Abstract
The log quantum relative spectral sensitivity of Neon Tetra [ Paracheirodon innesi (Myers)] was determined under photopic conditions. Each wavelength was equated to a standard white light. A sideways tilt, due to the dorsal light reaction, was an index of the imbalance of the two light stimuli, white and monochromatic, on opposite sides of the fish. The intensity of the monochromatic light was changed in 0.25 log unit steps. At each intensity level the direction of tilt of the fish was judged as either towards or away from the monochromatic light by a method of forced choice, and the matching intensity was found by interpolation. The mean of results from the four fishes agreed best with the absorption spectrum of a typical A 2 pigment λ max 535 . though the results from the fourth fish were better fitted by λ max 547 .
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