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Temporal analysis of electroretinographic responses in fishes with rod-dominated and mixed rod-cone retina.
Milosevic, Milena; Visnjic-Jeftic, Zeljka; Damjanovic, Ilija; Nikcevic, Miroslav; Andjus, Pavle; Gacic, Zoran.
Afiliação
  • Milosevic M; School of Biology, University of Belgrade, Studentski trg 3, 11001 Belgrade, Serbia. milmi@bio.bg.ac.rs
Gen Physiol Biophys ; 28(3): 276-82, 2009 Sep.
Article em En | MEDLINE | ID: mdl-20037193
Photoreceptor content of fish retinas could be accessed by comparative electroretinographic (ERG) studies using flickering light stimuli that could separate rod-mediated vision where critical flicker frequency (CFF, frequency when the eye loses its ability to resolve individual light pulses) is usually less than 15 Hz from cone-mediated vision. Four fish species inhabiting different photic environments (small-spotted dogfish shark--Scyliorhinus canicula, eel--Anguilla anguilla, painted comber--Serranus scriba, Prussian carp--Carassius gibelio) were investigated. Dogfish shark b-wave amplitudes significantly decreased at low frequency of stimulation and CFF was reached at 3.2 Hz. A similar effect on the b-wave amplitude was observed in the eel, but CFF occurred at around 20 Hz. Conversely, b-waves of painted comber and Prussian carp remained unaltered under intermittent low-frequency stimulation, and CFFs were around 25 and 30 Hz, respectively. Additional support in accessing the receptor content of fish retinas was given by the characterization of the OFF-response (d-wave) after light adaptation. Monotonous time course of the b-wave dark adaptation indicated a rod dominated retina of the dogfish shark. Observed results indicate that the dogfish shark possesses preponderantly rod retina, that of the eel is rod-dominated, while Prussian carp and painted comber have cone-rich retinae.
Assuntos
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Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Retina / Células Fotorreceptoras Retinianas Bastonetes / Células Fotorreceptoras Retinianas Cones / Peixes Limite: Animals Idioma: En Revista: Gen Physiol Biophys Ano de publicação: 2009 Tipo de documento: Article
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Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Retina / Células Fotorreceptoras Retinianas Bastonetes / Células Fotorreceptoras Retinianas Cones / Peixes Limite: Animals Idioma: En Revista: Gen Physiol Biophys Ano de publicação: 2009 Tipo de documento: Article