. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 238 J. A. WARNER AND J. F. CASE 10 9 8 7 o ^ 4. 12345 DAYS FIGURE 3. The development of fluorescence in a non-luminescent Porichthys after feeding with Vargula. Each point represents the average of three isolated photophores measured three times. Vertical bars = standard deviation. Upper curve, Vargula fed; lower curve, unfed non-luminous fish. Fluorescence scale arbitrary with 10 approximately equal to the typical fluorescence of a southern Porichthys. Fluorescence induction Onset of photocyte fluorescence was followed in a
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 238 J. A. WARNER AND J. F. CASE 10 9 8 7 o ^ 4. 12345 DAYS FIGURE 3. The development of fluorescence in a non-luminescent Porichthys after feeding with Vargula. Each point represents the average of three isolated photophores measured three times. Vertical bars = standard deviation. Upper curve, Vargula fed; lower curve, unfed non-luminous fish. Fluorescence scale arbitrary with 10 approximately equal to the typical fluorescence of a southern Porichthys. Fluorescence induction Onset of photocyte fluorescence was followed in a non-luminescent fish after feeding with 361 mg of V. hilgendorfii. Little or no fluorescence was record- able spectrofluorometrically from isolated photophores before the third day post- feeding. Fluorescence increased markedly from the third to fifth days, when it exceeded the calibrated range of the instrument. During this period the control fish showed no significant amount of photophore fluorescence (Fig. 3). Dietary induction of luminescence None of 13 non-luminescent midshipman fish became luminescent when fed upon specimens of eight luminescent organisms sympatric with the Southern Cali- fornia midshipman, as noted in Tables II and III. The four survivors at the end of this experiment were fed approximately 300 mg each of Vargula hilgendorfii and all became capable of luminescence upon injection of noradrenaline. In a subsequent experiment, one 19-cm nonluminescent midshipman was fed 110 mg (dry weight; about 700 specimens) of Vargula tsujii and developed bright fluo- rescence and' bioluminescence, first noted 4 days after feeding. The ability to luminesce persisted in this fish until its death 120 days later. In this experiment a second nonluminescent, fish shared the same seawater as the induced fish but was fed beef liver. It developed neither fluorescence nor capacity to luminesce during the induction period for the specimen fed V'. tsujii. At the co
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