Mozambique tilapia

Water parameters

Minimum tank: 200 L per individual at harvest size.

Feed and growth

Feed protein

30% target

Daily feed (warm)

1.50% of body weight

Daily feed (cool)

0.80% of body weight

Max density

55 g per litre

A 500 g adult eats about 7.5 g of feed per day at optimum. 10 fish at adult size: ~75 g daily.

Legality

Rules vary by jurisdiction and change over time. Verify with your local fisheries or wildlife authority before stocking.

Unlisted jurisdictions default to "check local regulations".

Origin and habitat

Oreochromis mossambicus is native to fresh and brackish waters of southeastern Africa, in estuaries and near-shore rivers from the lower Zambezi south to the southeast coast of South Africa. It was the first tilapia widely moved beyond Africa for aquaculture and mosquito control, from the 1930s and 1940s, and has since become one of the world's worst invasive freshwater fish, established across tropical and subtropical regions on every continent but Antarctica. It is the most salt-tolerant of the tilapias, surviving and even breeding from fresh water up to and beyond full-strength seawater, into hypersaline conditions; it also handles low oxygen and a wide temperature span, with cold stress around 15 C, death near 9 to 10 C, and survival up to about 42 C. Adults reach 30 to 40 cm and a half to one and a half kilograms. There is a paradox in its status: a destructive invader abroad, the species is listed as Near Threatened in its native range, where introduced Nile tilapia readily hybridize with it in systems like the Zambezi and Limpopo and threaten to swamp the pure stock. It has been largely replaced in commercial culture by the faster-growing Nile tilapia but remains important in subsistence farming and in saline or brackish systems where Nile tilapia cannot live.

Climate and outdoor ponds

Climate

tropical (needs warm water year-round)

USDA zones

10–13 (winter low around -1°C or warmer)

Heating needed

yes

Cooling needed

no

Care notes

A tilapia for situations that call for extreme tolerance, above all salinity. Mozambique tilapia thrive in brackish water and even seawater, which makes them the one practical tilapia for aquaponics paired with salt-tolerant plants or run on brackish supply. Growth is slower than Nile tilapia, around 300–500 g in nine to twelve months on a pellet of 28 to 32 percent protein, and the body yields smaller fillets; feed conversion is comparable to Nile tilapia in good conditions and holds up better when temperature, salinity, or feed quality swings. They are maternal mouthbrooders and breed even more freely than Nile tilapia, females holding eggs about twelve to fourteen days and spawning several times a season, so all-male stock or steady culling of fry is needed for growth-focused production. Their temperature range is the widest of any tilapia: they keep feeding down toward 15°C and tolerate heat past 40°C. For ordinary freshwater aquaponics in warm climates Nile tilapia is the better pick on growth and conversion; Mozambique tilapia is the fallback for brackish systems, very hot climates, or where Nile tilapia is unavailable. Fingerlings are easy to get in the tropics, and the species is heavily regulated, prohibited across Australia and restricted in some US states, because of its invasive record.

Further reading

• Fish for aquaponics: tilapia vs everything else