Blue tilapia

Quick facts

Adult size

32 cm, 550 g typical harvest weight

Days to harvest

240 to 365 days from fingerling

Lifespan (max)

up to 10 years

Diet

omnivore

Temperature class

warm-water

Difficulty

beginner

Water parameters

Temperature range

12–32°C (optimum 26°C)

pH

6.5 to 9

Hardness

5 to 30 dGH

Minimum tank

200 L per individual at harvest size

Feed and growth

Feed protein

32% target

Daily feed (warm water)

1.40% of body weight per day

Daily feed (cool water)

0.80% of body weight per day

Max stocking density

55 g per litre of system water

A 550g adult eats about 7.7 g of feed per day at optimum temperature. For a roster of 10 fish at adult size, that's around 77 g of feed daily.

Legality

Aquaculture and possession rules vary by jurisdiction and change over time. This table reflects regulations as of the verified date on each row. Verify with your local fisheries or wildlife authority before stocking.

Jurisdictions not listed here default to "check local regulations". A non-listing is not a green light; rules in your specific county or municipality may apply.

Habitat and origin

Native to the Nile basin, the Jordan River system, Lake Galilee, and coastal rivers of West Africa. Blue tilapia (Oreochromis aureus) tolerates colder water than Nile tilapia, surviving down to about 8–10°C compared to 12°C for Nile tilapia. This cold tolerance makes it the preferred tilapia species for aquaponics and aquaculture in subtropical regions where winter temperatures drop below the Nile tilapia's survival threshold. Wild populations are established in Florida, Texas, and other warm US states where they were originally introduced for aquatic weed control and sport fishing. Adults reach 2–3 kg in culture conditions. The species hybridizes readily with Nile tilapia, and many commercial tilapia operations use blue x Nile hybrids to combine the cold tolerance of blue tilapia with the faster growth rate of Nile tilapia. Pure blue tilapia stock is available from specialist hatcheries but is less commonly farmed than Nile tilapia or hybrids.

Climate and outdoor ponds

Climate classification

tropical (needs warm water year-round)

Outdoor pond zones (USDA)

9 to 13 (winter low around -7°C or warmer)

Heating in a temperate climate

Required for year-round operation

Cooling in a temperate climate

Not required

Zone bounds reflect year-round outdoor pond viability with no active heating. Anywhere outside the bounded zone, the species can still be kept in an indoor heated tank or a seasonally-managed system. Verify your specific microclimate, as a sheltered yard zone can run a half-zone warmer than the regional rating.

Care notes

Same general care as Nile tilapia with the advantage of surviving lower temperatures. In aquaponics systems where winter greenhouse temperatures drop to 12–15°C, blue tilapia continues to feed (slowly) while Nile tilapia would stop eating or die. Growth rate is slightly slower than Nile tilapia under optimal warm conditions but faster in systems with temperature fluctuations because the fish keeps eating through cool spells. FCR is comparable at 1.5-1.9 on commercial pellet. The same reproduction management applies: mixed-sex populations breed constantly, diverting energy from growth. All-male fingerlings are available from specialist hatcheries. Legal status varies by state; blue tilapia is regulated similarly to Nile tilapia and is prohibited in some jurisdictions. Feed the same commercial pellet (32-36% protein). Blue tilapia tends to be more aggressive than Nile tilapia, which causes fin damage and stress at high stocking densities. Keep stocking at 15-30 g/L and provide adequate space. Water quality requirements are the same as Nile tilapia: pH 6.5-8.5, ammonia below 2 mg/L, DO above 3 mg/L.

Further reading

• Fish for aquaponics: tilapia vs everything else