Author:
ANDJUS R.K.,DAMJANOVIĆ I.,GAČIĆ Z.,KONJEVIĆ DJ.,ANDJUS P.R.
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.
Publisher
Cambridge University Press (CUP)
Subject
Sensory Systems,Physiology
Cited by
17 articles.
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