Document Detail

Activity of long-wavelength cones under scotopic conditions in the cyprinid fish Danio aequipinnatus.
MedLine Citation:
PMID:  9373956     Owner:  NLM     Status:  MEDLINE    
In carp (Cyprinus) and goldfish (Carassius), long-wavelength cones are reported to be active under scotopic conditions. Using the electroretinogram (ERG), we tested another cyprinid fish, Danio aequipinnatus, which contains A1-based visual pigments and for which we had previously measured the spectral sensitivities of individual cones. Dark adaptation curves show a rod/cone break at about 45 min. When thoroughly dark-adapted, the spectral sensitivity function is broader than can be accounted for by self-screening of rhodopsin, but it can be modeled by an additive combination of rods and the 560-nm cones. Dim, red background light causes adaptation of rods and a broadening of the spectral sensitivity function, which can be simulated by increasing the proportion of cones in the model. Brighter red backgrounds adapt the 560-nm cones. Because of the effect of red adapting lights, the ERG evidence for the participation of long-wavelength cones close to visual threshold appears to be different in Danio than in the goldfish Carassius.
P van Roessel; A G Palacios; T H Goldsmith
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Publication Detail:
Type:  In Vitro; Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of comparative physiology. A, Sensory, neural, and behavioral physiology     Volume:  181     ISSN:  -     ISO Abbreviation:  J. Comp. Physiol. A     Publication Date:  1997 Nov 
Date Detail:
Created Date:  1998-01-07     Completed Date:  1998-01-07     Revised Date:  2014-07-21    
Medline Journal Info:
Nlm Unique ID:  8413199     Medline TA:  J Comp Physiol A     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  493-500     Citation Subset:  IM    
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MeSH Terms
Cyprinidae / physiology*
Dark Adaptation / physiology*
Goldfish / physiology
Photic Stimulation
Retinal Cone Photoreceptor Cells / physiology*
Retinal Rod Photoreceptor Cells / physiology
Rhodopsin / physiology
Species Specificity
Grant Support
Reg. No./Substance:

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