Light-adapted spectral sensitivity of the goldfish: A reflex measure

Light-adapted spectral sensitivity of the goldfish was measured using the dorsal light reaction--the reflexive tendency of fish to tilt their dorsal surface toward bright light. Subjects were placed between two 150[deg] extended monochromatic fields, one of which was always 532 nm. The angle of tilt toward or away from the 532 nm light was measured, and the relative intensities of the fields were adjusted until the fish did not tilt. Blind fish did not tilt at all, and fish without utricular otoliths tilted more than normal. The spectral sensitivity obtained using this method peaked near 600 nm and was shallow and broad. The results are similar to those of electrophysiological studies, but different from other behavioral studies.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/22775/1/0000330.pd