性腺成熟期のクロアワビ雌雄おける54MnとMnの分布〔英文〕

概要

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Distribution of54 Mn in female and male tissues of black abalones was examined at the prespawning stage, and compared with that of stable-Mn. The ripeness of gonads was somewhat lower than fully developed condition, but a number of matured ovum and spermatozoon existed in the gonads. Distribution rates of 54Mn to conch were much less than those of stable-Mn and equal to both sexes; whereas in stable-Mn, the rate of the male is significantly higher than that of the female. It is inferred that two or more inner layer with organic matrices of conch were inactive to receive 54Mn, and that the radioactivity of conch resulted from the adsorption of 54Mn on its outermost rough surface mainly composed of conchiolin. The difference of the absolute amount percents for conchs between 54Mn and stable-Mn could be reasonably explained as the difference between exposure durations to the nuclides. When exposed to 54Mn, only in gonad, the intersexual difference was recognized with higher level in the ovary than in the spermary.
日本水産學會の論文