Fish · Tilapia
Red tilapia hybrids in Florida aquaponics
Oreochromis hybrids (parentage varies by strain)
Red tilapia are crosses, not a species: the color came from mutant fish, and the strains have since been bred with other tilapias until, SRAC says, most red tilapia in the Americas are of uncertain origin. They sell well because they look like red snapper, and they grew well in the best-known aquaponics trials. In Florida the legal question depends on the parent species, and red stock is often sold without documented parentage, so settle that with the seller and FDACS before buying.1, 2
Where in Florida it works8
Our reading, not a source statement: CIR1051 says hybrid tilapia stop eating below 61 F and begin to die near 55 F, warmer than the blue tilapia's limits. North Florida freezes most winters, so an outdoor system there would need an indoor, covered or heated setup. Central Florida growers would need to watch winter water temperatures closely. Tropical South Florida suits them best. The legal question (see Florida rules) applies in every region.
Our reading of the temperature facts below against UF/IFAS's three regions (North Florida north of State Road 40, Central between 40 and 70, South below 70). A tank with a heater, a greenhouse or a shaded sump changes the answer.
Temperature8
| Optimal water temperature (°F) | 28 to 32 C for optimum growth (converted: 82 to 90 F); 77 to 90 preferred for intensive culture (CIR1051, hybrid tilapia) |
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| Growth slows or stops below (°F) | 61 (16 C; most hybrid tilapia stop eating, CIR1051) |
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| Lethal low (°F) | about 55 (13 C; hybrids begin to die, CIR1051) |
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CIR1051 gives these figures for U.S. hybrid tilapia stocks, which it says come mostly from blue tilapia with some Nile, Mozambique and Wami (Zanzibar) genes, and says hybrid stocks use the blue line for its cold tolerance. It warns that tilapia will not overwinter in most temperate climates. Spawning continues year round while water stays above 72 F (22 C). Red strains with more Mozambique in them may differ; no fetched source gives cold limits for a named red strain.
Florida rules3, 4, 5, 6, 7, 1
| FWC status | Neither FWC nor FDACS lists "red tilapia" by name. The rules are set by parent species. FWC's aquaponics page covers "Blue tilapia (Oreochromis aureus), Nile tilapia (O. niloticus) and hybrids of these two species" (no permit to possess in the Northeast, North Central, South and Southwest FWC regions; a conditional species permit in the Northwest region), names Wami and Mozambique tilapia as conditional species needing authorization throughout Florida, and says "Other tilapia not referenced above are prohibited and are not allowed for use in any aquaponics systems". FDACS-P-01770 (Rev. 12/25): blue and Nile tilapia and hybrids of the two may be kept without a special permit in those four regions; Mozambique and Wami tilapia and "hybrids of the two species" are restricted; "All other tilapia species or hybrids are prohibited in Florida." FWC's Prohibited Nonnative Species List covers the genera Tilapia, Sarotherodon, Alcolapia and Oreochromis, "all species except" O. aureus, O. urolepis, O. mossambicus and O. niloticus. FWC pages show no revision date; read 2026-11-02. |
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| Permit or certificate | Our reading of the agency wording, not an agency ruling: a red line documented as purely blue by Nile would fall in the no-permit group for home use outside the Northwest region; a line from Mozambique and Wami (Zanzibar) parents would be restricted, with no permit available for backyard systems (FDACS-P-01770, FWC aquaponics page); a cross of any other pair, such as Mozambique by Nile or blue by Mozambique, matches neither listed hybrid and would fall under FDACS's sentence that all other hybrids are prohibited. Because SRAC 283 says most red tilapia are mosaics of uncertain origin, a buyer usually cannot tell which group applies from the label. Ask FDACS before buying (Aquaculture_Certificate@FDACS.gov, (850) 617-7600, contact listed on the FDACS Food Fish page). |
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| Selling fish or fingerlings | Same as for the parent species: an FDACS Aquaculture Certificate of Registration for production and sale, an FWC Resident Fish Dealer's license to sell live fish to the public, and an FDACS food permit to sell for human consumption (FWC aquaponics page). Live sale or transfer of restricted species "or their hybrids" is limited to people FDACS or FWC has authorized (BMP manual, FDACS-02034 Rev. 11/2023). |
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| Also | FWC: "It's illegal to release any nonnative species in Florida." The BMP manual says any prohibited species found at a certified farm without FWC authorization must be euthanized at once. |
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Rules change and this is a summary; the agency page in the sources is the authority. Check it before you buy, breed or sell.
Growing1, 2, 8, 9
| Harvest size | about 1.1 lb on average (512.5 g) after 24 weeks in the UVI aquaponic system (SRAC 454); 1 to 1.5 lb (450 to 680 g) for the live market (CIR1051) |
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| Months to harvest | 24 weeks from 58.8 g fingerlings in the UVI aquaponic system (SRAC 454); 6 to 12 months from egg to food size for hybrid tilapia, depending on temperature, density and diet (CIR1051) |
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| Stocking | In the UVI aquaponic system, all-male red tilapia were stocked at 0.58 fish per gallon (154 per cubic metre), twice the Nile rate, and harvested at 0.59 lb per gallon (70.7 kg/m3), growing 2.7 g a day with 89.9 percent survival and a feed conversion ratio of 1.8 (SRAC 454, Table 1). CIR1051 gives 140 to 248 fish per cubic metre (4 to 7 per cubic foot) for 25 to 50 g fish in tanks or raceways. |
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| Feed | CIR1051 for hybrid tilapia: 35 to 50 percent protein for fish under 1 g, 30 to 40 percent at 1 to 5 g, 25 to 30 percent at 5 to 25 g, and 35 to 40 percent for larger fish grown in tanks; 6 to 15 percent of body weight a day for fish under 25 g and 1 to 3 percent above that, spread over 3 to 8 feedings a day. Expect about 1.5 to 3 lb of feed per lb of fish (CIR1051). For aquaponics SRAC 5007 gives floating pellets of 28 to 36 percent protein at 2 to 4 oz a day per 10 sq ft of raft plants. |
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| Water quality | CIR1051 for hybrid tilapia: dissolved oxygen above 3.0 mg/L; carbon dioxide below 15 mg/L; pH 6.0 to 8.5; alkalinity 50 to 700 mg/L; total ammonia nitrogen 0.5 to 1 mg/L; salinity 0 to 28 ppt. SRAC 283 says Mozambique-derived red tilapia are preferred for saltwater culture. For aquaponics SRAC 5007 recommends pH 6.5 to 7.5 and dissolved oxygen above 5 ppm. |
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In the UVI trials red tilapia yielded more fish per year than Nile tilapia (10,516 lb against 9,152 lb per system) but grew more slowly and survived less well (SRAC 454). SRAC 283 says no 'best' red strain can be named, because the lines are mixed and have not been compared head to head.
Breeding and stock1, 3, 5, 8
| How it breeds | SRAC 283 describes three original red strains: the Taiwanese red (late 1960s), from a reddish-orange mutant female Mozambique tilapia crossed with a normal male Nile tilapia; a Florida strain (1970s), from a normal female Zanzibar tilapia crossed with a red-gold Mozambique tilapia; and an Israeli strain, from a mutant pink Nile tilapia crossed with wild blue tilapia. All three have since been crossed with other red tilapia and wild Oreochromis. CIR1051 instead describes the Florida red as a cross of O. aureus and O. mossambicus. CIR1051 calls the Zanzibar fish 'Zanzibar or Wami tilapia (O. hornorum, a.k.a. Tilapia urolepis)', the species FWC lists as O. urolepis. For hybrid tilapia CIR1051 gives sexual maturity at 5 to 6 months and 28 to 350 g, 2 to 5 females per male for spawning, 7 to 10 broods a year, hatching in 2 to 4 days, and about three weeks of mouth care. |
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| Getting fingerlings or stock | CIR1051 says hybrid tilapia are commonly sold as red or golden tilapia. Before buying, ask the seller for the strain's documented parent species and the seller's FDACS Aquaculture Certificate number, since the legal group depends on parentage (see Florida rules). For a home system FWC waives the permit only for fish "acquired in Florida". |
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Hawaiian Gold: no fetched UF/IFAS, FWC, FDACS or SRAC page uses that name, so this record cannot say what it is. The nearest source statement is SRAC 283's mention of true-breeding gold and yellow Mozambique tilapia lines, which it says, like most strains bred for color, do not grow well enough for food-fish culture. If a seller describes Hawaiian Gold as a Mozambique line, the Mozambique tilapia rules would apply (our reading).
Florida sellers of fingerlings, breeders and stock
In an aquaponics system2, 9
well suited
SRAC 454 grew all-male red tilapia in the University of the Virgin Islands raft system alongside Nile tilapia, with the results in its Table 1, and its Figure 1 shows a lettuce crop fed by red tilapia. SRAC 5007 says tilapia generally do well in aquaponics but grow slowly below 68 F. The FAO aquaponics manual could not be fetched.
On the table1, 8
SRAC 283 says red tilapia became popular because they look like marine red snapper, which raises their market value. CIR1051: live fish sell at 1 to 1.5 lb and yield 30 to 39 percent boneless fillet; raw meat has about 96 kcal, 19.2 percent protein and 2.3 percent fat per 100 g; a musty or muddy off-flavor is a common marketing problem, usually cured by holding the fish in clean, flowing water for 7 to 10 days.
What this page doesn't cover yet
- No agency page names red tilapia, the Florida red or the Taiwanese red. The legal grouping in Florida rules is our reading of FDACS and FWC wording by parent species, not an agency ruling.
- Sources disagree on the Florida red's parents: a Zanzibar female by a red-gold Mozambique (SRAC 283) against O. aureus by O. mossambicus (CIR1051). Under FDACS-P-01770 the first would be a restricted Mozambique-Wami hybrid and the second an 'other' hybrid, which FDACS calls prohibited.
- Naming differs: SRAC 283 calls the Zanzibar tilapia O. urolepis hornorum; CIR1051 calls it 'Zanzibar or Wami tilapia (O. hornorum, a.k.a. Tilapia urolepis)'; FWC lists O. urolepis as 'Wami or Rufigi tilapia'. Treating these as one species is our reading.
- No fetched source uses the name 'Hawaiian Gold'. Searches of UF/IFAS, SRAC, FWC, FDACS and FAO domains found nothing.
- No fetched source gives a lethal high temperature.
- Harvest sizes of about 1.1 lb are our conversion of the 512.5 g average in SRAC 454, Table 1; 28 to 32 C converted to 82 to 90 F by us.
- The FAO manual 'Small-scale aquaponic food production' refused the fetch (HTTP 403).
Sources
- Tilapia: Life History and Biology. Southern Regional Aquaculture Center (SRAC), SRAC 283. Read 2026-11-02.
- Recirculating Aquaculture Tank Production Systems: Aquaponics—Integrating Fish and Plant Culture. Southern Regional Aquaculture Center (SRAC), SRAC 454. Read 2026-11-02.
- Aquaponics Licenses & Permits. Florida Fish and Wildlife Conservation Commission. Read 2026-11-02.
- Commercial Aquaponics: Rules and Regulations. Florida Department of Agriculture and Consumer Services, Division of Aquaculture, FDACS-P-01770 Rev. 12/25. Read 2026-11-02.
- Prohibited Nonnative Species List. Florida Fish and Wildlife Conservation Commission. Read 2026-11-02.
- Aquaculture Best Management Practices Manual. Florida Department of Agriculture and Consumer Services, Division of Aquaculture, FDACS-02034 Rev. 11/2023 (Rule 5L-3.004, F.A.C.). Read 2026-11-02.
- Food Fish. Florida Department of Agriculture and Consumer Services, Division of Aquaculture. Read 2026-11-02.
- Culture of Hybrid Tilapia: A Reference Profile. UF/IFAS Extension, EDIS, CIR1051 (FA012). Read 2026-11-02.
- Principles of Small-Scale Aquaponics (September 2015). Southern Regional Aquaculture Center (SRAC), SRAC 5007. Read 2026-11-02.
Every fact above is restated in our own words from these documents, written 2026-11-02. Independent of the University of Florida and of every agency named.