Beatrice Lang
Electric eels are a genus of neotropical freshwater fish from South America. They are known for their ability to stun their prey by generating electricity, delivering shocks of up to 860 volts. The electric eel generates large electric currents through a highly specialized nervous system that synchronizes the activity of disc-shaped, electricity-producing cells. This allows the eel to produce a short-lived current flowing along its body, which can be as high as 500 volts in air. However, due to the conductivity of water, eels generate a larger voltage in their natural habitat. This high-voltage discharge is used to stun prey and defend against potential threats.
| Characteristics | Values |
|---|---|
| Maximum discharge | 600 volts or more |
| Voltage when anesthetized | Never goes down to zero, but lower than usual |
| Voltage threshold for safety | 20 volts |
| Voltage discharge | Up to 860 volts |
| Voltage discharge compared to power outlet | Less dangerous, as power outlet shock can be 10 or 20 amps |
| Voltage discharge compared to other animals | Highest of any known animal |
| Voltage discharge in pulses | Yes |
| Voltage discharge in pulses vs time between pulses | Shorter duration than time between each pulse |
| Voltage discharge frequency | As many as 400 per second |
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What You'll Learn
- Electric eels can produce up to 860 volts of electricity
- The eel's nervous system synchronises the activity of electricity-producing cells
- Electric eels can deliver shocks of high voltage but low amperage
- Freshwater fish require a high voltage to give a strong shock
- Electric eels can generate a series of high-voltage pulses to paralyse prey
Electric eels can produce up to 860 volts of electricity
Electric eels are a genus of neotropical freshwater fish from South America, known for their ability to stun prey by generating electricity. They are not true eels but are members of the knifefish family, more closely related to catfish. In 2019, three species of electric eels were identified, one of which, Electrophorus varii, can discharge up to 860 volts, making it the most powerful of all electric fishes.
Electric eels generate large electric currents through a specialized nervous system that synchronizes the activity of disc-shaped, electricity-producing cells in an electric organ. Each cell carries a negative charge on its outside compared to its inside. When a command signal arrives from the brain, a neurotransmitter is released, creating a path with low electrical resistance and activating the electric organ. The main organ and Hunter's organ are rich in the protein calmodulin, which helps regulate the voltage-gated sodium channels that create the electrical discharge.
The electric eel's high-voltage discharge is not necessarily dangerous to humans as it is low amperage (approximately 1 amp). In comparison, a shock from a power outlet can be 10 to 20 amps. The severity of an electric shock depends on the amount and duration of the current flowing through a given area. The electric eel's current is divided and diminished by the water it lives in, which provides additional outlets for the current.
Electric eels use their electric pulses for hunting and defense in the dark and murky waters they inhabit. They emit two rapid electric pulses, called a doublet, which causes the prey's muscles to twitch, alerting the eel to its presence. The eel then paralyzes and consumes its prey with a series of high-voltage pulses, as many as 400 per second.
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The eel's nervous system synchronises the activity of electricity-producing cells
Electric eels are a genus of neotropical freshwater fish from South America, known for their ability to stun prey and defend themselves by generating electricity. They can deliver shocks of up to 860 volts, making them the most powerful of all electric fishes.
Electric eels have three pairs of electric organs: the main organ, Hunter's organ, and Sachs' organ. These organs enable eels to generate two types of electric discharges: low voltage and high voltage. The organs are made up of disc-shaped, electricity-producing cells called electrocytes, which are modified muscle cells. The electrocytes contain various proteins, including actin and different forms of desmin, arranged in a loose network structure.
The eels' nervous system plays a crucial role in synchronising the activity of these electricity-producing cells. When an electric eel identifies prey, its brain sends a nerve signal to the electric organ. This nerve signal triggers the release of the neurotransmitter acetylcholine, which stimulates an electric organ discharge. The release of acetylcholine creates a transient pathway with low electrical resistance, allowing the flow of sodium ions into the electrocytes and momentarily reversing the polarity.
The simultaneous activation of thousands of electrocytes by the nervous system is essential for generating a powerful electric current. This synchronisation ensures that all the cells activate at once, regardless of their distance from the command nucleus. Each electrocyte carries a negative charge on its outer surface compared to its inside. When the nerve signal reaches the electrocyte, it releases acetylcholine, creating a transient pathway for the flow of ions and facilitating the generation of an electric current.
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Electric eels can deliver shocks of high voltage but low amperage
Electric eels are a genus of neotropical freshwater fish from South America. They are known for their ability to stun their prey by generating electricity, delivering shocks of up to 860 volts. This makes them the most powerful of all electric fishes. Despite their name, electric eels are not true eels but are, in fact, a species of knifefish, more closely related to catfish and carp.
Electric eels have a highly specialized nervous system that can synchronize the activity of disc-shaped, electricity-producing cells packed into a specialized electric organ. This allows them to generate large electric currents. The nervous system has a command nucleus that decides when the electric organ will fire, activating thousands of cells simultaneously. Each electrogenic cell carries a negative charge of about 100 millivolts on its outside compared to its inside.
The electric eel's high-voltage shocks are the result of its specialized organs and proteins. The main organ and Hunter's organ are rich in the protein calmodulin, which helps control calcium ion levels. Calmodulin and calcium regulate voltage-gated sodium channels to create an electrical discharge. The main organ can discharge at least 600 volts, while the maximum discharge of Sachs's organ is unknown, but it is believed to be lower.
While electric eels produce high-voltage shocks, the amperage is low, at approximately 1 amp. This is because the electric current is divided and diminished by the water in which they live. As a result, the shocks are not necessarily dangerous to humans. The severity of an electric shock depends on the amount and duration of the current flowing through a given area, so the small animals that the eels prey on receive a much larger shock proportionally.
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Freshwater fish require a high voltage to give a strong shock
Electric eels are a genus of neotropical freshwater fish from South America, known for their ability to stun prey by generating electricity. They can produce an electric shock of up to 860 volts, making them the most powerful of all electric fishes. This high voltage is necessary to deliver a strong shock in freshwater due to the high resistance of this type of water.
The electric eel has a highly specialized nervous system that can synchronize the activity of disc-shaped, electricity-producing cells packed into its electric organ. Each of these cells carries a negative charge on its outside compared to its inside. When the eel's brain identifies prey, it sends a nerve signal to the electric organ, releasing the neurotransmitter acetylcholine to trigger an electric organ discharge. This opens ion channels, allowing sodium to flow into the electrocytes and creating an electric current.
The electric eel's high-voltage discharge is not necessarily dangerous to humans. This is because, despite the high voltage, the amperage is low (approximately 1 amp). In comparison, a shock from a power outlet typically has 10 to 20 amps, which can be lethal. The severity of an electric shock depends on the amount and duration of the current flowing through a given area.
Additionally, the electric eel's current only affects small animals close to it, rather than the eel itself. This is because the current discharged into a smaller body is much larger proportionally. For example, a prey item ten times smaller in length than an eel is about 1,000 times smaller in volume, so it receives a much larger current.
The electric eel's ability to generate high voltages has been studied for centuries, contributing to the invention of the electric battery. Today, researchers continue to explore the origin and production of strong electric discharges in this unique freshwater fish.
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Electric eels can generate a series of high-voltage pulses to paralyse prey
Electric eels are a genus of neotropical freshwater fish from South America, known for their ability to stun prey by generating electricity. They are not true eels but are a species of knifefish, more closely related to catfish and carp. Electric eels were first studied in 1775, and these studies contributed to the invention of the electric battery in 1800.
Electric eels can generate a series of high-voltage pulses to paralyse their prey. They can produce up to 860 volts of electricity, making them the most powerful of all electric fishes. The eel emits two rapid electric pulses, known as a doublet, when it suspects prey is nearby. This doublet causes the prey's muscles to twitch involuntarily, alerting the eel to its presence. The eel then delivers a series of high-voltage pulses, as many as 400 per second, to paralyse its prey before consuming it.
The electric eel's nervous system is highly specialised, allowing it to synchronise the activity of disc-shaped, electricity-producing cells packed into its electric organ. The thousands of cells activate simultaneously, creating a large electric current. Each cell carries a negative charge of slightly less than 100 millivolts on its outside compared to its inside. When a nerve signal arrives, a neurotransmitter chemical is released, creating a path with low electrical resistance and allowing sodium to flow into the cell, generating an electric current.
The high voltage of the electric eel's shock is due in part to the high resistance of freshwater. The electric discharge of an eel in air would be equivalent to a 500-volt battery, but the voltage increases when the eel is in water, as water provides additional outlets for the current. The severity of an electric shock also depends on the amount and duration of the current flowing through a given area, which is why the eel's small prey receives a proportionally larger shock than the eel itself.
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Frequently asked questions
Electric eels can produce voltage up to 860 volts, making them the most powerful of all electric fishes.
Electric eels have a highly specialized nervous system that synchronizes the activity of disc-shaped, electricity-producing cells packed into a specialized electric organ. This allows them to generate large electric currents.
While electric eels can produce high voltages, they are not necessarily dangerous to humans. The discharge is high voltage but low amperage (around 1 amp), and the severity of an electric shock depends on the amount and duration of the current. Additionally, water can dilute the current, reducing the potential harm.
