On the Seasonal Variations of the Liver Weight and Oil Content of the Mackerel

The seasonal variations of the liver weight, oil content, and vitamin-A unite of the Mackerel caught in TAJIMA was observed. 1) Both the liver weight and oil content were affected by the nutrition of the kind of the feed and physiological influence of the reproduction. 2) The liver weight of the female was very increased in time of the period of egg-formation and rapidly consumed by the spawning, but in the male the liver weight does not change so remarkablly. 3) In February, the low unite of V-A was shown in spite of the low content of liver oil, that is seemed by the effect of the difference of feed.