Five Native South American Fish Species Suitable For Aquaponics

Aquaponics is a production system that combines recirculating fish culture with soilless plant cultivation in a single, interdependent loop. Fish produce ammonia-rich waste, bacteria convert that waste into plant-available nitrates, and the plants absorb those nutrients while cleaning the water for the fish.

Aquaponics in South America

The result is a closed-loop food production method that uses up to 90% less water than conventional soil-based farming, according to market analysis by Future Data Stats (2025). Despite this efficiency advantage, South American producers have historically borrowed species from other continents rather than developing their own native fish for these systems.

South America holds a compelling case for native-species aquaponics. The continent is home to the world’s most biodiverse freshwater fish fauna—over 5,600 described species according to the Neotropical Ichthyology Association—and several of those species have already demonstrated strong performance inside recirculating systems.

A landmark peer-reviewed review published in Aquaculture International (Pereira et al., 2021) directly compared five South American native species against tilapia and catfish across zootechnical performance, water quality tolerance, and nutritional flesh composition, finding that all five were genuinely suited for aquaponic integration.

Using five native South American fish species suitable for aquaponics is not a theoretical proposition; it is one backed by controlled trials and a growing body of field data. Three practical advantages make native species worth serious attention.

1. First, they carry endemic disease resistance, meaning they have co-evolved with local pathogens and parasites rather than being introduced into a foreign microbial environment.
2. Second, they are already adapted to the temperature and water chemistry ranges common across South American river basins, reducing energy costs for environmental control.
3. Third, most native species fall under domestic aquaculture regulations rather than CITES or biosecurity import frameworks, dramatically simplifying licensing for producers.

Key Factors When Selecting Native Fish for Aquaponics Systems

Choosing the right fish species for an aquaponic system is not simply a matter of picking the fastest-growing animal available. The fish and the plants share a single water body, and the biological requirements of both must align within the same parameter window. Understanding the selection criteria before committing to a species prevents costly retrofitting later.

1. Climate Compatibility Across South America’s Temperature Zones

South America spans tropical, subtropical, and temperate climate zones, and each zone creates a distinct operating environment for an aquaponic system. Amazonian lowlands maintain year-round water temperatures of 26–30°C, while the southern states of Brazil, Argentina, and Uruguay regularly experience winters where surface water temperatures drop to 12–15°C.

A fish species selected without matching its thermal tolerance to the local climate will either grow slowly or die during seasonal extremes, neither of which is commercially acceptable.

• Tropical species such as Tambaqui and Arapaima perform optimally between 26°C and 30°C and begin showing stress below 22°C.
• Subtropical species like Pacu tolerate a slightly wider band of roughly 20–30°C.
• Temperate-adapted fish like Jundiá remain productive in water as cool as 14°C,

This make them uniquely suitable for the Southern Cone regions where heating costs for tropical species would eliminate profit margins.

2. Feed Conversion Ratio and Time to Market

Feed Conversion Ratio, or FCR, is the mass of feed required to produce one unit of fish body weight. An FCR of 1.5 means the fish consumed 1.5 kg of feed to gain 1 kg of body weight; lower numbers indicate more efficient conversion. In commercial aquaponics, feed costs represent 40–60% of total variable operating costs, so FCR has a direct and outsized impact on profitability.

Tambaqui juveniles in recirculating systems have demonstrated FCR values between 1.3 and 1.8 under optimized feeding protocols, which is comparable to tilapia under similar conditions. Time to market size is equally critical.

A species that requires 36 months to reach harvest weight ties up tank space, infrastructure, and working capital that could otherwise turn two or three production cycles. Growers should target species that reach commercially acceptable weights—typically 500 g to 2 kg depending on the market—within 8 to 18 months of grow-out.

3. Water Quality Tolerance in Recirculating Systems

In a coupled aquaponic system—one where fish and plant water is shared continuously—fish must tolerate the chemical conditions that also suit nitrifying bacteria and plant root zones. The optimal pH window for coupled aquaponics typically sits between 6.8 and 7.2, a compromise between the fish’s preference for slightly acidic conditions and the nitrification bacteria’s preference for neutral to slightly alkaline water.

Total ammonia nitrogen (TAN) above 3 mg/L begins to stress most warm-water fish, while nitrate concentrations up to 150 mg/L are generally tolerable for species selected in this article.

Dissolved oxygen (DO) management is particularly important in high-density recirculating systems. Most warm-water native species require DO above 5 mg/L for active growth, though Arapaima is a notable exception due to its obligate air-breathing biology. Growers should plan aeration capacity to maintain DO at 6–8 mg/L as a safety margin above minimum thresholds.

4. Market and Culinary Demand for Native Species

A fish that grows well in a tank but has no local or export buyers is commercially useless. Native South American species benefit from deep-rooted culinary traditions.

1. Tambaqui is the most consumed freshwater fish in northern Brazil and commands a farmgate price of approximately R$10–12/kg in regional markets.
2. Arapaima (known as Paiche in Peru and Pirarucu in Brazil) is prized by fine-dining restaurants for its large, boneless fillets and typically sells at a significant premium over commodity fish.

Understanding whether the target market values live fish, fresh fillets, or value-added processed products shapes which species makes the most economic sense for a given operation.

5. Legal and Environmental Considerations for Native Species

Using native species in aquaponics carries distinct legal advantages over farming exotic imports. Brazilian federal legislation under IBAMA (Instituto Brasileiro do Meio Ambiente e dos Recursos Naturais Renováveis) generally allows native freshwater fish farming with straightforward licensing, whereas introducing non-native species can trigger additional environmental impact assessments.

The risk of accidental release creating invasive populations—a documented problem with Nile tilapia in South American waterways—is also eliminated when producers work with species already present in local river systems. Growers must still comply with individual state regulations and CITES provisions for species like Arapaima, which is protected in some wild collection contexts but fully legal to farm from hatchery stock.

Five Native South American Fish Species Suitable for Aquaponics

The following five species represent the strongest candidates for aquaponic production across South America’s diverse agricultural zones. Each profile covers native habitat, optimal system parameters, growth performance benchmarks, and the practical realities of commercial-scale management.

1. Tambaqui: Brazil’s Most Farmed Native Species

Tambaqui (Colossoma macropomum) is the flagship native species for South American aquaponics. Native to the Amazon and Orinoco River basins, it is the most cultivated native fish in Brazil and plays a central role in the country’s freshwater aquaculture sector.

A 2025 study confirmed that Tambaqui juveniles in recirculating aquaculture systems (RAS) achieved optimal growth when fed at 10–25% of biomass daily, with the highest specific growth rates recorded at these feeding intensities.

In commercial terms, Tambaqui was the second most exported fish species from Brazil in 2023, generating export revenue of USD 798,000—an increase of 809% compared to 2022 (Peixe BR, 2024), which signals explosive market growth.

Tambaqui’s omnivorous diet is one of its greatest advantages for aquaponics. It readily accepts commercial pellets formulated from plant-based ingredients—soybean meal, corn, and rice bran are all viable dietary components—which reduces dependency on expensive fishmeal and lowers overall feed costs.

It thrives at water temperatures between 26°C and 30°C, tolerates pH from 6.0 to 8.0, and shows notable resilience to short-term fluctuations in dissolved oxygen, a characteristic rooted in its natural experience with Amazonian várzea (floodplain) environments where seasonal oxygen depletion is common.

A 2024 study in Ciência Animal Brasileira (Gomes et al.) tracked 240 juvenile Tambaqui grown in an aquaponic system integrated with açaí palm cultivation over 180 days, finding that fish progressed from an average weight of 103 g through to 1,815 g while water quality parameters remained within acceptable thresholds for both fish and plants throughout. This demonstrates the species’ compatibility with multi-crop aquaponic integration beyond leafy greens.

The main challenge with Tambaqui is size management. Adult fish can reach 30 kg in the wild and 3–5 kg under farming conditions, requiring tank volumes of at least 1,000 liters per 50 kg of biomass to avoid growth suppression from crowding. Small-scale producers must plan tank infrastructure carefully before committing to this species.

Gomes et al. (Ciência Animal Brasileira, 2024) found that Tambaqui in an integrated aquaponic-açaí system gained 1,712 grams of body weight over 180 days with water quality parameters remaining within safe thresholds for both fish and plant production throughout the entire trial period. Growers can integrate Tambaqui with high-value tropical crops like açaí, dramatically increasing revenue per square meter of system footprint.

2. Pacu: The Subtropical Generalist

Pacu, scientifically designated Piaractus mesopotamicus, is native to the Paraná-Paraguay River Basin and is one of the most economically significant freshwater fish in central and southern Brazil, Argentina, and Paraguay. Where Tambaqui is the Amazon’s dominant cultivated species, Pacu fills a comparable role in the subtropical Pantanal and Cerrado regions.

Its natural temperature range of 20–30°C makes it more adaptable to the seasonal variation experienced in these zones than strictly tropical species. Pacu’s adaptability to plant-based diets is exceptional among carnivore-adjacent species. Its molars—blunt, human-like teeth evolved for crushing seeds and fruits—allow it to process a wide variety of plant feedstuffs efficiently.

Research published in PLOS ONE (Lazzari et al., 2023) confirmed that Pacu maintained strong growth performance on diets with soybean meal as the primary protein source, achieving FCR values between 1.4 and 1.9 across trials. This feed flexibility is operationally significant because it decouples production costs from volatile fishmeal commodity markets.

In terms of market acceptance, Pacu is deeply embedded in Brazilian and Paraguayan food culture. It is a staple of traditional churrasco (barbecue) and is consistently among the top five freshwater species consumed in the Central-West and South regions of Brazil. This cultural familiarity means producers face minimal market education costs compared to introducing a novel protein to consumers.

Management considerations for Pacu in aquaponics include its tendency toward aggression at high stocking densities, particularly between fish of different size classes. Grading fish into uniform-size cohorts every 4–6 weeks and maintaining stocking densities below 80 kg/m³ helps mitigate this behavior and keeps FCR within the profitable range.

3. Surubí: The Premium-Value Catfish

Surubí refers collectively to large spotted catfish in the genus Pseudoplatystoma, with P. corruscans (pintado) and P. reticulatum (cachara) being the two species most commonly targeted by aquaculturists.

Native to the major river systems of central South America—the Paraná, Paraguay, and São Francisco rivers—Surubí occupies the premium end of the Brazilian freshwater fish market, with farmgate prices frequently reaching R$25–35/kg, three to five times the price of Tambaqui in equivalent markets.

The critical management challenge with Surubí is its carnivorous feeding requirement. Unlike Tambaqui or Pacu, Surubí naturally preys on other fish and will not readily accept plant-based formulations without careful conditioning.

Juveniles must be weaned onto commercial pellets through a stepwise transition beginning with live prey, then frozen fish, then moist pellets, and finally dry extruded feeds—a process that takes 4–8 weeks and requires skilled feeding management. Once weaned, Surubí grows reliably on high-protein (40–45% crude protein) pellets and can reach market weight of 1.5–2 kg in 18–24 months.

For aquaponics specifically, Surubí is best suited to decoupled systems—designs where fish and plant water cycles are managed separately—because the higher protein feed required by this carnivorous species generates elevated ammonia loads that can destabilize the nitrification biofilm if not managed with dedicated biofilters. Producers who can manage this complexity are rewarded with a high-value product that commands strong margins in premium food service and export channels.

4. Jundiá: Cold-Tolerant and Commercially Underutilized

Jundiá, the South American silver catfish, is one of the most scientifically documented native species for temperate aquaculture in the Southern Cone. Distributed across river systems from southern Brazil through Uruguay, Argentina, and into Chile, Rhamdia quelen tolerates water temperatures as low as 14°C and as high as 28°C, making it uniquely suitable for producers in regions where heating tropical species year-round would be cost-prohibitive.

Jundiá’s key performance metrics place it solidly in the commercially viable range. It is omnivorous, accepting both animal and plant-based feed components, and achieves FCR values of 1.4–2.0 under well-managed conditions. Growth rate is moderate compared to Tambaqui—expect 400–600 g in 12 months under optimal feeding—but this is entirely adequate for small to mid-scale operations targeting local markets where fresh, locally grown fish commands a price premium over frozen imports.

The Aquaculture International review by Pereira et al. (2021) specifically noted Jundiá’s tolerance for the water quality conditions common in coupled aquaponics:

• pH between 5.4 and 7.0,
• ammonia tolerance at levels workable within normal system bioloads, and
• good survival at stocking densities suitable for commercial recirculating production.

For small farms in Rio Grande do Sul, Santa Catarina, or the Argentine Mesopotamia region, Jundiá represents the most accessible entry point into native-species aquaponics because it requires no supplemental heating during winter months.

Pereira et al. (Aquaculture International, 2021) reviewed production data for five South American species and found that Jundiá (Rhamdia quelen) maintained productive growth at temperatures as low as 14°C, a threshold at which tropical species like Tambaqui experience growth suppression exceeding 70%.

Southern Cone producers can run profitable aquaponic systems year-round using Jundiá without investing in water heating infrastructure, substantially reducing capital costs.

5. Arapaima: The Highest-Value Species in the Basin

Arapaima—called Paiche in Peru and Pirarucu in Brazil—is one of the world’s largest freshwater fish and carries some of the most distinctive biology of any aquaculture species. Native to the floodplains of the Amazon Basin, it is an obligate air-breather, meaning it must surface to breathe atmospheric air through a modified swim bladder.

This singular trait allows it to survive in hypoxic (low-oxygen) water with dissolved oxygen as low as 0.5 mg/L, an impossibility for gill-only species. In aquaponic tanks, this means Arapaima can tolerate conditions during power outages or aeration failures that would kill other fish—a meaningful biosecurity advantage in remote or infrastructure-limited production environments.

Growth performance is Arapaima’s most compelling commercial attribute. The fish gains approximately 10 kg per year under managed feeding conditions and reaches market weight rapidly after approximately 12 months of age, according to the University of Florida’s IFAS extension aquaculture profile (Durland Donahou, 2021).

Arapaima’s boneless, high-yield fillet and rapid growth trajectory make it the single most commercially compelling native species for aquaponics in South America—but only for producers who can match its infrastructure demands with genuine operational discipline.

Despite being predatory by nature, Arapaima adapts well to commercially available pelleted feeds, achieving feed conversion ratios of 1.7–2.3—competitive with many established aquaculture species. Fillet yield is exceptionally high at 50–55% of live body weight, with no intramuscular bones, characteristics that make it highly attractive to processors and restaurateurs.

An economic evaluation of Arapaima production in earthen ponds in San Martín, Peru (Bol. Inst. Pesca, 2023) found that 300 juvenile fish stocked at 10 fish/m² achieved a total weight gain of 11 kg per fish over 390 days with a total production cost of USD 14,691 for 2,964 kg of fish—a competitive cost structure that improves further in the controlled water quality of a recirculating aquaponic system.

System requirements are the principal barrier to entry. Arapaima require large tanks—minimum 10,000 liters per cohort of grow-out fish—because crowding triggers stress, suppresses growth, and increases susceptibility to injury from tank-wall collisions.

Producers must also plan for their obligate air-breathing behavior by ensuring tank surface areas are unobstructed and fish are not startled during surface respiration. Commercial-scale Arapaima aquaponics is genuinely viable, but it is a system designed for experienced operators with established market access, not beginner producers.

Comparative Analysis of Five Native South American Aquaponics Fish

The table below summarizes the key production parameters for the five species discussed, providing a side-by-side reference for system designers and farm planners evaluating which species best fits their operational profile.

Production Considerations for South American Aquaponic Farms

Understanding each species in isolation is necessary but not sufficient. A functioning aquaponic farm integrates fish biology, plant nutrition, water chemistry, and economic management into a single operating system, and each of those dimensions interacts with the others in ways that can amplify either success or failure.

i. Integrating Native Fish with Vegetable Crops

The fish species chosen directly influences which plant crops can be grown profitably. Omnivorous species like Tambaqui and Pacu produce nutrient profiles well-suited to leafy greens—lettuce, chard, pak choi, basil—because their moderate feed rates generate stable, predictable nitrate flows that these crops absorb efficiently.

Carnivorous species like Surubí and Arapaima, fed high-protein diets, generate higher nitrogen loads that can support more nutrient-demanding crops such as tomatoes, peppers, and cucumbers, provided the system includes adequate biofilter capacity to prevent ammonia spikes between feeding cycles.

Research at Brazilian federal universities has shown that Tambaqui-based aquaponic systems supporting leafy green production can achieve nitrogen utilization efficiency (NUE) of up to 50.9% at pH 6.0, meaning roughly half the nitrogen excreted by fish is captured productively by plants rather than lost to denitrification or water exchange. This efficiency metric drives the economics of the plant side of the business.

ii. Feed Sourcing and Cost Management

For all five species, feed represents the dominant variable cost, typically consuming 40–60% of total operating expenditure in intensive recirculating systems. South American producers have a natural advantage here: the continent produces the world’s largest volumes of soybean meal and corn, both of which form the backbone of plant-based aquaculture feeds.

For omnivorous species like Tambaqui, Pacu, and Jundiá, commercially formulated pellets with 28–32% crude protein derived primarily from plant sources perform well, keeping feed costs substantially below systems reliant on marine fishmeal.

Carnivorous species require higher protein concentrations—typically 40–45% crude protein—which increases feed cost per kilogram of fish produced. Producers managing Surubí or Arapaima should factor this into their profitability models and ensure their market pricing reflects the higher input cost, which the premium farmgate prices for these species generally support.

iii. Biosecurity Practices in Native-Species Systems

Native species carry the advantage of co-evolutionary exposure to local pathogens, but this does not mean they are immune to disease in high-density recirculating environments.

The most common health challenges in South American aquaponic systems include bacterial infections from Aeromonas hydrophila and Flavobacterium columnare, both of which thrive when fish are stressed by poor water quality or overcrowding. Effective biosecurity requires the following steps in sequence.

1. Source fingerlings exclusively from certified, disease-free hatcheries that practice routine health screening and provide health certificates for each batch.
2. Maintain a 14-day quarantine tank for all new stock before introducing them to the main production system, observing fish daily for behavioral and physical signs of illness.
3. Monitor water quality parameters—TAN, nitrite, nitrate, dissolved oxygen, pH, and temperature—at least twice daily using calibrated probes, and log all readings for trend analysis.
4. Establish feeding logs and monitor feed intake daily; a sudden reduction in feed consumption is the earliest and most reliable indicator of emerging disease or environmental stress.
5. Develop a relationship with an aquatic veterinarian before disease events occur, ensuring rapid access to diagnosis and approved treatment protocols when needed.

iv. Scaling from Smallholder to Commercial Operations

One of the genuine strengths of native-species aquaponics in South America is the scalability of the model. A smallholder system of 5,000 liters of fish tank volume producing Jundiá alongside lettuce can generate meaningful supplementary income for a family farm with an investment of USD 3,000–8,000.

Scaling to commercial operations of 50,000–200,000 liters requires professional engineering of biofilter capacity, water recirculation rate, and crop planting schedules, but the core biology remains identical. The critical success factor at every scale is maintaining the nitrification cycle—the bacterial conversion of ammonia to nitrate—which requires a stable, established biofilm and consistent feeding management.

Economic Viability and Sustainability of Native-Species Aquaponics

The economic case for native South American fish in aquaponics rests on three reinforcing pillars: reduced input costs relative to exotic species, premium market pricing for recognized native foods, and the environmental value proposition that increasingly matters to institutional buyers and export markets.

Reducing dependency on imported exotic species like Nile tilapia carries real financial benefits beyond mere regulatory compliance. Tilapia fingerling supply chains in South America are controlled by a small number of genetic improvement programs, and their prices fluctuate with international feed ingredient markets.

Native species hatcheries, by contrast, are increasingly distributed across the continent, reducing fingerling transport costs and mortality during delivery. Brazil’s Tambaqui fingerling market, for example, now supports hundreds of specialist hatcheries across the northern states, giving producers competitive pricing and reliable supply.

Environmental impact reduction is another genuine economic driver, particularly as export regulations in the European Union and North America increasingly require carbon footprint documentation for imported food products.

Aquaponic systems using native species and plant-based feeds generate significantly lower life-cycle emissions than pond-raised exotic species reliant on marine fishmeal. For producers targeting premium export markets, this environmental credential translates into a real price premium and market access advantage.

Local food security contributions are difficult to quantify precisely but are substantively important in the South American context. Freshwater fish consumption in the region stands at only 3.2 kg per person annually, well below the global average of 8.2 kg, according to FAO data cited in Pereira et al. (2021).

Aquaponic systems using native species can produce both animal protein and vegetables within urban and peri-urban areas, shortening supply chains and reducing cold-chain losses that erode food security in remote communities.

The Right Native Fish for Every Scale

Five native South American fish species suitable for aquaponics address the full spectrum of South American production environments, from small family farms in the cold winter zones of Rio Grande do Sul to large commercial facilities in the Amazonian lowlands of Brazil and Peru.

• Jundiá is the most accessible entry point for temperate-zone smallholders: cold-tolerant, omnivorous, well-documented, and forgiving for beginning aquaponic operators.
• Tambaqui and Pacu represent the commercial mainstream in tropical and subtropical zones respectively, combining proven growth performance, plant-based feed compatibility, and deep market roots that reduce sales friction.
• Surubí occupies the profitable but technically demanding middle tier, rewarding experienced operators with premium-priced fillets that command strong positioning in food service channels.
• Arapaima is the highest-risk, highest-reward option, suited exclusively to well-capitalized commercial systems with established fine-dining or export market access and the operational sophistication to manage large-tank recirculating biology.

Looking forward, the convergence of rising domestic fish consumption demand, tightening regulations on non-native species, and growing institutional interest in sustainable food systems positions native-species aquaponics as one of South America’s most strategically important agricultural growth vectors. Research institutions including EMBRAPA in Brazil and INIA in Peru are actively funding trials on feeding optimization, genetics, and system design for these species, and the pace of peer-reviewed publication has accelerated sharply since 2022.