Abstract
Typhlogobius californiensis, a small fish living in tide pools, was exposed to 24–36 hr of hypoxia and instantly fixed by deep freezing. In freeze dried brain sections of hypoxic fish the capillary diameter increased 1.6 times and the % capillary area 2.4 times compared to normoxic controls. Since the average distance between open capillaries stayed constant the diameter increase accounted for the increase of capillary area. The fishes heart rate slows to 20% during hypoxia and does not overshoot on return to normoxia. The opercular frequency drops to 45%. The capillary dilatation may be important in surviving hypoxia and is discussed as an additional element of the diving response.
Published Version
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