Assessing the impact of a budget cage technology on Nile Tilapia (Oreochromis niloticus) production in the Bontanga, Golinga and Libga reservoirs in Northern Ghana, Africa

The potential of irrigation reservoirs in northern Ghana to support Nile Tilapia ( Oreochromis niloticus ) production in 1 m 3 budget cages was assessed over six-months in three reservoirs (Bontanga, Golinga and Libga). Fingerlings with a mean weight of 17.0 ± 5.0 g were randomly stocked at 50, 100, 150, 200 and 250 fish per cage in duplicate and fed with a commercial tilapia feed (Raanan, 30% protein level) at 3 to 5% body weight. The results indicated that the lower densities (50 and 100 fish m -3 ) had a higher specific growth rate (SGR) compared to higher densities (150-250 fish m -3 ). The gross yield (7.5–23.1 kg cage -1 ) differed with increasing density on all reservoirs. Consumers in the Tamale Metropolis preferred small sized tilapias (5-6 fish kg -1 ) and were willing to pay US$ 1.40-2.34 kg -1 of fish, while restaurants preferred 2-3 fish kg -1 and were willing to pay US$ 3.27- 3.51 kg -1 . The 200 fish m -3 stocking density was the most profitable and is recommended for cage culture on reservoirs in northern Ghana.