[The electroretinogram of the dark-adapted intact carp Carpio cyprinus L. to color substitution].

Electroretinogram b-wave was studied in intact carp using instantaneous substitution of monochromatic stimulus for another one in the range of 404-681 nm. It was shown that the amplitude of the b-wave as a function of the wavelength was good approximated by the spectrum of a scotopic pigment (porphiropsin) with the absorbtion maximum near 530 nm. The amplitude of the b-wave recorded during alternation of different monochromatic stimuli was determined only by their intensity differences and the level of previous light adaptation.