魚体のコハク酸脱水素酵素に関する研究-V : 魚体におけるコハク酸脱水素酵素の分布と魚種による差異について

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Since succinic dehydrogenase is an important enzyme in the TCA-cycle, tricarboxylic acid cyde of KREBS, high activity of the enzyme in any tissues implies that they constitute very active organs in the metabolic oxidation-reduction system. The activity of succinic dehydrogenase of various fish was estimated by the colorimetric method1) using 2, 6-Dichlorophenolindo-o-chlorophenol. A remarkable activity of succinic dehydrogenase was found in the dark meat and liver of most fish studied. The activity of the enzyme was highest in the dark meat, being about 1-2 times as high as that in the liver, and 5-10 times the strength of that in the ordinary meat of the same sample of pelagic fish. The succinic dehydrogenase activity of the pelagic fish was higher than that of the other nonpelagic fish and fresh water fish. The E-values for the pelagic fish were as follows; 100-40 in dark meat, 50-30 in liver, 25-15 in kidney, 16-8 in gill, and 10-5 in ordinary meat. The E-values for nonpelagic fish were as follows; 24-16 in liver, 14-2 in kidney, 13-1 in gill, and 5-1 in ordinary meat. These data indicate that oxydo-reductive metabolism is highly active in the dark meat and liver of pelagic fish. The high activity of the enzyme in these tissues may be intimately connected with the migratory habit of pelagic fish, undoubtedly.
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