ニシン卵の受精の研究 : II.精子の形態と二, 三の性質

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(1) The spermatozoon of the Pacific herring, Clupea pallasii, consists of a rounded head (1.5μ×2.0μ) and a middle piece (1μ in diameter) provided with a long slender tail (40μ in length)(Fig. 1). Haemocytometric count indicates that the number of spermatozoa in 1mm^3 of dry sperm is 0.8-1.0×10^3. (2) The mature spermatozoa of the herring, unlike those of most marine animals, are almost motionless even after they are shed in sea water, and remain alive there in for 2 days or more without losing the capacity for fertilization (Table 1). In isotonic Ringer's solution the spermatozoa behave in almost the same way as they do in sea water (Table 2). (3) When a drop of fresh dry sperm is mixed with sea water or with the Ringer's solution, the sperm show at first as a uniformly milky suspension. A number of small agglutinated masses of spermatozoa begin to appear 15 to 30 minutes later. In agglutination, the spermatozoa stick together by their heads (Fig. 2).
社団法人日本動物学会の論文
1957-05-15