Abstract
Marine fishes vary in their ability to remove dissolved O2 from sea water. Some species such as the toadfish can remove O2 at very low partial pressures; other spp. succumb from asphyxiation at much higher partial pressures. The sluggish forms seem to be more capable of removing O2 to low tension than active forms. The common mackerel seems unable to respire sufficiently unless it is moving forward. Ability to respire in a stationary position has been practically lost.

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