年齡形質としてのイセエビの第1觸角鞭状部について

概要

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The followings may be mentioned as the results taken by the present investigation. The differences of the length and the number of the segments of the flagella, due to right and left and due to sexes are denied within a per cent of risk (Tabs. 2-4). The length and number of the segments are in high correlation to body-length (Fig. 1), the correlation coefficients are 0.958 in length and 0.851 in number of the inner flagellum, 0.950 in length and 0.860 in number of the outer one, and 0.888 in number of the non-hair segments. The flagella appear to be avai-lable for age-determination of this lobster from puerulus to that of II-age, but to be useless for adult ones more than II-age, since the lengths and number of non-hair segments of inner and ou-ter flagella of the animal over II-age show no leap in relation to body-length. Finally it may be infered to be that the molt of this lobster per year takes place 10, 5, and 3 times for groups of I-age (20mm. long), II-age (93mm. long), and III-age (148-191mm. long) respectively. This result largely corresponds to those carried out by such workers : NAKAMURA(3), OSHIMA(5), and KUBO(2).
公益社団法人日本水産学会の論文