抄録
This paper examines the hypothesis that spectral cone types exhibit different retinomotor movements in response to monochromatic radiation and can thus be identified histologically in the retina. Red sea bream Pagrus major, 79-105mm in total length, were dark adapted in a glass aquarium, then exposed overhead to various intensities of white light and monochromatic stimuliwith peaks at 337, 368, 466, 551 and 609 nm. The retinae from fish from each stimulus were examinedhistologically and scored for thickness of the cone layer and the pigment layer relative to the total retinal thickness. The red sea bream tested showed retinomotor response to 368 nm but not to 337 nm, and therefore were considered sensitive to ultraviolet stimulus. As additional single cones were absent in the cone mosaic, UV perception by central single cones or twin cones was suggested. White light and three other monochromatic stimuli elicited the retinomotor movement of all single and twin cones. These results and similar data from the literature show that the light-adaptive retinomotor movement of different spectral cone types is triggered by light perception in rods and thus do not vary by wavelength of visual stimulus between 368 and 609 nm.
