Amazon Eels
The Shocking Predators and Subterranean Serpents of the Amazon
Amazon Eels
The Shocking Predators and Subterranean Serpents of the Amazon
Guide
The rivers and floodplains of the Amazon are home to some of the strangest and most elusive fish on Earth—including two highly specialized eel-like species that couldn’t be more different. The notorious electric eel (Electrophorus electricus) is one of the few freshwater fish capable of generating powerful electric shocks, while the swamp eel (Synbranchus spp.), also known as the "water snake" or "mussu," is a primitive air-breathing predator known for disappearing into the mud or hiding inside hollow logs. Both are enigmatic, uniquely adapted for their environments, and highly respected by local fishermen—not necessarily for sport, but for their survival abilities and unusual behavior.
Though neither species is a classic Amazon gamefish like the peacock bass or payara, they’re a fascinating part of the region’s ecosystem. The electric eel is feared for its ability to incapacitate prey (and the occasional barefoot wader), while the swamp eel impresses with its ability to burrow into the earth and survive in oxygen-poor backwaters. Whether you're exploring blackwater lagoons or floodplain channels, encountering one of these elusive creatures is always memorable.
Interesting Facts & Notes
Electric eels can produce shocks of up to 600 volts and are capable of stunning prey from a distance.
Swamp eels are air-breathers and can survive for long periods in burrows during the dry season.
Neither species has scales, and both feature long, serpentine bodies that make them difficult to handle.
Indigenous groups use knowledge of these species for survival, sometimes harvesting eels from burrows or using their electric shocks to avoid danger.
Where to Catch
These elusive predators inhabit slow, vegetated waters and submerged structures. While rarely targeted directly, they may be encountered on the following trips:
Rio Aripuanã - Found in backwaters, oxbows, and vegetated creek mouths
Xingu River - Occasionally encountered near submerged timber and slow tributaries
Floating Bungalows - Sometimes found in dark, tannin-stained lagoons with heavy cover
Quick Facts
| Attribute | Electric Eel (E. electricus) | Swamp Eel (Synbranchus spp.) |
|---|---|---|
| Scientific Name | Electrophorus electricus | Synbranchus marmoratus (most common) |
| Common Names | Poraquê, electric eel | Mussum, swamp eel, water snake |
| Size Range | Up to 2.5 meters; 4–5 kg | Up to 1.5 meters; ~2 kg |
| Region | Amazon Basin, north Brazil | Widespread in Brazilian basins |
| Habitat | Muddy bottom waters, pools, submerged root systems | Shallow lakes, marshes, burrows |
| Behavior | Solitary, crepuscular/nocturnal, capable of electric discharge | Burrowing, secretive, air-breathing |
| Coloration | Dark olive to brown, with lighter underbelly | Brown to black, often with speckled patterns |
| Aggression | High—especially when threatened | Moderate—defensive when cornered |
| Feeding Habits | Carnivore—feeds on fish, amphibians, crustaceans | Carnivore—feeds on fish, worms, insects |
| Gamefish Status | Rarely targeted intentionally | Not considered a gamefish |
Physical Appearance
Electric eels have long, cylindrical bodies with thick, slimy skin and no scales. Their heads are slightly flattened, with a blunt snout and small eyes. A faint orange glow often marks their undersides. They lack dorsal and pelvic fins, relying entirely on an extended anal fin for propulsion.
Swamp eels are equally serpentine but even more elongated and tapering at both ends. Their bodies are smooth and slippery, with small or absent eyes and extremely reduced fins. They resemble a cross between a snake and a fish, perfectly adapted to slither through mud and submerged vegetation.
How to Identify
Electric Eel (Poraquê):
Large, thick-bodied fish with blunt snout and powerful electric organs
Small eyes, long anal fin, dark brown coloration with orange tint
Usually found motionless or cruising near the bottom
Swamp Eel (Mussum):
Slender, eel-like fish with small eyes and pointed snout
No visible fins apart from small dorsal and ventral ridges
Often hidden in mud, tree roots, or submerged debris
Fishing Tactics: How to Catch Amazon Eels
While these fish are rarely targeted for sport, anglers occasionally encounter them while fishing for other Amazon species. Swamp eels may take baits left near structure, while electric eels are often caught inadvertently on cut bait. Extreme caution is required with either species, both for handling and for ethical reasons. The poraquê in particular is dangerous and must be subdued before handling. Swamp eels are strong escape artists and will retreat into holes or snags.
Recommended Techniques
Use cut bait or worms on the bottom near heavy structure
Fish at night or early morning, especially in backwater lagoons
For swamp eels, drop bait near submerged logs or undercut banks
Suggested Gear
Light to medium rods (swamp eel), medium-heavy rods (electric eel)
20–40 lb braided line
Circle hooks (3/0–6/0) for easy release
Rubber-grip pliers for handling, wooden fork to subdue electric eel
Related Reading
Join The Adventure
While poraquê and mussum may not be your primary targets, encountering these incredible creatures is part of what makes an Amazon fishing trip unforgettable. Join us for a South America fishing adventure where the unexpected is always part of the journey.
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References
Campos-da-Paz, R. (2003). Electrophorus electricus diagnostic.
Lima, F. C. T., et al. (2005). Swamp eel morphology and behavior.
Assunção, M. & Schwassmann, H. (1995). Reproductive behavior of electric eel.
Britski, H. A., et al. (2007). Peixes do Pantanal field guide.
Giarrizzo, T. & Sousa, L. (2021). Peixes Fluviais do Brasil: Espécies Comuns da Ictiofauna Continental Brasileira.
Zeinad, A. K. & Prado, R. A. (2012). Peixes fluviais do Brasil: espécies esportivas.
