Abstract
SUMMARYBy means of autoradiographic methods, after the injection of 3H-thymidine, a study has been made of the spermatogenesis of Asellus aquaticus (Crust. Isop.) in the period of winter reproductive stasis and during the period of normal reproduction, in order to determine whether the reproductive stasis somehow takes place at the level of spermatogenesis by creating a block in the maturation of the male germinal cells or by slowing down the spermatogenetic cycle. The comparative study of indiduals in stasis and individuals not in stasis has revealed a substantial identity of results. The time that elapses between the injection of the radioactive precursor and the appearance of labeled sperms is 19 days in both types. A small number of nurse cells incorporate the 3H-thymidine very quickly and continue to be labeled to the same degree even after 30 days.
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