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General Physiology and Biophysics 2009 General Physiology and Biophysics Vol.28, No.3, p.276–282, 2009
General Physiology and Biophysics 2009 General Physiology and Biophysics Vol.28, No.3, p.276–282, 2009
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General Physiology and Biophysics Vol.28, No.3, p.276–282, 2009 |
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| 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. |
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| Keywords: Critical flicker frequency — Dogfish shark — Eel — Painted comber — Prussian carp | ||
| Year: 2009, Volume: 28, Issue: 3 | Page From: 276, Page To: 282 | |
| doi:10.4149/gpb_2009_03_276 |
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