This is a joint effort by the Norwegian, Iceland and Mozambique governments to promote tilapia culture in Mozambique. The hatchery has GIFT tilapia, a stock of Nile tilapia genetically selected for fast growth and adaptation to aquaculture conditions. This hatchery produces all male fingerlings by mating YY male tilapia with XX female tilapia. The YY males are created by several hormone or temperature mediated techniques to produce YY rather than XY males. YY males of other kinds of animals would not be viable but for Nile tilapia, they are. So if this hatchery can produce massive numbers of XY male fingerlings, they can sell them to grow-out tilapia farmers who simply grow the fish to market size and then come back to this hatchery again to purchase more fingerlings for the next crop. The fish farmers at Zuza are too small scale and too far away to effectively purchase all-male fingerlings each crop cycle, but if they can get XY and XX GIFT tilapia to start their own broodstock program at Zuza, they will have better harvests than using stocks from other sources or wild Nile tilapia from the Limpopo River drainage.