Rectangular ponds (60 × 50 m) are easy to earthwork, subdivide and allow straightforward water circulation and draining with a single longitudinal outlet. The area chosen (3,000 m² per pond) balances manageable harvest operations with economies of scale (mechanized feeding, harvesting) while keeping dike lengths and embankment earthworks reasonable for low-cost construction.
The Ayala river intake which is settling pond that takes gravity distribution layout and matches a gently sloping floodplain plan (little cut-and-fill), minimizing pumping costs. A small slope (0.25% on pond bottom and 0.5% on main drain) is enough to encourage complete drainage to the monk outlet while still being stable for earthen construction. The settling pond upstream removes most silt before water enters production ponds .
Tilapia is chosen because it tolerates a wide range of temperatures (typical Zamboanga means ≈ 28–30 °C), does well in earthen ponds, and has widely-available seed and feed in Region IX. Stocking densities were chosen to match semi-intensive culture (moderate feeding and exchange). If salinity testing (site) shows brackish conditions, milkfish (bangus) could be considered for brackish ponds; otherwise tilapia and polyculture with carp/catfish are appropriate.
The pond system is strategically located near Ayala River because it provides a reliable and sustainable water source for aquaculture. The river ensures continuous water supply needed for pond filling, daily replenishment, and compensation for water loss due to evaporation and seepage. Its proximity minimizes the need for expensive pumping systems, making the operation low-cost and energy efficient. The area around Ayala River has flat terrain and clay-loam soils, which are ideal for constructing earthen ponds that retain water effectively. At the same time, the river setting offers natural drainage opportunities, allowing the ponds to be fully emptied during harvest or cleaning. From a socio-economic perspective, Ayala is an agricultural community in Zamboanga City where fish farming can enhance local livelihoods. Locating the ponds near the river integrates well with existing farming systems and provides easy market access for harvested fish.