アユ卵の受精並びに發生に対する塩濃度の影響

概要

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1, When unfertilized eggs of Ayu (Plecoglossus altivelis) are immersed in tap water or nonelectrolyte solution without insemination, activation processes (breakdown of the cortical alveoli, membrane elevation and formation of the blastodisc) occur in the same manner as in other fishes, Oncorhynchus and Tribolodon, reported hitherto. However, these processes are retarded in Ringer's solution. These have already been reported by kanoh ('52). In this paper, the author deals with the effect of salt concentration upon the fertilization and development of the egg. 2. The eggs are inseminated by dry method and then put into isotonic (M/7) or hypertonic (M/4) Ringer's solution, then activation takes place gradually as in activated eggs without insemination. However, cleavage of the eggs is inhibited in many eggs. But a few of them develops into early cleavage stage, which disintegrates soon after. From the results of some experiments, these phenomena are interpreted as follows; the spermatozoon enters into the egg normally in Ringer's solution, but the cortical change, bipolar differentiation, karyokinesis and cleavage are retarded still more with increasing concentration of Ringer's solution, resulting the suppression of development.
社団法人日本動物学会の論文
1953-09-15