STUDIES ON THE PHYSIOLOGICAL CHEMISTRY OF PHOSPHORUS COMPOUNDS IN FISH MUSCLE-II:ON THE INDIVIDUAL AND REGIONAL VARIATIONS OF PHOSPHORUS COMPOUNDS CONTENTS IN FISH MUSCLE

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In the previous report, the author pointed out that the contents of various phosphorus com pounds in fish muscle showed such wide individual variations that it was very difficult to com-pare their contents among several fish species with each other. The present report deals with, by using gibel and mackerel, a special reference to whether the individual variations are caused by the difference among the innate characteristics of each fish or among the acquired factors such as environmental conditions and killing methods. The results are shown in Tables 1, 2, 3 and 4, and summarized as follows; 1) The innate individual variations of the phosphorus compound content in the same spe-cies were so small that it is concluded that the great variations found in the previous report were mostly due to the acquired factors. 2) The phosphorus compound content in muscle varied slightly but significantly according to the locality and kind of muscle, such as ordinary and dark muscles. Therefore it was point-ed out that specimens must be carefully prepared. 3) The values of XP/TP in the Tables clearly indicate that the ratio of organic phos-phorus compounds in muscle is higher in mackerel than in gibel, and this fact suggests that there is a difference in muscular function between these two fishes.
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