Abstract
Similar to gas secretion into the swimbladder, some teleosts also exhibit ocular gas secretion to supply their thick and avascular retina with oxygen. The process in the eye, however, is complicated by the fact that the retina is supplied with arterial blood only indirectly through the pseudobranch, a reduced gill arch of still unknown function. Approaches for closer analysis of the physiological implications of this serial blood supply arrangement and the associated process of O2 release include complete unilateral vascular isolation of eye and/or pseudobranch while maintaining normal blood flow characteristics for undisturbed operation of the counter-current rete mirabile.
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