Exotic tilapia with a bluish head during spawning, tolerant of cold. It is established in Mexico, Central America and Peru; in Brazil we found no records of free-living populations. Fish with light tackle and never release into a river or reservoir.
Cichlid native to the Middle East and northern and western Africa (Jordan River, lower Nile, Chad, Niger and Senegal), taken to fish farming in many countries. FishBase records its introduction to Brazil, from the United States in 1965; we found no published records of free-living populations in the country, unlike the Nile tilapia. It is established in Mexico, Cuba, Costa Rica, Guatemala, Nicaragua, Panama and Peru, where it competes with native fish, the best-documented case being Nicaragua. It is cold-tolerant (8 to 30 °C), forms shoals, eats phytoplankton and little zooplankton, and the female incubates the eggs in her mouth. Spawning only occurs above about 20 °C.
fun facts
Cold-tolerant: lives from 8 to 30 °C and withstands up to 41 °C.
The male digs a nest 4 to 6 m across and up to 60 cm deep, and defends its territory with side displays, bites and mouth-to-mouth fights.
A female can carry up to 2,000 eggs in her mouth.
It crosses with the Nile tilapia, and these hybrids were used in fish farming to produce all-male batches.
how to recognize it
identification
Tall, compressed body. The tail lacks the regular vertical stripes of the Nile tilapia and has a wide pink-to-bright-red border. Breeding males have an intense metallic blue head, a dorsal fin with a red edge and a stronger pink tail; females have orange, paler fin edges. Juveniles show oblique stripes on the soft dorsal fin and a dark spot on it. In old records, blue tilapia was often identified as Nile tilapia.
how blue tilapia fishing looks
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Each card shows the day's index (0 to 100) and, below it, a strip with the index for each hour, from 0h to 23h. from poor to excellent.
Exotic in Brazil, where FishBase records an introduction (1965); we found no published records of free-living populations. Native to the Middle East and Africa; outside Brazil, established in Mexico, Central America, the Antilles and Peru.
Habitat: Lakes, reservoirs, rivers and canals of warm water, in open water or among rocks and vegetation; tolerates brackish water. Males dig nests in shallow vegetated water, up to 60 cm deep.
calendar and clock
when to fish
best season
time of yearbest: Oct–Mar
JanFebSeaAprMayJunJulAugSepOctNovDec
Spring and summer. Spawning requires at least 20 °C and long days, and activity drops sharply in winter, although the species tolerates cold well.
best time of day
Daytime. Feeds by day, most active in the warm hours when the water is cold, and early or late in the afternoon in hot weather.
weather, water and behavior
what affects the blue tilapia
sensitivity The little bars show how much each factor affects this species. Five full: it feels it a lot.
cold and cold fronts
Tolerates cold well, but below about 18 °C it eats little.
atmospheric pressure
Little effect.
moon
No significant effect.
rain
Cold rain shuts down activity.
water level
Small effect; look for shallow banks and structure.
noise
Tolerant, used to fishing ponds and tanks.
wind
A little chop helps; strong wind makes it hard to see the float.
depth
Shallow in heat and during spawning; deeper in cold.
Feeding float with pellet bait and a small hook 20 to 40 cm below. Set the hook lightly when the float runs away; the mouth is small.
what the law says
rules for the blue tilapia
Summary of the regulations we found, with the source for each. Rules change; before keeping or transporting fish, check with the state environmental agency. Conservation: Not on the Brazilian national list (Portaria GM/MMA nº 1.667/2026). Exotic species: management aims to prevent new releases.
Releasing into a river, lake or reservoir without a license is an offense
introducing or releasing into the natural environment is banned without a technical opinion and a licenseconfirm with the agency
Introducing an animal specimen, native or exotic, into the country or outside its natural range, without a favorable official technical opinion and a license from the environmental authority, is an offense (Decreto 6.514/2008, art. 25) and a crime (Lei 9.605/1998, art. 31). Releasing blue tilapia from a tank, fish farm or aquarium into a river, lake or reservoir falls under this, according to environmental agencies. Anglers catching the fish in the environment where it already lives should follow the local rule on releasing or killing it.
Mato Grosso do Sul: tilapias can be added to the bag limit
fish may be added to the limit of 1 fish + 5 piranhas, observing the closed seasonMSParaguay (Pantanal)Paraná
State Decree 15.166/2019, art. 7º, allows recreational anglers to add to their limit fish of exotic, allochthonous and hybrid species, including tilapias (Oreochromis spp. and Tilapia spp.), provided the closed season is observed.
Mato Grosso: introducing an exotic species without a license brings a fine
fine of R$6,000 to R$100,000, plus R$100 per kilo or fractionMT
Art. 46 of MT's fishing law penalizes anyone who introduces native, exotic or non-native species without authorization or a license from the competent agency, or in breach of the license. It applies to releasing captive-raised fish into a river or lake.
Mato Grosso: catch and transport of exotic fish have their own resolution
under Cepesca Resolution nº 02/2024MTParaguay (Pantanal)AmazonTocantins-Araguaiaconfirm with the agency
The official Sema-MT table (updated June 6, 2025) cites Cepesca Resolution nº 02, of March 7, 2024, which regulates the catch and transport of exotic fish in the rivers of the Paraguay, Amazon and Araguaia-Tocantins basins. We did not check the text of the resolution: confirm the conditions with Sema-MT before transporting. Transporte Zero under art. 19-B covers only the 12 native species on the list, none of which are tilapias.
Mexico: up to 5 freshwater fish per day, no live fish as bait
5 freshwater fish per angler per day; 1 rod; no sale
In Mexico's federal-jurisdiction inland waters, the limit for freshwater species is 5 fish per angler per day, with only one rod in operation. Using fish as live bait in inland waters is banned, and fish caught in sport fishing may not be sold. Each reservoir's committee may lower the limit and set sizes. The rule does not mention tilapia or give an exception for exotic species; fish above the limit may be caught if released alive (item 4.9.5).
Goiás: blue tilapia is not on the list of released exotic species
outside Annex II: zero transport limit; on-site consumption of up to 5 kgGOTocantins-AraguaiaParanáSão Franciscoconfirm with the agency
Annex II of IN Semad-GO nº 17/2026 releases, with no size or quantity limit, the listed exotic species, among them the Nile tilapia, the Mozambique tilapia and the redbreast tilapia, but does not mention Oreochromis aureus. For blue tilapia, in principle, the zero transport limit of art. 2º applies, with on-site consumption of up to 5 kg per angler. Confirm with Semad-GO, since the list is by basin and may be updated.
catch and release Releasing the fish alive, quickly and with a wet hand. During a closed season it isn't always allowed: what the regulation says applies.
Exotic: do not return it to environments where it does not yet exist, and never release live fish from a tank or fish farm into a river, lake or reservoir. Where local rules allow, prefer killing it for food.
in the kitchen
FishBase describes it as tasty. White, firm fillet, fried, baked or grilled, like other tilapias.
calculator
how much it weighs without taking it out of the water
Length-weight relationship W = a·Lb (a = 0.01738, b = 2.99; FishBase (relação peso-comprimento bayesiana, estimativa da própria espécie)). It's an average: a fat or lean fish can vary by 10% to 20%.
estimated weight
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sources and references
The season weights (months), the time of day and the sensitivities (cold, pressure, moon, wind, rain, tide, strong light, murky water and noise) are the app's editorial estimates, based on the literature below and on the field experience of anglers and guides. They are not official data nor a measurement made for this species, and they may vary by region and year. Closed seasons and legal rules appear in the rules section, with the norm and a link.
scientificFishBase: Oreochromis aureus (ficha da espécie)Size, length-weight relationship, depth, habitat, distribution, biology and IUCN status. Page checked on October 13, 2026. The common size and weight and the depth range are editorial estimates for sport fish (FishBase gives a common length of 16 cm, from farmed fish). The maximum weight of 2.0 kg is the published one. The species has no IUCN assessment.
scientificFishBase: introduções de Oreochromis aureusList of introductions by country, with the entry into Brazil (1965, from the USA) and in Latin American countries. Page checked on October 13, 2026.
