• Mitogenome recovered from a 19th Century holotype by shotgun sequencing supplies a generic name for an orphaned clade of African weakly electric fishes (Osteoglossomorpha, Mormyridae). (wikimedia.org)
  • With this sense, fish can detect and distinguish the electrical properties of the close environment, measure distance, perceive the 3-D shape of objects and discriminate objects according to distance or size and shape, irrespective of conductivity, thus showing a degree of abstraction regarding the interpretation of sensory stimuli. (uni-bielefeld.de)
  • Simultaneous analysis of five molecular markers provides a well-supported phylogenetic hypothesis for the living bony-tongue fishes (Osteoglossomorpha: Teleostei). (wikimedia.org)
  • 2022. Convergent Craniofacial Evolution and Biogeography of Weakly Electric 1 Mormyrids and Bonytongue Fishes (Osteoglossomorpha). (fishphylogeny.org)
  • Mormyrids communicate using pulse-type electric organ discharges (EODs) that are highly stereotyped and species-specific ( Hopkins, 1981 ). (elifesciences.org)
  • The electric sense of mormyrids is often regarded as an adaptation to conditions unfavourable for vision and in these fish it has become the dominant sense for active orientation and communication tasks. (uni-bielefeld.de)
  • However, this apparent deficiency seems well adapted to the fish catching their prey at a high speed: if later the fish had no possibility to correct an initial error then it is better to start slightly too slow in order to minimize the risk of overshooting the point of catch. (tierphysiologie-bayreuth.de)
  • In the weakly electric gymnotiform fish, Apteronotus leptorhynchus, the dorsolateral pallium (DL) receives diencephalic inputs representing electrosensory input utilized for communication and navigation. (nih.gov)
  • 2) Sexual dimorphism of electrocommunication signals across populations of weakly electric fish, Apteronotus albifrons , with Dr. Troy Smith . (uconn.edu)
  • When the organ releases electricity this is called an electric organ discharge (or EOD for short). (wikipedia.org)
  • Two new species and a new subgenus of toothed Brachyhypopomus electric knifefishes (Gymnotiformes, Hypopomidae) from the central Amazon and considerations pertaining to the evolution of a monophasic electric organ discharge. (wikimedia.org)
  • Sudden electric discharge like eels is not helpful as it is just one-directional discharge and not a rather high-frequency oscillating signal - which is your requirement with 700MHz. (stackexchange.com)
  • Unlike the electric eel, ghost knifefish produce a wave-like electric organ discharge (EOD), which they use for navigation and electrolocation. (tropicalfishcafe.com)
  • The organism I studied, weakly electric fish, produce and receive electric organ discharges (EODs) used to electrolocate and communicate. (wustl.edu)
  • Weakly electrical species produce discharges of less than a volt, which are used to navigate and communicate within their underwater world. (tropicalfishcafe.com)
  • Seven methods of communication exist that can be used by animals to portray less abstract concepts such as mate finding, dominance establishment, territory defence, hunting and care: visual, auditory, olfactory, electric, touch, seismic and thermal. (spiegeloog.amsterdam)
  • This matching of motor and sensory spaces helps the fish to hunt prey efciently -particularly important given their energetically costly active sensory system. (tierphysiologie-bayreuth.de)
  • Archer fish can shoot down insect prey with a sharp jet of water. (tierphysiologie-bayreuth.de)
  • Archer fish live in groups and are renowned for their ballistic hunting technique in which they knock down stationary aerial insect prey with a precisely aimed shot of water [5- 7]. (tierphysiologie-bayreuth.de)
  • Here we report that these fish can learn to release their shots so as to hit prey that moves rapidly at great height, a remarkable accomplishment in which the shooter must take both the target's three-dimensional motion as well as that of its rising shot into account. (tierphysiologie-bayreuth.de)
  • Mormyrid fish are unique in that they have the ability to generate weak electric fields to detect prey and navigate in murky waters. (1o3.com)
  • They have a specialized organ called an electrocyte that produces an electric field, which they use to detect prey, communicate with other fish, and navigate in murky waters. (1o3.com)
  • For example, sharks possess specialized sensory organs called ampullae of lorenzini, which pick up electrical signals produced by muscle contractions in prey species but cannot produce their own electrical field. (tropicalfishcafe.com)
  • The thought of an electrical fish often conjures the image of the most infamous species, the electric eel (Electrophorus electricus), which uses its short, powerful shocks to incapacitate its prey. (tropicalfishcafe.com)
  • Within these electric organs are specialized cells known as electrocytes, which fire simultaneously when the eel is under threat or when it is attacking prey. (tropicalfishcafe.com)
  • Not all electrical species, however, use their capabilities for stunning their prey. (tropicalfishcafe.com)
  • The EODs of these nocturnal fish enable them to navigate and negotiate underwater objects in the gloom while hunting their prey. (tropicalfishcafe.com)
  • Examples of weakly electric fish are Peters' elephantnose fish or the black ghost knifefish . (wikipedia.org)
  • The black ghost knifefish is a distinctive-looking fish with a jet-black body and fins, bearing two white bands at the base of the tail fin and a white stripe that goes down the back of the head . (tropicalfishcafe.com)
  • The evolution of electroreception and bioelectrogenesis in teleost fish: a phylogenietic perspective. (wikipedia.org)
  • Beginning with my undergraduate studies, I have focused my research efforts on understanding these sorts of 'exotic' model systems, including studying active touch in manatees, echolocation in bats, and electroreception in weakly electric fish. (jhu.edu)
  • We here argue that electrical coupling - in addition to chemical synapses - may therefore contribute to the formation of at least some cell assemblies in adult animals. (degruyter.com)
  • By emitting a constant stream of EODs, the ghost knifefish can sense the presence of nearby objects and structures by using its electroreceptors to detect variations in the amplitude and timing of the electric fields. (tropicalfishcafe.com)
  • They also have a large caudal peduncle, which houses the electric organ that emits the continuous EODs. (tropicalfishcafe.com)
  • The habitats of these fishes are dominated by mud and/or sandy substrates, plant debris, marginal grasses, filamentous algae or clumps of aquatic plants, while the watercourse can be variable: there are species that inhabit barely torrential waters and others in basins where the water flow is high although with presence of pools and rocks that provide areas with lower streamflow. (wikipedia.org)
  • Paraqianlabeo lineatus , a new genus and species of labeonine fishes (Teleostei: Cyprinidae) from South China. (wikimedia.org)
  • Electrical fishes, which can be either electrogenic or electroreceptive, are able to generate their own bioelectric fields using a specialized electric organ, made up of modified nerve or muscle cells. (tropicalfishcafe.com)
  • Most of its species are sociable, and although their reproductive form is little known, they generally reproduce during the rainy season and their electrical organs transmit signals with the capacity to influence their reproductive and hormonal behavior. (wikipedia.org)
  • Electric communication signals are detected by electroreceptors called knollenorgans. (elifesciences.org)
  • Here we show that the voltage-gated calcium channel Ca V 1.3 and the big conductance calcium-activated potassium (BK) channel are preferentially expressed by electrosensory cells in little skate ( Leucoraja erinacea ) and functionally couple to mediate electrosensory cell membrane voltage oscillations, which are important for the detection of specific, weak electrical signals. (nature.com)
  • Like most other electroreceptive species, knifefish are most effective at sensing the electrical signals around them when their body is rigid. (tropicalfishcafe.com)
  • The Mormyroidea (synonymy: Mormyriformes) are a superfamily (formerly an order) of fresh water fishes endemic to Africa that, together with the families Hiodontidae, Osteoglossidae, Pantodontidae and Notopteridae, represents one of the main groups of living Osteoglossiformes. (wikipedia.org)
  • These fishes are distributed in various rivers, lakes, and swamps in Africa (south of the Sahara), the Nile, and the higher temperature sectors of South Africa, with an area of approximately 14 080 000 km². (wikipedia.org)
  • In 2003, Didier Paugy, Christian Lévêque, and Guy G. Teugels published a regional synthesis of West African fishes and identified a total of fifteen genera with 41 species in Lower Guinea and fourteen genera with 44 species in West Africa. (wikipedia.org)
  • Mormyrid fish are a family of freshwater fish found in Africa. (1o3.com)
  • Despite its common name, the electric eel is not a true eel but instead a species of knifefish with electric organs. (tropicalfishcafe.com)
  • Mormyrid fish are typically small, ranging from 2-20 cm in length. (1o3.com)
  • Mormyrid fish are omnivorous, feeding on a variety of small invertebrates, such as worms, crustaceans, and insect larvae. (1o3.com)
  • Mormyrid fish are popular in the aquarium trade, and are often kept as pets. (1o3.com)
  • The effects of anesthesia with etomidate on the cellular mechanisms of sensory processing and sensorimotor coordination have been studied in the active electric sense of the mormyrid fish Gnathonemus petersii. (uni-bielefeld.de)
  • Electrical Characterisation of Aδ-Fibres Based on Human in vivo Electrostimulation Threshold [med. (emf-portal.org)
  • The software gives a rapid, accurate and quantitative analysis of fish sperm quality based on spermatozoa motility, which can be a useful tool in aquaculture to improve reproduction success. (jove.com)
  • those that can detect electric fields are called electroreceptive . (wikipedia.org)
  • Elasmobranch fishes, including sharks, rays, and skates, use specialized electrosensory organs called ampullae of Lorenzini to detect extremely small changes in environmental electric fields. (nature.com)
  • Electroreceptive fishes are species that can detect the electrical fields given off by other animals but cannot produce their own. (tropicalfishcafe.com)
  • Northwestern and RIC researchers will discuss their pioneering work improving robotic arm control, providing sensation of a missing hand, developing neural prosthetics to help paralyzed people regain arm use, coordinating swarms of small robots, developing a robotic fish with bio-inspired sensing and motion capabilities, and translating robotics research into startup companies, among other topics. (northwestern.edu)
  • A recent study has shown that, unusually, both the sensory and motor capabilities of an electric fish are omnidirectional. (tierphysiologie-bayreuth.de)
  • That led us to devise our augmented reality system and see if we could experimentally perturb the relationship between the sensory and motor systems of these fish without completely unlinking them. (rdworldonline.com)
  • The duck-billed platypus also detects movement by an electric field. (wikipedia.org)
  • Kalmijn, A. J. Electric and magnetic field detection in elasmobranch fishes. (nature.com)
  • An expert in robotic devices that provide physical assistance, Brenna D. Argall , assistant professor of electrical engineering and computer science at McCormick and physical medicine and rehabilitation at RIC, is organizing a workshop bringing clinicians and roboticists together to identify the key challenges in rehabilitation and assistive robotics, collaborations for funding opportunities, benchmarks, and challenge problems for the field. (northwestern.edu)
  • In parallel, we studied the use of weakly ionizing electric field for aerosol disinfection. (cdc.gov)
  • Finding your way around murky freshwater rivers and lakes is no mean feat, even for a fish . (tropicalfishcafe.com)
  • There are more than 500 known freshwater and marine species of electrical fish. (tropicalfishcafe.com)
  • They stand out for their use of weak electric fields, which they use to orient themselves, reproduce, feed, and communicate. (wikipedia.org)
  • Viable cells, but not spores, are subject to inactivation, suggesting that weak electric fields applied to air filtration equipment may be an effective engineering technology for rapid inactivation of vegetative cells on low-pressure drop filter media. (cdc.gov)
  • We've known for a long time that these fish will follow the position of their refuge, but more recently we discovered that they generate small movements that reminded us of the tiny movements that are seen in human eyes," said Fortune. (rdworldonline.com)
  • Electrical fishes are adept at adaptation, being capable of hunting, navigating, and communicating within difficult environments. (tropicalfishcafe.com)
  • The term Mormyriformes derives from Greek mormyros, μορμύρος, μόρμυρος, a species of fish that would probably be Lithognathus mormyrus, and from Latin forma, with the same connotation as the English form. (wikipedia.org)
  • Taking advantage of the electrosensory system, weakly electric fishes are a system in which spiking patterns are themselves the behaviorally relevant stimulus. (wustl.edu)
  • The study proposes the fish use a dual-control system for processing feedback from active sensing movements, a feature that may be ubiquitous in animals. (rdworldonline.com)
  • Electric imaging through active electrolocation: implication for the analysis of complex scenes", Biol Cybern , vol. 98, 2008, pp. 519-539. (uni-bielefeld.de)
  • Kalmijn, A. J. The electric sense of sharks and rays. (nature.com)
  • The findings report that subtle active sensing movements of a special species of weakly electric fish - known as the glass knifefish (Eigenmannia virescens) - are under sensory feedback control and serve to enhance the sensory information the fish receives. (rdworldonline.com)
  • The team created an augmented reality for the fish so they could observe how fish movements changed as feedback from the environment changed. (scienceblog.com)
  • According to Fortune, the study's results indicate that fish may use two control loops, which could be a common feature in how other animals perceive their surroundings - one control for managing the flow of information from active sensing movements, and another that uses that information to inform motor function. (rdworldonline.com)
  • These fish have a large brain and an unusual intelligence, they feed on benthic and allochthonous invertebrates, as well as some crustaceans found in marshy and sandy areas of rivers and lakes. (wikipedia.org)
  • The constant movement of fish that seems random is actually precisely deployed to provide them at any moment with the best sensory feedback they need to navigate the world, Johns Hopkins University researchers have found. (scienceblog.com)
  • Synaptic strength changes caused by STDP have been shown in optic tectum, visual cortex, hippocampus, and other brain regions in vitro across many organisms like fish, frogs, and mice. (wustl.edu)
  • Motion parallax in electric sensing. (uni-bielefeld.de)
  • and "open loop" experiments, whereby motion of the refuge is "replayed" to the fish as if from a tape recorder. (rdworldonline.com)
  • Fish usually fire from positions that are not directly below their target so that a dislodged insect falls ballistically with a horizontal velocity component. (tierphysiologie-bayreuth.de)
  • This experiment demonstrates that the phenomenon that we are observing is due to feedback the fish receives from its own movement. (rdworldonline.com)
  • Potentially high exposures may occur in recreational and subsistence anglers who consume fish from local contaminated waters. (cdc.gov)
  • The main goal of this procedure is to analyze fish sperm quality based on spermatozoa motility in order to contribute towards successful artificial fertilization. (jove.com)
  • The main route of exposure to PCBs in the general population is the consumption of contaminated foods, particularly fish, meat, dairy, and poultry, although PCB concentrations in food have decreased over time. (cdc.gov)
  • Inside the tank, the weakly electric fish hovered within a tube where they wiggled back and forth constantly to maintain a steady level of sensory input about their surroundings. (scienceblog.com)
  • To investigate, the researchers placed weakly electric fish inside an experimental tank with an artificial refuge enclosure, capable of automatically shuttling back and forth based on real time video tracking of the fish's movement. (rdworldonline.com)
  • Of these, seven have been described as distinct species for the first time - although in two cases this required inspection of specimens from historical collections, since eutrophication of lakes in the 20th century also led to the extinction of fish species in Central Switzerland. (pensoft.net)
  • Early colonizations explain the high species richness of syngnatharian fishes in the Indo-Pacific but morphological similarities persist across marine realms. (fishphylogeny.org)
  • An electric fish is a fish that can make electric fields . (wikipedia.org)
  • They cannot make electric fields, and are not called electric fish. (wikipedia.org)
  • In each case, the fish immediately increased or decreased their swimming to make sure they were getting the same amount of information. (scienceblog.com)
  • The initial speed of starting fish is slightly but systematically too slow and is increased later so that the fish arrive 20·ms earlier than expected and often make the catch on a higher than take-off speed. (tierphysiologie-bayreuth.de)
  • It is this large quantity of electrocytes present in the electric eel that enables the animal to produce short shocks of up to 600 volts. (tropicalfishcafe.com)
  • Elevated temperature induces cardiac remodeling in Nile perch, establishing mechanistic links between cardiac plasticity, metabolic performance and thermal tolerance in a fish faced with climate-change-related stressors. (silverchair.com)
  • Lissmann, H. W. & Machin, K. E. The mechanism of object location in Gymnarchus niloticus and similar fish. (nature.com)