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Salminus
Temporal range: Late Miocene–present
Salminus franciscanus
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Characiformes
Family: Bryconidae
Subfamily: Salmininae
Cockerell, 1915[2]
Genus: Salminus
Agassiz, 1829[1]
Type species
Hydrocyon brevidens
Cuvier, 1819[1]
Species

see text

"Salmininae" redirects here; not to be confused with Salmoninae.

Salminus, popularly known as dorado or dourado, is a genus of relatively large (up to 1.3–1.4 m or 4.3–4.6 ft long[3][4]), predatory freshwater fish from the family Bryconidae, of which they are the only members of the subfamily Salmininae.[5] They are native to large tropical and subtropical rivers in South America, and undertake migrations during the rainy season to spawn.[6] They are very popular among recreational anglers and also support important commercial fisheries.[6]

Species

[edit]

Significant taxonomic confusion has surrounded this genus, and until a review in 1990, several additional species were recognised (most of these are junior synonyms of S. brasiliensis).[7] Although known for more than 150 years, S. franciscanus was only scientifically described in 2007.[6] The following valid species are recognised:[8]

† = extinct

References

[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Salminus

View on Grokipedia
from Grokipedia
Salminus is a of large, predatory freshwater fishes in the family Bryconidae, consisting of seven species native to river basins across . These characiform fishes, commonly known as dorados or dourados, are piscivorous apex predators characterized by their streamlined, silvery bodies, forked caudal fins, and sharp, recurved teeth adapted for capturing prey. The species within the exhibit migratory behaviors, often traveling long distances for spawning in fast-flowing rivers and tributaries. Adults can grow to significant sizes, with S. brasiliensis (the golden ) reaching up to 100 cm in standard length and weights up to 31 kg, making it one of the largest characins. Salminus species are highly valued in both commercial fisheries and recreational due to their aggressive fighting ability and economic importance in regions like , , and . However, populations face threats from caused by dams, , and , impacting their ecological role as top predators in Neotropical freshwater ecosystems.

Taxonomy

Etymology and naming

The genus name Salminus was established by in 1829 within the work Historia naturalis piscium et amphibiorum Brasiliae co-authored with Johann Baptist von Spix, deriving from the Latin salmo (referring to or ) combined with a -inus, to evoke the predatory and migratory behaviors reminiscent of salmonids despite lacking close relation to them. This naming highlights superficial similarities in form and habits, such as the elongated body and aggressive hunting style observed in South American river systems. The type species of the , Salminus brasiliensis, was first described by in 1816 under the name Hydrocyon brasiliensis in his Règne Animal, based on specimens from Brazilian waters, before its reassignment to Salminus reflecting refined taxonomic understanding. Common names for species in this genus, particularly S. brasiliensis, include "" in Spanish and "dourado" in Portuguese, both translating to "golden" and derived from the Latin auratus (gilded), in reference to the species' striking iridescent golden flanks and yellowish hues. Regionally, it is also called "river tiger" due to its fierce predatory nature, powerful strikes, and ability to leap during pursuits, earning a reputation among anglers for combative behavior akin to a . The Salminus is classified within the Bryconidae.

Classification and phylogeny

Salminus belongs to the kingdom Animalia, phylum Chordata, class , order , family Bryconidae, subfamily Salmininae, and genus Salminus. The genus currently comprises six recognized valid species. A 2022 taxonomic revision confirmed this count by recognizing additional species previously considered synonyms or subspecies. Historically, Salminus was classified within the family , but molecular phylogenetic analyses in the confirmed its placement within the family Bryconidae. This separation was based on evidence that Bryconidae, including Salminus, forms a distinct from the remaining characids, reflecting evolutionary divergence within the order . Phylogenetically, Salminus is positioned within Bryconidae as a distinct closely related to , a relationship supported by molecular studies using mitochondrial and nuclear sequences. Subsequent analyses in the confirmed this placement, emphasizing shared synapomorphies such as dentition patterns and body morphology that distinguish the subfamily Salmininae from other characiforms. These studies highlight Salminus as part of a basal lineage among Neotropical characins, with divergence estimates suggesting the genus originated around 30 million years ago during the . The fossil record of Salminus extends to the , with the extinct species Salminus noriegai described from well-preserved cranial material recovered in the Ituzaingó Formation of central-eastern . This specimen, dated approximately 7–11 million years ago, provides the earliest direct evidence of the genus and indicates its presence in ancient South American river systems similar to modern habitats.

Description

Physical characteristics

Salminus species exhibit an elongated, body shape characterized by a strong, muscular build that facilitates rapid and sustained swimming in riverine environments. The body features an oval cross-section, with the greatest depth located at the dorsal-fin origin, and a narrow caudal peduncle that enhances hydrodynamic efficiency. The head is relatively large and deep, with a blunt and a terminal mouth that includes a wide gape and slightly protruding lower , adaptations suited to their predatory . The are robust, comprising a , a long and narrow that extends beyond the posterior eye margin, and a long dentary with a narrow horizontal blade; these structures support powerful biting action. Teeth are sharp, conical, and inwardly curved, arranged in two series on the (4-8 outer and 7-15 inner teeth) and dentary (16-29 primary teeth plus 53-58 inner conical teeth), with the second dentary tooth in the outer series notably larger than others. The fin configuration includes a homocercal caudal that is moderately forked, providing strong propulsion; a with ii+9 rays, positioned posteriorly with its origin approximately midway between the snout tip and hypural joint; and a small adipose fin situated behind the . Pectoral fins are large and low-set, bearing i+12-16 rays to support agile maneuvering, while pelvic fins have i+7 rays. The body is covered in large scales, contributing to a streamlined profile. A well-developed , complete and uninterrupted, extends from the supracleithrum to the caudal-fin base along 68-102 pored scales, enabling sensitive detection of prey vibrations and water movements. Sexual dimorphism is subtle, with no extreme variations in body shape between sexes; however, mature males develop hooks on the branched rays of the pelvic and anal fins during breeding, while females tend to attain larger .

Size and coloration

Adults of the larger in the Salminus, such as S. brasiliensis and S. franciscanus, can reach lengths of 1.0–1.3 m total length (TL) and weights up to 30–34 kg. Smaller attain lesser maximum . Juveniles measure 10–30 cm in length, often exhibiting through coloration and form that resembles sympatric prey . Growth is rapid during the first 2–3 years, with high rates observed in the initial year due to abundant resources in riverine environments, before slowing after around 38 cm in larger like S. brasiliensis. This pattern varies with habitat conditions, such as faster growth in free-flowing rivers compared to reservoirs. Coloration in Salminus undergoes ontogenetic shifts, with juveniles displaying a silvery body accented by dark spots, aiding in camouflage and mimicry of prey like Astyanax species. Adults develop iridescent golden-yellow flanks, earning the common name "dorado," with a yellowish ground color and longitudinal scale rows enhancing the metallic sheen. During breeding, individuals exhibit intensified yellow-gold hues and reddish reflections on the body and fins, though sexual dichromatism is minimal beyond these temporary enhancements. Color intensity can diminish under or in captive conditions, leading to paler or faded golden tones compared to wild specimens. These variations underscore the genus's adaptability to environmental cues, with no pronounced differences between sexes outside of breeding periods.

Distribution and habitat

Geographic range

The genus Salminus is endemic to freshwater systems of , with its native range spanning major river basins from the northern Amazon and systems to the southern Paraná, , and São Francisco basins. This distribution encompasses tropical and subtropical zones, extending latitudinally from approximately 0° to 35°S, reflecting the genus's adaptation to warm-water riverine environments across the continent. The species occur in multiple countries, including , , , , , , , and , with S. brasiliensis exhibiting the broadest extent across the La Plata system and adjacent drainages. While the overall historical range remains largely intact without evidence of major basin-wide contractions, local extirpations have occurred in portions of some rivers due to hydroelectric dams that fragment habitats and impede migrations. Introduced populations of S. brasiliensis have been documented and established in non-native basins in , such as the Iguaçu, Doce, and do Sul rivers. Endemism is notable at the species level, with certain taxa restricted to specific basins; for example, S. franciscanus is confined to the São Francisco River basin in eastern . Similarly, S. affinis occurs in the Magdalena River basin in and the Santiago River basin in .

Habitat preferences

Salminus species primarily inhabit large, flowing rivers featuring strong currents and high oxygen levels, favoring lotic environments over lentic ones. These avoid stagnant waters such as lakes, instead seeking dynamic river systems where water flow supports their predatory lifestyle and migration patterns. Within these rivers, Salminus prefers microhabitats including deep pools, , waterfalls, and areas, particularly along riverbanks and ravines that provide cover and prey abundance. is critical, with typical conditions encompassing temperatures of 24–30 °C, pH around 7.4, and elevated dissolved oxygen concentrations above 5 mg/L to sustain their metabolic demands. They tolerate clear to turbid waters depending on seasonal flow variations but exhibit low tolerance to non-ionized levels exceeding 0.58 mg/L, which can rapidly increase mortality in juveniles. Seasonally, Salminus migrates to flooded floodplains during rainy periods (typically October to March) to exploit increased feeding opportunities in expanded habitats. These movements highlight their sensitivity to environmental disruptions, including and , which degrade and fragment habitats, often leading to population declines. Such preferences underscore their role as indicators of river ecosystem health.

Biology and ecology

Diet and feeding

Salminus species are predominantly piscivorous, with adult individuals relying almost exclusively on smaller as their primary source. Common prey includes characins such as Leporinus sp., sp., and Steindachnerina insculpta, which constitute the bulk of the diet year-round, though consumption of additional species like Astyanax bimaculatus increases during the rainy season when prey availability rises. Opportunistic feeding on crustaceans and has also been documented, particularly supplementing the diet in certain habitats. Feeding behavior in Salminus reflects their role as predators in riverine ecosystems, where they utilize powerful bursts of speed and precise strikes to capture elusive prey, often from concealed positions near structures or current breaks. These exhibit diurnal activity patterns, with feeding intensity peaking during periods of higher prey mobility, such as dawn and , and showing marked seasonal variation—higher during the rainy/hot season (–December) due to increased floodplains and prey dispersion, and lower in the when up to 72% of stomachs may be empty. Ontogenetic shifts in diet are evident across life stages: In the wild, larvae primarily consume and , while juveniles have a more varied diet including and small , transitioning to a nearly exclusive piscivorous regime as adults. This progression aligns with their growth into larger sizes, where smaller predators (28–49 cm) incorporate more diverse prey, while larger individuals focus on high-volume targets like Leporinus sp. As apex predators in Neotropical river systems, Salminus occupy a high of approximately 3.8, exerting top-down control on prey populations through their predatory pressure. Their non-protrusible jaws, equipped with single rows of sharp, recurved teeth on the and , are specialized for impaling and slicing prey, enabling efficient capture and retention during high-speed pursuits.

Reproduction and migration

Species of the genus Salminus reach at lengths ranging from 23 to 55 cm, depending on the species, sex, and local conditions. For instance, in S. brasiliensis, females attain maturity at an average of 55 cm, while males mature at around 32-35 cm. Reproduction occurs through during the rainy season, typically from October to March, with peaks in November and December for S. brasiliensis. Spawning takes place in shallow, vegetated areas or open waters, where non-adhesive eggs are released and drift with the current to backwaters and lagoons formed by floods. These species exhibit a total spawning pattern, releasing all mature eggs in a single event per season, though some evidence suggests potential for batch spawning in multiple pulses influenced by rainfall. is high, with females producing 160,000 to 440,000 eggs per spawning event. Salminus species are potamodromous, undertaking upstream migrations to headwater regions for spawning, with distances reaching up to 1,000 km in S. brasiliensis. These migrations are triggered by rising water levels and floods during the rainy season, facilitating access to suitable spawning grounds. There is no , leaving eggs and larvae vulnerable to high mortality from predation and environmental factors.

Species

List of species

The genus Salminus comprises six valid species, with no recognized subspecies, according to the most recent taxonomic revision.
Scientific nameAuthority and yearCommon name
Salminus affinisSteindachner, 1880Colombian dorado
Salminus brasiliensis(Cuvier, 1816)Golden dorado (type species)
Salminus franciscanusLima & Britski, 2007São Francisco dorado
Salminus hilariiValenciennes, 1850Argentine dorado
Salminus iquitensis(Nakashima, 1941)Iquitos dorado
Salminus santosiLima, 2022Tocantins dorado

Species distinctions

Salminus species exhibit notable variations in maximum size, with S. brasiliensis reaching up to 1.4 m in total length, making it the largest in the genus, while S. santosi and S. iquitensis are among the smallest at maxima of approximately 20 cm and 25 cm standard length, respectively. Other species, such as S. franciscanus and S. hilarii, attain maximum lengths of approximately 93 cm and 50 cm standard length, respectively, reflecting adaptations to different predatory roles within their habitats. S. affinis reaches up to 46 cm standard length. Morphological distinctions aid in species identification, particularly in and pigmentation patterns; for instance, S. affinis features a characteristic dark post-orbital stripe absent in S. franciscanus, and S. franciscanus possesses a second dentary tooth in the outer row, similar to S. brasiliensis but differing from other congeners. proportions also vary, with S. hilarii exhibiting a more protrusible mouth suited to its feeding strategy compared to the relatively fixed in S. affinis. These traits, combined with scale counts and fin positions, highlight the genus's diversity despite shared features like golden flanks. S. iquitensis and S. santosi are distinguished by smaller body sizes and specific patterns, such as reduced tooth counts and unique pigmentation on fins, as detailed in the 2022 revision. Distributional ranges show significant overlap and endemism; S. brasiliensis is widespread across the Paraná, , and basins, often co-occurring with S. hilarii, whereas S. franciscanus is strictly endemic to the São Francisco River basin in . S. affinis is primarily found in the and upper Amazon systems, with limited overlap with S. brasiliensis in certain tributaries. S. iquitensis occurs in the western Amazon and basins, while S. santosi is endemic to the basin. Ecological niches differ in habitat preferences, in contrast to the rheophilic tendencies of S. brasiliensis and S. franciscanus, which thrive in fast currents and rapids for ambush predation. Conservation challenges vary across species, with S. hilarii facing heightened threats from hydroelectric dams that fragment migration routes and alter spawning habitats, leading to its classification as "almost threatened" in regions like São Paulo State, Brazil. In comparison, S. brasiliensis experiences broader pressures from overfishing but maintains a least concern status due to its extensive range, while endemics like S. franciscanus are vulnerable to localized dam impacts in the São Francisco basin.

Conservation and human use

Fisheries and angling

Salminus species, particularly S. brasiliensis, support commercial fisheries in Brazil, Argentina, and Paraguay, where they are harvested primarily for human consumption. These fisheries target the species in major river basins like the Paraná and Paraguay, using hook-and-line methods for subsistence and commercial purposes. In 2006, approximately 850 tons of S. brasiliensis were commercialized across its native range, highlighting its economic value as a dominant catch species. However, in Argentina, commercial fishing for S. brasiliensis has been permanently banned since 1982 due to population concerns, though illegal harvesting and trade continue, representing about 21% of reported fisher activity in the Paraná River. Recreational for Salminus, especially the golden dorado (S. brasiliensis), has gained international prominence as a fly-fishing target, often dubbed "South America's " for its powerful, acrobatic fights that can last 15 to 30 minutes. Anglers employ heavy-duty gear, including 8- to 10-weight fly rods and strong leaders, to handle specimens reaching up to 30 kg in rivers like the Paraná, , and Juramento. In , fishing below the Salto Grande Dam is strictly regulated, permitting only four boats (two per country) for four days weekly, fostering sustainable catch-and-release practices. Tournaments and guided trips in and Uruguay attract enthusiasts, with remote areas like the Juramento River emerging as key destinations for sight-fishing in clear waters. Aquaculture efforts for Salminus have met limited success owing to the species' migratory and high rates among juveniles, complicating intensive rearing. In , hatchery programs focus on repopulation and genetic monitoring using RAPD markers to support wild stocks in rivers like the São Francisco, though ecological risks from persist. A recent initiative by Itaipu Binacional, launched in January 2025, tests net-cage production with biofloc systems, starting with 6,000 juveniles to develop sustainable chains and alleviate wild harvest pressure, aiming for market-size (1 kg) within one year. has contributed to localized population declines, underscoring the need for balanced utilization.

Conservation status

Salminus species face multiple anthropogenic threats that have contributed to population declines across their ranges in South American river basins. due to the construction of large dams, such as the on the , disrupts migratory routes and spawning grounds essential for these potamodromous fishes. , particularly through commercial and recreational exploitation, has led to reduced stock sizes, with reports indicating vulnerability in several basins. from agricultural runoff, industrial effluents, and activities further degrades and suitability. Additionally, exacerbates these pressures by altering flood regimes critical for reproduction and juvenile dispersal. According to the , is classified as Least Concern, assessed in 2020, reflecting its wide distribution but ongoing localized declines. Salminus franciscanus, endemic to the basin, is also rated Least Concern as of 2018, though regional studies highlight its endangered status due to and habitat loss. Salminus affinis is listed as in 2023, owing to insufficient on its trends in the basin. Salminus hilarii receives a Least Concern designation from 2020, but populations in the upper and Amazon basins show signs of near-threatened conditions from fragmentation. Conservation efforts include the establishment of protected areas within the and Paraná basins to safeguard critical habitats and migration corridors. In , fishing regulations such as minimum size limits (e.g., 60 cm for S. brasiliensis) aim to protect juveniles and allow population recovery. Restocking programs have been implemented in some reservoirs to bolster depleted stocks, though their long-term efficacy remains under evaluation. Key research gaps persist, including the need for comprehensive genetic studies to assess population structure and connectivity in fragmented rivers. Monitoring the impacts of developments on migration patterns is also critical, as dams continue to isolate upstream and downstream populations. The genus Salminus exhibits historical diversity loss, with Miocene fossils from indicating an extinct species from the early (Tortonian stage, approximately 7-11 million years ago), suggesting past environmental changes reduced lineage persistence.

References

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