1. 1.

    The treatment of isolated photophores of the epipelagic luminescent fish Porichthys notatus Girard with the glycolytic inhibitor iodoacetic acid (IAA) induces light production.

  2. 2.

    This luminescence is not significantly affected by the adrenergic antagonists phentolamine and propranolol.

  3. 3.

    The addition of pyruvate, phosphoenolpyruvate or glyceraldehyde 3-phosphate in saline suppresses the light response to IAA. D-Glucose, D-glyceraldehyde, and 2- and 3-phosphoglycerate have no inhibitory effects.

  4. 4.

    The luminescence of the photophores induced by KCN is inhibited by D-glucose, D-glyceraldehyde 3-phosphate and 3-phosphoglycerate. In contrast, 2-deoxy-D-glucose, pyruvate, phosphoenolpyruvate, D-glyceraldehyde and 2-phosphoglycerate do not affect this light production.

  5. 5.

    These results confirm the view that glycolysis and oxidative phosphorylation are essential metabolic pathways in the photogenic cells. They further indicate that common products of these tightly associated metabolic pathways may regulate the activity of the luminous system in these cells.

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