A Cytological Study on the Maturation Division in the Oogenic Process of the Triploid Ginbuna (Carassius auratus langsdorfii)
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概要
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Cytological observations on the nuclei of the ripe egg cells just after spawing were carried out in two kinds of fishes, the kinbuna (<I>Carassius auratus</I> subsp.) and the ginbuna (<I>C.auratus langsdorfii</I>);both were collected from Kasumigaura.The egg cells of the kinbuna contained nuclei at metaphase of the second maturation division and had a first polocyte, while those of the ginbuna showed nuclei at metaphase of a single maturation division without a first polocyte.The mean diameter of the nuclear plates of 20 egg cells was 6.32 μ it for the kinbuna and it was 12.28 μ, a for the ginbuna.The nuclear plate in the ginbuna was twice larger than that in the kinbuna in diameter.Judged from Kobayashi et al. (1970), it is obvious that the ginbuna here used was triploid or tetraploid specimens and the kinbuna was diploid ones.<BR>The developmental process of the oocytes was carefully observed in the ovaries of two triploid lines of the ginbuna (offsprings from 3n ginbuna _??_).At the ripe egg stage, the majority of the oocytes contained metaphase nuclei derived from a single maturation division.Tripolar spindle formation at the first maturation division was not found in the present observation, contrary to the result in <I>Carassius auratus gibelio</I> by Cherfas (1966, 1972).<BR>Based on the present observations, it is considered that the triploid lines of the ginbuna are unisexual and may make triploid egg cells throughout a single homoeotype division during maturation period.
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