養殖ハマチの鰾容積

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Variations in swimbladder volume in cultured yellow-tail (Seriola quinqueradiata), fed on raw fish or a compounded diet, were investigated relatively to several conditions. The swimbladder volume was measured by the method described below. A small quantity of liquid paraffin was superimposed on a part of the swimbladder wall exposed by incising the abdominal wall. The gas in the swimbladder was collected by a syringe, airproofed with liquid paraffin, inserted through the paraffin layer. Total volume of the gas was determined as swimbladder volume at 1 atm. Relationship between swimbladder volume (S) and body weight (W) was negatively allometric and is represented as follows: S=0.0855W0.806 for the raw fish diet group, and S=0.0896W0.825 for the compounded diet group, showing that the swimbladder volume for the same body weight of a specimen was greater in the compounded diet group than in the raw fish diet group. Relative swimbladder volumes, namely ratio of swimbladder volume to body weight, was greatest in the early stages of growth, and later decreased with growth. Also it increased in the winter season, probably because of depletion of deposited fat consequent to fasting. There was a light diurnal variation in swimbladder volume, increasing in the night and decreasing by day time. Swimbladder volume declined rather rapidly following ingestion, and recovered to initial levels with progress in digestion. A reverse correlationship was observed between swimbladder volume and the amount of food content still remaining in the stomach. The phenomena observed have been discussed from the physiological and ecological perspectives.
日本水産學會の論文

養殖ハマチの鰾容積

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