Mandarin fish (Siniperca chuatsi) is a nocturnal piscivore. Feeding behavior experiments reveal the utilization of vision and lateral-line mechanoreception in the feeding behavior of the fish. Although both senses can work independently, mandarin fish will use visual cues first if possible. Lateral line is very important in the feeding behavior at night. The most important characteristics of visual cues of mandarin fish's prey is its motion and shape, and the color of the prey is useless in the feeding behavior of mandarin fish. The most important characteristics of lateral-line cues of the prey is its vibrations of low frequency. Electrophysiological and histological investigations of mandarin fish's eye show color blindness and low resolving power of its eye, but the retina is still sensitive to motion. Mandarin fish improves its photo-sensitivity, by abandonment of color vision and decrease in acuity, so as to be able to recognize motion and approximate shape of its prey in a very dim light. Electrophysiological and histological investigations of mandarin fish's lateral-line show well-developed head canal system in the fish, and the lateral-line of the fish is most sensitive to vibrations of several cycles per second, which is the main frequency component of the swimming prey fish of mandarin fish.