Abstract
1. 1. Isolated photophores of the living bathypelagic fish Myctophum punctatum respond to train of weak (10–25 V) and short (2–5 msec) electrical stimuli applied at different frequencies (8–100/sec) by a luminus response. 2. 2. This response is characterized by a short emission latency time, the peak of light develops within about 2 sec after the beginning of the electrical stimulation: afterwards the light decreases to a constant level within about 8 sec. 3. 3. Stimuli of higher strength (60–75 V) and longer duration (8–16 msec) applied at different rates (1–100/sec) evoke brief flashes. 4. 4. The isolated supracaudal gland emits flashes in response to electrical stimulation whatever the strength and the duration of stimuli. 5. 5. The flash of the supracaudal gland differs from the flash of the isolated photophores in three respects: lower threshold, higher magnitude and longer duration.
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