Abstract
1. 1. Rainbow trout, bluegill sunfish and brown bullhead catfish were subjected to gradual hypoxia. 2. 2. Heart rate, ventilation rate and routine oxygen consumption were measured. 3. 3. Trout increased ventilation depth, while bluegills showed increased ventilation rate under hypoxia. Bradycardia was common to all species. 4. 4. Trout and bluegills showed varying degrees of oxygen regulation. Catfish more closely resembled an oxygen conforming species.
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