Wiktor Wise
Electric fish have a special 'sixth sense' that allows them to perceive electrical stimuli and generate electric fields to locate prey and communicate with other fish. This ability, called electroreception, is used by fish to detect the electric fields or currents generated by other animals and inanimate objects. Electric fish can also produce weak electric currents, which they use for navigation and social communication. The electric sense was only discovered in 1961, but it has since been found among the most primitive orders of fishes. Electric fish represent an ideal system for making detailed links between the properties of neural circuits and their behavioral function, which can help researchers better understand how the human brain distinguishes self from other.
| Characteristics | Values |
|---|---|
| Type of electroreception | Passive electroreception, Active electroreception |
| Electric field generation | Passive electrolocation, Active electrolocation |
| Electric organs | Ampullae of Lorenzini, Knollenorgans, Mormyromasts |
| Electric field detection | Low-frequency stimuli, High-frequency stimuli |
| Electric field range | About one body length |
| Electric field strength | Less than 1 V |
| Electric field usage | Communication, Navigation, Prey location, Object recognition |
| Electric sense evolution | Evolved from mechanosensory lateral line organs |
| Electric sense species | Platypus, Catfish, Sharks, South American electric fishes, African electric fishes |
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What You'll Learn
- Electric fish use electroreception to detect weak electric currents or fields
- Electric fish use electroreceptors to sense distortions in their electric fields
- Electric fish use electroreception to locate prey
- Electric fish use electroreception to communicate with other fish
- Electric fish use electroreception to navigate their surroundings
Electric fish use electroreception to detect weak electric currents or fields
Electroreception is the ability to detect weak electric currents or fields. It is found in a number of vertebrate species, including fish, amphibians, and monotremes (egg-laying mammals). In fish, electroreceptors evolved from mechanosensory lateral line organs, which are used to detect water currents and are present in most species of fish. The electroreceptors of electric fish are specialised to detect electric fields or currents, which they use for navigation and social communication.
Passive electroreception relies on ampullary receptors such as ampullae of Lorenzini, which are sensitive to low-frequency stimuli below 50 Hz. These receptors have a jelly-filled canal leading from the sensory receptors to the skin surface. Passive electroreception is used to sense the weak electric fields generated by other animals, which are created by the activity of their nerves and muscles. It is also influenced by the opening and closing of the mouth and gill slits.
Active electroreception, on the other hand, involves the generation of weak electric fields by the animal itself, which it uses to detect distortions in the field caused by objects that conduct or resist electricity. This allows the fish to distinguish between conducting and non-conducting objects in its vicinity. Active electroreception typically has a range of about one body length and relies on tuberous electroreceptors, which are sensitive to high-frequency stimuli.
Electric fish use a combination of passive and active electroreception to navigate their environment and locate prey. They are particularly well-suited to ecological niches where vision is limited, such as in caves, murky water, or at night. The ability to detect electric fields provides these fish with a "'sixth sense'" that enhances their survival and adaptation capabilities.
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Electric fish use electroreceptors to sense distortions in their electric fields
Electric fish possess electroreceptors that help them sense distortions in their electric fields. These electroreceptors are highly sensitive to both low- and high-frequency stimuli, with a range of 50 Hz or lower, and 20-20,000 Hz, respectively. Electric fish use these electroreceptors for active electrolocation, which involves generating weak electric fields and detecting changes in these fields caused by objects that conduct or resist electricity. This ability is particularly useful for prey detection and predator avoidance.
The electroreceptors in electric fish have evolved from mechanosensory lateral line organs, which are also present in other fish and aquatic forms of amphibians. The lateral line system consists of an array of sensors called neuromasts, which are arranged in stripes along the length of the fish's body. These neuromasts contain polarized hair cells that are moved by the movement of the surrounding water, providing information about water movements and low-frequency vibrations.
There are two main types of electroreceptors found in electric fish: ampullary receptors and tuberous receptors. Ampullary receptors, such as the ampullae of Lorenzini found in sharks, are sensitive to low-frequency stimuli and have a jelly-filled canal leading from the sensory receptors to the skin surface. Tuberous receptors, on the other hand, are sensitive to high-frequency stimuli and have a loose plug of epithelial cells that couples the sensory receptor cells to the external environment.
Weakly electric fish, such as the South American gymnotiform knifefish and the African mormyriform fish, have evolved to possess both types of receptors. They can generate electric fields of less than 1 V and use their electroreceptors to discriminate between objects with different resistance and capacitance values, aiding in object recognition and prey location.
Overall, the electroreceptors in electric fish provide a highly specialized sensory system that allows these fish to navigate, communicate, and locate prey in their aquatic environment.
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Electric fish use electroreception to locate prey
The Gymnotiformes include the electric eel, which, besides the group's use of low-voltage electrolocation, is able to generate high-voltage electric shocks to stun its prey. Such powerful electrogenesis makes use of large electric organs modified from muscles. These consist of a stack of electrocytes, each capable of generating a small voltage; the voltages are effectively added together to provide a powerful electric organ discharge.
The platypus, a monotreme, also uses electroreception to locate prey. It has almost 40,000 electroreceptors arranged in front-to-back stripes along its bill. By making short, quick head movements called saccades, the platypus accurately locates its prey.
Sharks also use electroreception to locate prey. The source of sharks' electroreception lies around their snouts and lower jaws. The dots around a shark's mouth are the ampullae de Lorenzini that facilitate electroreception. These ampullae are filled with an electrically conductive jelly, with the bottoms lined with hair-like cells called cilia. Electrical currents travel through the jelly to the cilia, which respond to changes in nearby electrical currents.
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Electric fish use electroreception to communicate with other fish
Electric fish have the biological abilities to perceive electrical stimuli and generate electric fields, which is known as electroreception and electrogenesis. These abilities are used to locate and stun prey, with the former being particularly useful in ecological niches where vision is impaired, such as in caves, murky water, or at night. Electric fish can also use electroreception to communicate with other fish.
Electroreception is the ability to detect electric fields or currents. Electric fish, such as catfish and sharks, can detect weak electric potentials in the order of millivolts. They can also produce weak electric currents, which they use for navigation and social communication. Electric fish use electroreceptors to transduce electric signals into action potentials that are processed in the central nervous system. These electroreceptors are primarily located on the head, often near the mouth, and can extend several inches into the body of the fish.
In passive electrolocation, electric fish sense the weak bioelectric fields generated by other animals to locate them. These electric fields are generated by the activity of nerves and muscles, as well as by the ion pump associated with osmoregulation at the gill membrane. Passive electroreception relies on ampullary receptors such as ampullae of Lorenzini, which are sensitive to low-frequency stimuli below 50 Hz.
In active electrolocation, electric fish generate a weak electric field and sense distortions in that field created by objects that conduct or resist electricity. Active electrolocation is practised by weakly electric fish such as knifefishes and elephantfishes. These fish have tuberous electroreceptors that can encode small changes in the self-generated electric field, enabling them to locate objects within a distance of about a body length.
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Electric fish use electroreception to navigate their surroundings
Electric fish can be classified into two groups: weakly electric fish and strongly electric fish. Weakly electric fish, such as the Neotropical knifefishes (Gymnotiformes) and the African elephantfishes (Notopteroidei), can generate electric fields that are usually smaller than one volt (1 V). They use electroreception to navigate and find food in turbid water. Weakly electric fish can discriminate between objects with different resistance and capacitance values, which helps them identify objects. Active electroreception in these fish typically has a range of about one body length, and objects with electrical impedance similar to that of the surrounding water are nearly undetectable.
Strongly electric fish, such as the electric eel and the electric ray, use electroreception to locate prey by generating a weak electric field and then discharging their electric organs strongly to stun the prey. The electric eel, for example, uses low-voltage electrolocation for navigation and prey detection, but it can also generate high-voltage electric shocks to stun its prey.
The electroreceptors in electric fish are primarily located on the head, often concentrated near the mouth. They look like pits or pores from the surface but extend several inches into the body, fanning out from the snout. These electroreceptors are jelly-filled canals that lead from the sensory receptors to the skin surface. The electroreceptors in some fish, such as the African mormyrid Gnathonemus petersii, are tuberous electroreceptors known as knollenorgans and mormyromasts, which are sensitive to high-frequency stimuli.
Research has shown that electric fish can incorporate highly localized sensory input in egocentric navigation, which is useful when vision is impaired. For example, in a study by Jung and colleagues, an elephant-nose fish was able to rely primarily on self-generated information to navigate to a food target in a tank and locate a metal landmark near the target using its electric sense.
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Frequently asked questions
Electric fish use electroreception to detect electric fields or currents. They can produce weak electric currents to navigate and communicate with other fish. Electric fish can also use electroreception to detect objects by sensing the distortions in the electric field created by those objects.
Electrogenesis is the ability to generate electric fields. Electric fish use this ability to create their own electric signals, which enables them to actively probe their environment and locate prey.
Examples of electric fish include the African elephantnose fish, the South American Gymnotiformes, and the African Mormyriformes.
Electric fish use their electric sense to perceive their environment and locate objects in three dimensions. They can also use it to communicate with other fish and to navigate in the dark.
