Umair Gaines
Electric fish, though a minority, include both oceanic and freshwater species, and both cartilaginous and bony fish. Electric eels, for example, are a type of electric fish that can deliver electric shocks of up to 860 volts, making them the most powerful of all electric fishes. Electric fish produce their electrical fields from electric organs, which are made up of electrocytes, modified muscle or nerve cells specialized for producing strong electric fields. These organs are used for electrolocation, hunting, defence, and communication.
| Characteristics | Values |
|---|---|
| Definition | Electric fish produce their electrical fields from an electric organ. |
| Composition of electric organ | The electric organ is made up of electrocytes, modified muscle or nerve cells, specialized for producing strong electric fields. |
| Types of electric fish | Electric fish include both oceanic and freshwater species, and both cartilaginous and bony fishes. |
| Functions of electric organ | Locating prey, defence against predators, and signalling, such as in courtship. |
| Electric organ discharge | It starts when the fish's brain sends signals that release a neurotransmitter onto the electrocytes, allowing positively-charged sodium ions to enter and create an electric current. |
| Electric organ orientation | In most electric fish, the electric organs are oriented along the length of the body, usually along the tail. In some species, such as stargazers and torpedo rays, the electric organs are oriented along the dorso-ventral axis. |
| Electric organ location | The location varies by species. For example, skates have their electric organ in the tail, while electric catfish have it surrounding their body, and stargazers have it in their head. |
| Electric fish examples | Electric eel, torpedo ray, elephantnose fish, stargazers, and more. |
| Electric eel species | There are three known species in the genus Electrophorus: Electrophorus electricus, Electrophorus voltai, and one other. |
| Electric eel voltage | The maximum discharge from an electric eel is at least 600 volts, but some species can generate up to 860 V. |
| Nocturnal behaviour | Electric eels are nocturnal, air-breathing animals with poor vision, and they mainly eat fish. |
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What You'll Learn
- Electric fish include both oceanic and freshwater species, and can be either cartilaginous or bony
- Electric organs are made up of electrocytes, which are modified muscle or nerve cells
- Electric organs produce strong electric fields, which are used for electrolocation, hunting, defence, and communication
- Electric eels are the most powerful of all electric fishes, with a maximum discharge of at least 600 volts
- The electric organ discharge starts when the fish's brain releases a neurotransmitter onto the electrocytes, creating an electric current
Electric fish include both oceanic and freshwater species, and can be either cartilaginous or bony
Electric fish are a small minority of all fishes, but they are diverse, including both oceanic and freshwater species, as well as cartilaginous and bony fish. Electric organs, composed of electrocytes, allow these fish to produce electric fields. Electric organs are derived from modified muscle or nerve tissue, with the exception of the Apteronotus in Latin America, where the cells are derived from neural tissue. Electric organs are oriented along the length of the body in most electric fish, but in some marine groups, like stargazers and torpedo rays, they are oriented along the dorso-ventral axis.
Electric fish use their electric fields for electrolocation, hunting, defence, and communication. Freshwater fish have high-voltage, low-current discharges, with numerous cells in series to overcome the large resistance of the medium. Electric eels, the most powerful of all electric fishes, can discharge at least 600 volts. In 2019, the electric eel genus was split into three species: Electrophorus electricus, Electrophorus voltai, and a third species with a similar body shape and coloration. Electrophorus voltai is the strongest bioelectricity generator in nature, capable of generating 860 volts.
The electric organ has evolved at least six times among the elasmobranchs and teleosts, providing evidence of convergent evolution. Charles Darwin discussed the electric organs of the electric eel and torpedo ray in his 1859 book On the Origin of Species, noting that if electric organs were inherited from one ancient progenitor, electric fishes would be more closely related to each other. However, this is not the case, suggesting independent evolution of electric organs.
The electric organ discharge process involves the fish's brain sending signals to release a neurotransmitter onto the electrocytes. This opens molecular doors for positively charged sodium ions to enter, creating an electric current. The voltage-gated sodium channels are regulated by calmodulin and calcium, and the organ is rich in sodium potassium ATPase, an ion pump creating a potential difference across cell membranes.
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Electric organs are made up of electrocytes, which are modified muscle or nerve cells
Electric fish are a small minority of all fish species, and they include both oceanic and freshwater species, as well as both cartilaginous and bony fishes. Electric organs in these fish are used to create an electric field, which is used for locating prey, defence against predators, and signalling, such as in courtship.
The electric eel is a well-known example of an electric fish. It was first described by Carl Linnaeus in 1766 and was given the name Gymnotus electricus, placing it in the same genus as the banded knifefish. Electric eels are now classified into three species, and they are known for their powerful electric shocks. The maximum discharge from their main organ is at least 600 volts, making them the most powerful of all electric fishes.
The evolution of electric organs has been a subject of interest for scientists, including Charles Darwin. In his book On the Origin of Species, Darwin discussed the electric organs of the electric eel and the torpedo ray as a likely example of convergent evolution. He noted that if electric organs had been inherited from a common ancestor, electric fishes would be more closely related to each other. However, this is not the case, suggesting that electric organs may have evolved independently in different species.
The electric organs of all electric fish are derived from skeletal muscle, an electrically excitable tissue, except in Apteronotus, where the cells are derived from neural tissue. Comparative transcriptomics have revealed that while there is no parallel evolution of entire transcriptomes of electric organs, there are a significant number of genes that exhibit parallel gene expression changes from muscle function to electric organ function.
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Electric organs produce strong electric fields, which are used for electrolocation, hunting, defence, and communication
Electric organs in fish are derived from modified muscle or nerve tissue, called electrocytes. Electric organs are made up of electrocytes, which are specialised cells that generate electricity. These organs have evolved at least six times among the elasmobranchs and teleosts. Electric fish produce their electrical fields from an electric organ, which is used for electrolocation, hunting, defence, and communication.
Electric organ discharges (EODs) need to vary with time for electrolocation, whether with pulses, as in the Mormyridae, or with waves, as in the Torpediniformes and Gymnarchus, the African knifefish. Electric fish use their electric discharges for navigation, communication, mating, defence, and in strongly electric fish also for the incapacitation of prey. Electric organ discharges are of two types: pulse and wave. They vary by species and function.
Weakly electric fish generate a discharge that is typically less than one volt. These are too weak to stun prey and are instead used for navigation, electrolocation, and electrocommunication with other electric fish. Active electrolocation is practised by two groups of weakly electric fish: the order Gymnotiformes (knifefishes) and family Mormyridae (elephantfishes), and by the monotypic genus Gymnarchus (African knifefish). In active electrolocation, fish generate a weak electric field and sense the different distortions of that field created by objects that conduct or resist electricity.
Strongly electric fish, such as the electric eel, locate prey by generating a weak electric field and then discharge their electric organs strongly to stun the prey. Other strongly electric fish, such as the electric ray, electrolocate passively. Electric catfish frequently use their electric discharges to ward off other species from their shelter sites. Electric catfish (Malapteruridae) have their electric organ forming a sheath around much of the body. Stargazers like Astroscopus y-graecum have the electric organ in the head, arranged vertically.
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Electric eels are the most powerful of all electric fishes, with a maximum discharge of at least 600 volts
Electric eels are a genus of neotropical freshwater fish from South America, known as Electrophorus. They are the most powerful of all electric fishes, with a maximum discharge of at least 600 volts, which can stun their prey. They are also capable of producing electric fields for navigation, communication, and defence. Electric eels have three pairs of electric organs, which are made up of electrocytes, modified muscle or nerve cells specialised for producing strong electric fields. These organs give electric eels the ability to generate both low- and high-voltage electric organ discharges.
The electric eel's ability to produce such powerful electric discharges has long been recognised, with early studies of the fish contributing to the invention of the electric battery in 1800. In the 19th century, Charles Darwin discussed the electric organs of the electric eel and the torpedo ray in his book 'On the Origin of Species', noting that they provided evidence for convergent evolution. More recently, in 2008, researchers designed artificial cells that could replicate the electrical behaviour of electric eel electrocytes, with the potential for greater output power density and more efficient energy conversion.
The electric eel's high-voltage discharges are possible due to the large quantity of electrocytes available in their electric organs. These electrocytes contain proteins, including actin and various forms of desmin, arranged in a loose network structure. The distribution of potassium channel proteins involved in electric organ discharge also differs between the eel's three electric organs, with most being most abundant in the main organ and least abundant in Sachs's organ, while KCNH6 is most abundant in Sachs's organ.
The electric eel's skin has a much higher electrical resistance than its prey, providing natural insulation. This means that electricity, which follows the path of least resistance, passes through the body of the eel's prey more readily than through the eel itself, allowing the eel to stun its prey without stunning itself. However, eels have been observed to curl up and thrash after delivering an electric shock, indicating that they do experience some shock themselves, but to a lesser extent.
Electric eels are sexually dimorphic, with males becoming reproductively active at a larger size than females. Adult eels provide prolonged parental care for their young, lasting up to four months. Electric eel species living in fast-flowing rivers, such as E. electricus and E. voltai, appear to make less use of parental care, with the male primarily providing protection for the young and the nest.
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The electric organ discharge starts when the fish's brain releases a neurotransmitter onto the electrocytes, creating an electric current
Electric fish, including both oceanic and freshwater species, produce electric fields from an electric organ. This organ is made up of electrocytes, which are modified muscle or nerve cells specialised for producing strong electric fields. Electric organ discharge is controlled by the medullary command nucleus, a nucleus of pacemaker neurons in the brain.
In most electric fish, the electric organs are oriented to fire along the length of the body, usually along the tail and within the fish's musculature. However, in some species, such as stargazers and torpedo rays, the electric organs are oriented along the dorso-ventral axis. Electric organs have evolved at least six times in various teleost and elasmobranch fish, with some species using electric discharges for navigation, communication, mating, defence, and incapacitating prey.
The study of electric fish and their organs has a long history, dating back to Charles Darwin's work in the 19th century. Modern research has continued to explore the genetic and evolutionary aspects of these fascinating organisms, shedding light on their unique abilities to generate electric fields and their potential impact on species evolution.
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Frequently asked questions
Electric fish are a small minority of fish that can produce electric fields. They include both oceanic and freshwater species, and both cartilaginous and bony fishes.
Electric fish produce electricity through an electric organ, which is made up of electrocytes, or modified muscle or nerve cells. The electric organ discharge starts when the fish's brain sends signals that release a neurotransmitter onto the electrocytes. This creates an electric current.
Some examples of electric fish include electric eels, stargazers, torpedo rays, and elephantnose fish. Electric eels are the most powerful of all electric fishes, with a maximum discharge of at least 600 volts.
Electric fish use their electricity for various purposes, including locating prey, defence against predators, and signalling in courtship. Some electric fish are also able to deliver electric shocks powerful enough to stun their prey or repel predators.
