A feeding demonstration was conducted at the Phu Long Reservoir, Dalai, Ninh Binh, Yen Khanh District, Vietnam to demonstrate the growth potential of tilapia (Oreochromis niloticus) cultured using soy-based feeds in 4-m3 LVHD cages. Tilapia fingerlings of 145 g were stocked into three 4-m3 cages at 1,200 fish per cage. Fish in all three cages were fed a soybean meal based, extruded feed that was produced domestically in Vietnam. After 72 days of culture the tilapia reached an average size of 495 g with an average FCR of 2.17:1. Gross production averaged 145.75 kg/m3 of cage volume.