Studies on the stocks of some economically important marine fishes caught around Amakusa. VII. On the compositions of mantle length of three cuttle-fishes and their ages

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Abstract
We dealt with three cuttle-fishes, namely Sepioteuthis lessoniana Fèrussac, Loligo bleekeri Kefersteine and Loligo edulis Hoyle, at Tomioka, Amakusa, from September in 1946 to March in 1948, and obtained the following results. (1) The range of mantle length was generally narrower in female than in male, and large females could not be seen in those three species. (2) In S.lessoniana, we could seperate six age•groups from O-age to V-age from the distribution of mantle length and the fatness. In L. bleekeri, some age groups were also recognizable from them, but we could not determine their ages for the shortage of materials. With regard to L. edulis, four groups were observable in male from the distribution of mantle length, which are deemed to represent the different ages respectively, but such groups could not be divided in female.

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