魚類におけるヒスチジン代謝-V. : コイ肝臓のヒスチジンデアミナーゼおよびウロカナーゼ活性におよぼす低たんぱく餌料投与および絶食の影響

概要

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1. Distribution of histidine deaminase and urocanase in various tissues of carp was examined. High histidine deaminase activity was found in the liver, and low activity in the kidney and spleen but not in the heart and muscle. Urocanase activity in the liver tissue was higher than that in the kidney. 2. Carp fed on 5% casein diet for 2 weeks gave the low levels of liver histidine deaminase and urocanase, compared with the fish on 80% casein diet. Supplementation of 2.7% of histidine to the low protein diet caused the appreciable elevation of both the enzyme levels. 3. Liver histidine deaminase and urocanase of carp fasting for 2 weeks showed the higher activities per unit weight than those of the fish on the high protein diet but there were no differences in the activities of whole liver tissue between these fish.