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Biol Bull 107: 247-259. (October 1954)
© 1954 Marine Biological Laboratory
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SECRETION OF GASES AGAINST HIGH PRESSURES IN THE SWIMBLADDER OF DEEP SEA FISHES I. OXYGEN DISSOCIATION IN BLOOD

P. F. SCHOLANDER 1 and L. VAN DAM 1

1 Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, and Lerner Marine Laboratory, Bimini, Bahamas

1. Oxygen dissociation curves at a P02 running from 0.2 to 140 atmospheres have been obtained from eight species of deep sea fishes, at a pH varying from 8.0 to 5.7 and at a CO2 tension from 0.03 to 10-20% of one atmosphere.

2. The Root effect in acidified blood could be demonstrated in some of these species even up to 140 atmospheres, inasmuch as part of the hemoglobin remained unsaturated. In other species full arterial saturation occurred, however, at pH 6 or lower, at oxygen tensions much lower than those existing in the swimbladder. Hence the Root effect is not the mechanism for the oxygen secretion in deep sea fishes. If oxygen is derived from oxyhemoglobin it must be unloaded by some mechanism as yet unknown.




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