抄録
On 57 samples detailed in Table 1, following treatments were made:
(1) Showing the relation between vitamin A concentration of liver and body-length in Fig. 1.
(2) Showing the relation between vitamin A concentration (vit. A poteney) of liver per unit body-weight and body-length in Fig. 2.
From Figures 1 and 2, it will be seen that vitamin A concentration of liver increases according to body-length, but there are more marked increase in females than in males.
More valuable facts I have drawn from Fig. 2 are as follows:
(i) There are no essential differences of vitamin A potency between male and female as shown in the max. -curve (A), min. -curve (C) and average-curve (B) respectively.
(ii) The lower potency of the male is merely due to its inferior size to which the adult could reach, compared to the female.
(iii) Seasonal fluctuation of vitamin A potency in the liver of the shark is deduced by calculating the distribution ratio of the points on both sides of the average curve (B) between the max. -curve (A) and the min. -curve (C), being shown in Table 2.
Table 3 showing the state of gonad say, before spawning, spawning stage, or after spawning, with respect to the month.
