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Miscellaneous features of electroreceptors in Gnathonemus petersii (Günther, 1862) (Pisces, Teleostei, Mormyrifores)
Peters, R.C.; Dénizot, J.-P. (2004). Miscellaneous features of electroreceptors in Gnathonemus petersii (Günther, 1862) (Pisces, Teleostei, Mormyrifores). Belg. J. Zool. 134(2/1): 61-66
In: Belgian Journal of Zoology. Koninklijke Belgische Vereniging voor Dierkunde = Société royale zoologique de Belgique: Gent. ISSN 0777-6276; e-ISSN 2295-0451, more
Peer reviewed article  
Available in  Authors 
Document type: Conference paper
Keywords
    Gnathonemus petersii
    Fresh water
Authors  Top 
  • Peters, R.C.
  • Dénizot, J.-P.
Abstract
    The cutaneous electrical activity of ampullary and tuberous electroreceptor organs of Gnathonemus petersii (Teleostei, Mormyriformes) was studied in seven specimens. The spontaneous activity levels of 38 ampullary primary afferents showed significant differences between individual fishes rather than between different loci within a single specimen. Spontaneous activity of ampullary electroreceptor organs is not constant, but depends on some unknown factor, e.g. occlusion of the ampullary opening or local accumulation of ions. Both under Saffan and Hypnodil anesthesia it proved possible to record ampullary primary afferent activity from anesthetized specimens. Ampullary organ activity is modulated by Electric Organ Discharges and by respiratory potentials. Respiratory potentials also modulate the cutaneous electrical activity ofmormyromasts. The ion composition of the water influences the cutaneous electrical oscillations of the Knollen organs.
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