アユの成長に及ぼす溶存酸素の影響について

概要

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Experiments were carried out to examine the effect of dissolved oxygen on the growth of young ayu (body weight 2.0-8.0g). Fish were reared for 8days in 5 different tanks. Each of these tanks had a volume of 16 litres. These tanks were continuously supplied with freshwater having different dissolved oxygen concentrations. Reduced oxygen concentrations were maintained by bubbling nitrogen gas through the inflowing water. During the experiments water temperature ranged between 24 and 25°C. Fish were fed three times a day with commercially available, crumbled pellet for young ayu. Fish showed almost even levels of growth rate and feed conversion efficiency in water of 45% or more in percent oxygen saturation, while below 45% these levels decreased with the reduction of oxygen concentration. Growth rates and feed conversion efficiencies at the oxygen concentra-tion. Growth rates and feed conversion efficiencies at the oxygen concentrations of 27 and 35% in percent oxygen saturation were about 1/2 and 1/2-2/3 of those at the concentration of over 45%, respectively. However, the feeding rate reduced with the decrease in dissolved oxygen within the whole range of oxygen examined.
日本水産學會の論文