THE NORMAL BLOOD SUGAR OF THE TOADFISH

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Abstract
The blood sugar level in normal toadfish was determined by modified Folin and glucose oxidase methods. More than 1800 fish were used during five summers and one winter. In January and April, the blood sugar level was more than 100 mg% by both methods. The summer level was approximately 33 mg% (Folin) and 20 mg% (glucose oxidase). Significant daily fluctuations in the blood sugar level were found during the spawning period. The daily standard deviation was usually less than 10 mg%. The results suggest that the blood sugar is under a more efficient control system than was expected.

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