Oxygen consumption and luminescence of Maurolicus photophores stimulated by adrenalin.
1. Abdominal photophores isolated from Maurolicus muelleri freshly collected in the Strait of Messina show a stable oxygen consumption rate of 149.8 +/- 10.1 nmoles g-1 min-1 (N = 31). 2. In the presence of adrenalin (5 X 10(-4) mol/l), the photophores that did not luminesce showed a 78% decrease of the resting oxygen uptake. When the photophores did luminesce, the oxygen consumption never increased above the resting level, instead, it decreased at a different rate according to the amount of light emitted. 3. Photophores pretreated with MnCl2 (40 mM) and stimulated with adrenalin (5 X 10(-4) mol/l), showed a rapid and large emission of light associated with a significant increase of the oxygen consumption above the resting level. 4. The results are discussed with reference to the control mechanism of luminescence in mesopelagic and epipelagic fish.
D000818:Animals; D002118:Calcium / Q000378:metabolism; D002712:Chlorides; D004837:Epinephrine / Q000494:pharmacology*; D005399:Fishes; D008163:Luminescent Measurements; D008345:Manganese / Q000494:pharmacology; D017895:Manganese Compounds; D010101:Oxygen Consumption; D013997:Time Factors
D002712:Chlorides; D017895:Manganese Compounds; D008345:Manganese; C025340:manganese chloride; D002118:Calcium; D004837:Epinephrine