Home General Physiology and Biophysics 2009 General Physiology and Biophysics Vol.28, No.3, p.276–282, 2009

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Founded: 1982
ISSN  1338-4325 (online)

Published in English

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General Physiology and Biophysics Vol.28, No.3, p.276–282, 2009

Title: Temporal analysis of electroretinographic responses in fishes with rod-dominated and mixed rod-cone retina
Author: Milena Milošević, Željka Višnjić-Jeftić, Ilija Damjanović, Miroslav Nikčević, Pavle Andjus and Zoran Gačić

Abstract: 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.

Keywords: Critical flicker frequency — Dogfish shark — Eel — Painted comber — Prussian carp
Year: 2009, Volume: 28, Issue: 3 Page From: 276, Page To: 282

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