CONTENTS 



Page 



Review of the literature 1 



Capture, maintenance, and handling of stocks 2 



Measurement of dissolved oxygen 3 



Metabolic rate under various conditions 3 



Apparatus and general methods • 4 



Serial determinations of metabolic rate: 24-hour experiments 6 



Influence of temperature on rate of oxygen consumption , 8 



Influence of flow rate and numbers of fish upon the metabolic rate 8 



Discussion il 



Metabolic regulation in the iao 13 



Apparatus 14 



Relation between dissolved oxygen concentration and the rate of oxygen 



consumption of the iao 14 



Frequency of opercular movements in iao at different oxygen concentrations 15 



Discussion i& 



L/ethal values of oxygen 16 



Lethal values of oxygen for nehu and iao: experiments using single fish 18 



Lethal values of oxygen for iao: experiments using several fish 20 



Effect of temperature on lethal values of oxygen for iao 21 



Discussion 24 



Summary and conclusions 25 



Literature cited 27 



