Department of Intellectual and Information Systems, Faculty of Engineering, Toyama University, Toyama, Toyama 930-8555, Japan
We measured the relative spectral sensitivities of monophasic and biphasic S-potentials in the light-adapted retina of the Japanese flounder, and compared them with spectral absorbances and sensitivities of green and blue cones, respectively. Furthermore, we found that the delay time of the depolarizing response of biphasic S-potential was longer than that of the hyperpolarizing responses of monophasic and biphasic S-potentials. Histologically, we found that the cone mosaic of the Japanese flounder is square and that it has no any accessory cones. We discuss the cone visual pigment of the Japanese flounder as well as the neural circuits of the cones and horizontal cells based on the above results.