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Electric eels are not actually eels, but neotropical freshwater fish from South America. They are the only members of the subfamily Electrophorinae and are known for their ability to generate electricity, stunning their prey with shocks of up to 860 volts. Despite their name, electric eels are more closely related to carp and catfish than to true eels. They are also not jawless, unlike hagfish and lampreys, which are the only known living jawless fish. Hagfish are eel-shaped and are the only known living animals with a skull but no vertebral column.
| Characteristics | Values |
|---|---|
| What is an electric eel? | A genus of neotropical freshwater fish from South America |
| Scientific name | Electrophorus |
| Family | Gymnotidae |
| Subfamily | Electrophorinae |
| Ability | Can stun prey by generating electricity |
| Electric shocks | Up to 860 volts |
| Nocturnal | Yes |
| Diet | Fish, amphibians, birds, small mammals, insects, crustaceans, and invertebrates |
| Vision | Poor |
| Hearing | Yes, via a Weberian apparatus |
| Hagfish | A group of jawless fish |
| Lamprey | A group of jawless fish |
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What You'll Learn
Electric eels are not true eels
One key difference lies in their skeletal structure. True eels belong to the order Anguilliformes, which are characterized by having long, snake-like bodies and a cartilaginous skeleton. In contrast, electric eels belong to the order Gymnotiformes, which are known for their elongated, compressed bodies and a more well-developed skeletal system.
Another distinguishing factor is their habitat and behavior. True eels are typically marine creatures, spending most of their lives in the ocean and returning to freshwater only for spawning. They are also known for their catadromous migration, moving between saltwater and freshwater environments. Electric eels, on the other hand, are exclusively freshwater residents and are native to South America. They prefer stagnant or slow-moving waters, such as marshes, swamps, and quiet river margins.
The most notable distinction, however, lies in their ability to generate electricity. Electric eels have three pairs of abdominal organs that are modified into electric organs, allowing them to produce a powerful electric discharge. These organs comprise most of the eel's body and are used for stunning prey, defense, and navigation in murky waters. True eels do not possess these electric organs or the capacity to generate electricity.
Additionally, electric eels have a more rounded tail compared to the pointed tail of true eels. Their diet also differs, with electric eels primarily feeding on small fish and invertebrates, while true eels are more opportunistic and may feed on a wider variety of prey, including crustaceans, mollusks, and even small aquatic mammals.
Finally, their reproductive strategies differ significantly. True eels have a complex life cycle, with a long larval stage and a remarkable transformation from transparent larvae to the adult form. Electric eels have a more typical reproduction process, with external fertilization and a shorter larval stage. These differences further emphasize the distinct evolutionary paths of electric eels and true eels.
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Hagfish are the only known living animals with a skull but no vertebral column
Hagfish, of the class Myxini (also known as Hyperotreti), are eel-shaped jawless fish. They are the only known living animals with a skull but no vertebral column, although they do have rudimentary vertebrae. Hagfish are marine predators and scavengers that can defend themselves against larger predators by releasing copious amounts of slime from mucous glands in their skin.
Hagfish are in the group Cyclostomata, which includes jawless fish. The group is characterised by two significant characteristics: keratinous tooth plates and the movement of postotic myomeres to the orbitals. According to fossil records, hagfish and lampreys diverged from one another during the Paleozoic period.
The oldest-known stem group hagfish are from the Late Carboniferous, around 310 million years ago, with modern representatives first recorded in the mid-Cretaceous around 100 million years ago. Molecular evidence from the early 1990s suggests that lampreys and hagfish are more closely related to each other than to gnathostomes. Hagfish possess gonadotropins that secrete from pituitary glands to the gonads to stimulate development, indicating an early version of the hypothalamic-pituitary-gonadal axis, previously thought exclusive to gnathostomes.
Hagfish have a biting apparatus that is not considered to have been derived from gill arches. They have a pair of horizontally moving structures with tooth-like projections for pulling off food. The circulatory systems of hagfish have both closed and open blood vessels, with a heart system resembling that of some worms. They have paddle-like tails, cartilaginous skulls, and tooth-like structures composed of keratin.
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Lampreys are a group of jawless fish
Electric eels are not closely related to true eels (Anguilliformes). They are neotropical freshwater fish from South America and are the only members of the subfamily Electrophorinae. They are known for their ability to stun prey by generating electricity, delivering shocks of up to 860 volts.
Lampreys, on the other hand, are a group of jawless fish comprising the order Petromyzontiformes, the sole order in the class Petromyzontida. They are characterised by a toothed, funnel-like sucking mouth. The name "lamprey" is derived from the Latin "lampetra", meaning "stone licker". They are classified into three families: two small families in the Southern Hemisphere (Geotriidae and Mordaciidae) and one large family in the Northern Hemisphere (Petromyzontidae).
Lampreys are closely related to hagfish, another group of jawless fish. Together, they form the superclass Cyclostomi. Lampreys are considered important for studies of vertebrate evolution, as they are the only living sister group of jawed vertebrates. They possess unique anatomical features, such as a muscularized pharyngeal pouch, that may have been present in primitive vertebrates. Lampreys have been described as the only living vertebrates with four eyes, including a single pair of regular eyes and two parietal eyes.
Lampreys have a unique feeding mechanism. They attach their mouthparts to their prey and use horny plates on their piston-like tongue to scrape through surface tissues to reach body fluids. Some species feed on both blood and flesh, while others specialise in flesh and may invade the internal organs of their host. Lampreys exhibit countershading, a form of camouflage where their dark-coloured backs blend in with the ground when viewed from above.
In conclusion, electric eels are not jawless fish, but rather a type of knifefish. Lampreys, on the other hand, are a distinct group of jawless fish with unique anatomical, behavioural, and evolutionary characteristics that make them an important subject of study in vertebrate evolution.
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Electric eels are obligate air-breathing animals
About every two minutes, the fish takes in air through its mouth, holds it in the buccal cavity, and expels it through the opercular openings at the sides of its head. Unlike other air-breathing fish, the tiny gills of electric eels do not ventilate when taking in air. Instead, the majority of the carbon dioxide produced is expelled through the skin. Due to this, electric eels can survive on land for several hours if their skin is wet enough.
The mouth of the electric eel is structurally adapted for air breathing by an extensively diverticulated and richly vascularized oral mucosa. The mouth has folds that increase the surface area, allowing the fish to breathe air rather than trying to meet its respiration needs through gills in warm, anoxic waters.
Electric eels are nocturnal, and their poor vision is complemented by electrolocation. They are able to locate their prey using electroreceptors derived from the lateral line organ in the head. The lateral line canals are beneath the skin, but their position is visible as lines of pits on the head.
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Electric eels are top predators
Electric eels are not true eels, but rather neotropical freshwater fish from South America. They are the only members of the subfamily Electrophorinae, and they were first described by Carl Linnaeus in 1766. They are known for their ability to stun prey by generating electricity, with discharges of up to 860 volts.
The electric eel's body contains electric organs with about 6,000 specialized cells called electrocytes that store power like tiny batteries. When threatened or attacking prey, these cells discharge simultaneously, delivering a powerful shock. This ability to generate electricity also allows them to navigate and locate prey through electrolocation, as they have poor vision.
Electric eels have been observed engaging in social predation, where groups of over 100 eels work together to herd small fish into a "prey ball" before launching joint strikes. This behaviour may be related to the complex behavioural sequence involved in solitary hunting, which includes prey detection, stunning, and the use of dipole attacks to subdue difficult prey.
In conclusion, electric eels are top predators that use their electrical capabilities to their advantage in both hunting and protection against other predators. Their ability to generate powerful electric shocks, coupled with their social predation strategies, makes them formidable predators in their aquatic ecosystems.
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Frequently asked questions
No, an electric eel is not a jawless fish. Hagfish and lampreys are examples of jawless fish.
An electric eel is a neotropical freshwater fish from South America. It is a top predator and is known for its ability to stun its prey by generating electricity.
Electric eels have long, cylindrical bodies with flattened heads and no pelvic fins. Their thick, scaleless skin is generally dark grey to brown, and their undersides are yellow-orange.
