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Electroretinographic evaluation of spectral sensitivity in yellow and silver eels (Anguilla anguilla)

Published online by Cambridge University Press:  01 May 1998

R.K. ANDJUS ,
I. DAMJANOVIĆ ,
Z. GAČIĆ ,
DJ. KONJEVIĆ  and
P.R. ANDJUS
R.K. ANDJUS
Affiliation:
Biophysical Laboratory, Center for Multidisciplinary Studies, University of Belgrade, Belgrade, Yugoslavia
I. DAMJANOVIĆ
Affiliation:
Brain Research Laboratory, Institute for Marine Biology, Kotor, Yugoslavia
Z. GAČIĆ
Affiliation:
Biophysical Laboratory, Center for Multidisciplinary Studies, University of Belgrade, Belgrade, Yugoslavia
DJ. KONJEVIĆ
Affiliation:
Brain Research Laboratory, Institute for Marine Biology, Kotor, Yugoslavia
P.R. ANDJUS
Affiliation:
Department of Physiology and Biochemistry, School of Biology, University of Belgrade, Belgrade, Yugoslavia
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Abstract

Although differences in visual pigments between developmental stages of the European eel are well known, the expected differences in spectral sensitivity have not been demonstrated at the electrophysiological level. In fact, one past electroretinographic study led to the conclusion that in eels there is no change in scotopic sensitivity, with increasing sexual maturity. In the present experiments, electroretinograms (ERGs) were recorded from in situ eyecups of immobilized eels Anguilla anguilla (L.) caught in coastal running waters. It was shown that the ERG b-wave is as good an indicator of spectral sensitivity as the unmasked late receptor potential (LRP) which directly reflects the responsiveness of photoreceptors. Complete spectral-sensitivity curves, based on b-wave thresholds and on thresholds of LRP subsequently isolated by means of sodium iodate, have been obtained in the same eel. Using fitted amplitude-log intensity functions for threshold calculation, and two models for computer-assisted fitting of spectral-sensitivity curves, significant differences in λmax were found between yellow and silver developmental stages of the eel, identified by ocular index measurements.

Keywords

ElectroretinogramsEuropean eelSpectral sensitivity
Type
Research Article
Information
Visual Neuroscience , Volume 15 , Issue 5 , May 1998 , pp. 923 - 930
Copyright
1998 Cambridge University Press

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