight 0.4–0.6 kg, expected yields typically range from ~6–15 t/ha depending on management intensity.