ウグイの鼻あげと代謝活動

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  • ウグイ ノ ハナアゲ ト タイシャ カツドウ
  • Air-snapping Responses to Oxygen Lack and Metabolic Activities in the Japanese Dace, Tribolodon hakuensis GÜNTHER

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In pond-culturing of fish the air-snapping response on the water surface when fish were suffered from dispnoea is observed by fish-culturists as a noteworthy warning in respect of fish damaging. The present study was undertaken to obtain the relation between air-snapping responses and metabolic activities of fish under experimental conditions, using the Japanese dace, Tribolodon hakuensis as a test animal. The results are as follows. 1. Under conditions where fish were kept in still and self-contaminated water air-snapping rates and intensities were closely xelated with dissolved oxygen content in the water. Up to 38 mmHg (1.4 cc/l) in oxygen content fish did not air-snapped but when the value was less than 25 mmHg (0.9 cc/l) tney showed 100%, of air-snapping rate and when the value was fallen in 16mmHg (0.6 cc/l) for hours they were suffocated to death. 2. There were much more increases in pH, alkalinity, N-compounds and phosphates in the water during experiments. 3. When fish were gradually acclimated to critical oxygen content and fed once a day in the morning, the feeding levels were even retained about as high as those in normal conditions. But in consequence of feeding fish were drived in dispnoea with air-snapping. The higher values of air-snapping rates and intensities were observed in 2-8 hours after feeding. 4. Such conditions as previously mentioned caused a reduction in the oxygen consumption of fish to one-sixth of normal value and decreased the efficiency of food conversion.

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