Results 241 to 250 of about 2,047,095 (269)

Electric Fish, Electric Organ Discharges, and Electroreception

2007
A number of animal groups have evolved sensitivity to weak electric currents that are generated by sources outside the receiver. This allows them to detect other individuals and suitable prey. Other animal groups have evolved the capacity to generate electric pulses and a surrounding electric field, together with a central nervous system that analyzes ...
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Communicating with Electric Organ Discharges

1990
During his voyage to the Orinoco river around 1800, Alexander von Humboldt reported communal attack responses in electric eels, and their power to stun prey as large as horses and mules by electric discharges. (He knew about the then recent discoveries concerning the nature of electricity, in which strong electric fish, such as the electric eel, took ...
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Numerical Simulations of the Electric Organ Discharge of Weakly Electric Fish

1993
A model of a weakly electric fish was constructed with data taken from Apteronotus leptorhynchus, and the electric organ discharge was simulated using boundary element and finite element methods. Maps of the electric potential measured around a live fish were used to calibrate the model parameters and test the results.
Christopher Assad, Brian Rasnow, James M. Bower   +2 more
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Species differences in electric organs of mormyrids: Substrates for species‐typical electric organ discharge waveforms

Journal of Comparative Neurology, 1986
AbstractThe organization of electric organs is described for the mormyrid fishes from Africa. The electric organ's spike‐generating cells or electrocytes are wafer‐shaped cells with a special geometry that relates to the number of phases and polarity of their pulsatile electric organ discharge (EOD) waveform.
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Plasticity of the electric organ discharge: implications for the regulation of ionic currents

Journal of Experimental Biology, 1999
ABSTRACT Weakly electric fish emit electric organ discharges (EODs) to locate objects around themselves and for communication. The EOD is generated by a simple hierarchically organized, neurophysiologically accessible circuit, the electromotor system.
, Zakon, , Mcanelly, , Smith, , Dunlap, , Lopreato, , Oestreich, , Few   +6 more
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Modulations of Electric Organ Discharge and Representation of the Modulations on Electroreceptors

2011
Weakly electric fish can recognize object’s parameters, such as material, size, distance and shape, in complete darkness. The ability to recognize these object’s parameters is provided by electrosensory system of the fish. The fish generates electric field using its electric organ (EOD: electric organ discharge).
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Ontogeny of the electric organ discharge and the electric organ in the weakly electric pulse fish Brachyhypopomus pinnicaudatus (Hypopomidae, Gymnotiformes)

Journal of Comparative Physiology A: Sensory, Neural, and Behavioral Physiology, 1997
I recorded the electric organ discharges (EODs) of 331 immature Brachyhypopomus pinnicaudatus 6-88 mm long. Larvae produced head-positive pulses 1.3 ms long at 7 mm (6 days) and added a second, small head-negative phase at 12 mm. Both phases shortened duration and increased amplitude during growth.
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Effect of temperature on the discharge rates of the electric organ of some gymnotids

Comparative Biochemistry and Physiology, 1968
Abstract 1. 1. The discharge rates of the electric organs of six species of Gymnotidae, living in the Rio Negro, were between 60 and 1600/sec at 28°C—which was the surface temperature of the river—and had Q10-values of around 1·5. 2. 2. The lower and upper tolerated temperatures were 19–25° and 30–37°C, respectively.
P S, Enger, T, Szabo
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Temperature sensitivity of the electric organ discharge waveform in Gymnotus carapo

Journal of Comparative Physiology A: Sensory, Neural, and Behavioral Physiology, 2001
At the southern boundary of gymnotiform distribution in America. water temperature changes seasonally, and may be an environmental cue for the onset of breeding. In this study, we aim to describe the role of temperature upon electric organ discharge waveform in Gymnotus carapo, order Gymnotiformes, family Gymnotidae, and to analyze its interactions ...
J L, Ardanaz, A, Silva, O, Macadar
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Avoidance conditioning of the rate of electric organ discharge in mormyrid fish

Animal Behaviour, 1968
In Mormyrid fish the electric organ appears to discharge as a single unit, and the frequency of discharge is a simply quantifiable behavioural variable. Following a study showing that acceleration in discharge rate can be conditioned classically, demonstration of operant conditioning was undertaken using a yoked control procedure. For each pair of fish
F J, Mandriota, R L, Thompson, M V, Bennett   +2 more
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