Abstract
1. 1. Respiratory control has been studied in the facultative airbreathing goby Gillichthys mirabilis. 2. 2. Fish gulped in oxygenated water when CO 2 was greater than 65 ml/l., and when less than 5 ml/l. if gills were infected with parasites. 3. 3. Injections of acetylcholine, ligation of gill arteries and CO saturated water did not cause gulping or stopping of opercular movements. 4. 4. Sudden decreases in external oxygen concentrations caused opercular stoppage. 5. 5. Fish gulped at progressively higher oxygen concentrations and at higher consumption rates as they were consecutively stressed. 6. 6. The rapidity of the gulping response in deoxygenated water was related to the rate at which oxygen consumption decreased before gulping.
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