Trystan Casey
Electric eels are long, cylindrical fish with flattened heads that can deliver powerful electric shocks of up to 860 volts. They do this through a highly specialized nervous system that can synchronize the activity of disc-shaped, electricity-producing cells called electrocytes, which are packed into a specialized electric organ. The electrocytes are arranged like stacks of batteries, and the rapid transfer of sodium ions along their length generates an electric current. The electric organ and Hunter's organ produce strong electric shocks that can ward off predators or stun prey, while the Sach's organ and the other half of the Hunter's organ produce weak electric impulses that help the eels navigate, seek out prey, and communicate with one another.
| Characteristics | Values |
|---|---|
| How do electric eels generate electricity? | Electric eels have special cells called electrocytes that are located in their electric organs. These electrocytes are arranged like stacks of batteries and produce electricity through a chemical reaction. |
| How do they deliver shocks? | The electric eel's nervous system synchronizes the activity of these electricity-producing cells, causing them to activate simultaneously and create a powerful electric current. |
| How strong are the electric shocks? | The strength of the electric shocks varies depending on the organ producing the charge. The main organ and part of the Hunter's organ can produce strong electric shocks of up to 600-860 volts, while the Sach's organ and the other half of the Hunter's organ produce weaker electric impulses. |
| What are the functions of these electric shocks? | The strong electric shocks can be used to ward off predators or stun prey. Weaker electric impulses are used for navigation, hunting, and communication with other electric eels. |
| Why don't electric eels shock themselves? | There are a few possible explanations. One is that the severity of an electric shock depends on the amount and duration of the current flowing through a given area of the body. Since the prey is much smaller than the eel, they receive a proportionally larger current. Additionally, the electric organ is located at the end of the eel's body, far from the brain, and may be insulated by layers of fat. |
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What You'll Learn
- Electric eels have electricity-producing cells called electrocytes
- These cells are arranged like stacks of batteries in their electric organ
- The eel's nervous system can synchronise the electrocytes to produce a powerful electric shock
- The eel's size and fat layers may also prevent it from shocking itself
- Electric eels can leap out of the water to shock predators
Electric eels have electricity-producing cells called electrocytes
Electric eels are long, cylindrical fish with flattened heads. They are not 'true' eels but belong to the order Gymnotiformes, also known as knifefishes, and are closely related to catfishes and carp. They are found in the freshwater of the Amazon and Orinoco rivers of northern South America.
Each electrogenic cell carries a negative charge of a little less than 100 millivolts on its outside compared to its inside. When the command signal arrives, the nerve terminal releases acetylcholine, a neurotransmitter, creating a transient path with low electrical resistance connecting the inside and outside of one side of the cell.
The rapid transfer of sodium ions along the length of the electrocytes generates an electrical current at either high or low voltage, depending on the organ producing the charge. The main organ and part of the Hunter's organ produce strong electric shocks that can ward off predators or stun prey. The Sach's organ and the other half of the Hunter's organ produce weak electric impulses to navigate, seek out prey, and signal one another for courtship during the breeding season.
The electric eel's body can become the equivalent of a 500-volt battery. However, as eels live in water, they generate a larger voltage but a divided and, therefore, diminished current. This may be why they are able to shock other animals without shocking themselves.
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These cells are arranged like stacks of batteries in their electric organ
Electric eels have three pairs of electric organs, arranged longitudinally: the main organ, Hunter's organ, and Sachs' organ. These organs are made of electrocytes, or electricity-producing cells, which are stacked in series, or longitudinally, in the eel's electric organ.
The electric eel's electrocytes are disc-shaped, modified muscle cells that contain the proteins actin and desmin. In electrocytes, these proteins form a loose network of fibrils, as opposed to the dense, parallel structure found in muscle cells. The electrocytes are connected to each other and work together to generate a substantial shock.
Each electrocyte produces a small voltage, but when thousands of them are arranged in a row, they can produce a powerful electric current. This is similar to how a battery works, with each electrocyte contributing a small amount of electricity to create a larger total output. The eel's electric organ contains about 35 stacks of electrocytes on each side of its body, with each stack containing around 6,000 electrocytes.
The electric eel's nervous system plays a crucial role in activating these electrocytes. When the command is given, a complex array of nerves ensures that all the electrocytes activate simultaneously, creating a short-lived but powerful electric current. This process is highly specialized and has inspired the design of soft batteries and artificial electric organs.
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The eel's nervous system can synchronise the electrocytes to produce a powerful electric shock
Electric eels have a highly specialised nervous system that can synchronise the activity of disc-shaped, electricity-producing cells called electrocytes. These electrocytes are packed into a specialised electric organ, which contains around 6,000 electrocytes in series, with 35 such stacks in parallel on each side of the eel's body.
The nervous system utilises a command nucleus to decide when the electric organ will fire. Upon receiving the command signal, the eel's nerve terminal releases acetylcholine, a neurotransmitter. This creates a transient path with low electrical resistance, connecting the inside and outside of one side of the cell. This process opens ion channels, allowing sodium to flow into the electrocytes and reversing the polarity momentarily. The discharge is terminated by an outflow of potassium ions through a separate set of ion channels.
The synchronisation of electrocytes allows the electric eel to release a powerful electric shock of up to 860 volts. This shock is produced extremely rapidly, at a rate of up to 500 Hertz, with each shock lasting only about two milliseconds. The eel's body acts as a battery, with the electrocytes stacked to produce a high total voltage output. The eel's ability to produce high-voltage, high-frequency pulses enables it to electrolocate rapidly moving prey.
The electric eel's nervous system plays a crucial role in synchronising the electrocytes to deliver a powerful electric shock, making it a fascinating example of nature's ingenuity.
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The eel's size and fat layers may also prevent it from shocking itself
Electric eels are long, cylindrical fish with flattened heads that can grow up to more than 2.5 meters in length. They possess a highly specialized nervous system that can synchronize the activity of disc-shaped, electricity-producing cells called electrocytes, which are packed into a specialized electric organ. This electric organ takes up about 80% of the eel's body and allows them to produce electric impulses of varying strengths.
The eel's size may play a role in preventing it from shocking itself. Due to their large size, the electric current produced is proportionally much smaller in relation to their body, so they may not feel the shock as strongly as smaller animals close to the eel, which get stunned. Additionally, the fat layers of electric eels could act as insulation, preventing the full force of the electric current from flowing through their vital organs, thus reducing the risk of self-electrocution.
It is important to note that electric eels do experience some level of self-shock, but it is brief and does not cause them harm. This is because the current generated is distributed over their entire body, and the duration is very short, so they don't feel it.
The electric eel's unique anatomy and physiology allow it to harness this powerful ability without shocking itself to a harmful degree. The electric organ is composed of thousands of electrocytes stacked like batteries, and when activated, they create a short-lived current flowing along the eel's body. This current is then further diminished by the water, which provides additional outlets for the current, resulting in a lower current flowing through the eel's body.
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Electric eels can leap out of the water to shock predators
Electric eels are long, cylindrical fish with flattened heads. They are not 'true' eels but are more closely related to catfishes and carp. They can grow to more than 2.5 metres in length.
Electric eels can, indeed, leap out of the water to shock predators. This behaviour was first observed by Prussian explorer and naturalist Alexander von Humboldt in 1800, and then again in 1807, but was not seen again for over 200 years. In his observations, Humboldt described how native fishermen in Venezuela would herd horses into pools containing electric eels. The eels would leap out of the water and attack the horses, and the fishermen could then safely capture the exhausted eels.
In recent experiments, scientists have been able to replicate this behaviour. They found that the eels would leap out of the water and press their chins against a partially submerged predator. This creates a powerful closed electrical circuit, preventing the electrical charge from dispersing into the water and instead delivering a highly powerful jolt to the predator.
The electric organ in an electric eel's body can produce electric impulses of different strengths. The main organ and part of the Hunter's organ produce strong electric shocks that can ward off predators or stun prey. The Sachs organ and the other half of the Hunter's organ produce weak electric impulses that the eels use to navigate, seek out prey, and signal to one another during the breeding season.
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Frequently asked questions
Electric eels produce electricity through a highly specialised nervous system that has the capacity to synchronise the activity of disc-shaped, electricity-producing cells called electrocytes. These cells are packed into a specialised electric organ.
Electric eels use electricity to ward off predators, stun prey, navigate, and communicate with other electric eels.
The power of the electric shocks of an electric eel depends on the organ producing the charge. The main organ and part of the Hunter's organ can produce strong electric shocks of up to 860 volts of electricity. The Sach's organ and the other half of the Hunter's organ produce weak electric impulses.
There are a few theories as to why electric eels don't get shocked by their own electricity. One is that the severity of an electric shock depends on the amount and duration of the current flowing through any given area of the body. Therefore, the small animals close to the eel get shocked, rather than the discharging eel itself. Another theory is that the electric organ is located at the end of the eel's body, a long way from the brain, and is insulated by layers of fat.
