1 0 0 0 OA キンギヨCarassius auratusの正常初期発生段階
- 著者
- 梶島 孝雄
- 出版者
- The Ichthyological Society of Japan
- 雑誌
- 魚類学雑誌 (ISSN:00215090)
- 巻号頁・発行日
- vol.8, no.1-2, pp.20-28, 1960-10-31 (Released:2010-06-28)
- 参考文献数
- 13
The normal developmental stages of the goldfish (Carassius auratus) has been described, a summary of which is as following table.Stage 1.-Unfertilized egg. (Fig. 1)Stage 2.-Fertilized egg. (30 minutes; Fig. 2)Stage 3.-2-cell stage. (1 hour; Fig. 3)Stage 4.-4-cell stage. (1 1/2 hours ; Fig. 4)Stage 5.-8-cell stage. (2 hours ; Fig. 5)Stage 6.-16-cell stage. (2 1/2 hours ; Fig. 6)Stage 7.-32-cell stage. (3 hours ; Fig. 7)Stage 8.-Morula stage. (3 1/2 hours ; Fig. 8)Stage 9.-High blastula. (4 hours ; Fig. 9)Stage 10.-Flat blastula. (5 1/2 hours ; Fig. 10)Stage 11.-Expanding blastula. (7 hours ; Fig. 11).Stage 12.-Early gasturula. (9 1/2 hours ; Fig, 12)Stage 13.-Middle gasturula. (11 hours ; Fig. 13)Stage 14.-Late gasturula. (13 hours ; Fig. 14)Stage 15.-Early embryonic shield. (15 hours ; Fig. 15)Stage 16.-Late embryonic shield. (18 hours ; Fig. 16)Stage 17.-Optocole develops. (21 hours ; Fig. 17)Stage 18.-Optic vesicle develops. (26 hours ; Fig. 18)Stage 19.-Optic cup and lens develops. (30 hours ; Fig. 19)Stage 20.-Tail bud stage. (33 hours ; Fig. 20)Stage 21.-Retinal pigmentation begins. (36 hours ; Fig. 21)Stage 22.-Melanophores first appear on embryo. (50 hours ; Fig. 22)Stage 23.-Heart pulsates, and circulation begins. (60 hours ; Fig. 23)Stage 24.-Pectoral fin bud appears. (80 hours ; Fig. 24)Stage 25.-Hatching. (100 hours ; Fig. 25)Stage 26.-Air bladder develops. (2 days after hatching ; Fig. 26)Stage 27.-Tail fin rays develop.(7 days ; Fig. 27)Stage 28.-Dorsal and anal fin rays develop.(3 weeks ; Fig. 28)
1 0 0 0 OA 倍数性ギンブナ雌の雄性ホルモンによる性の転換
The sex of triploid ginbuna (Carassius auratus langsdorfii) are all females, reproducing gynogenetically. The artificial sex reversal was carried out successfully by the oral treatment of methylteststeron for two months after hatching out. In the sex reversed triploid ginbuna, the processes of spermatogenesis from spermatogonia to the primary spermatocyte was similar with diploid males. But thereafter though in the diploid male two different types of nuclear plate in diameter were observed, in the triploid ginbuna it was observed only the same diameter of nuclear plate. From these observations, it was concluded that the first maturation division might be omitted in these males as in females. Further, the triploid males produced the unequal diameter and DNA contents of sperms. This might be caused by unequal nuclear division during meiosis. Artificial insemination of triploid female with the sperm of sex reversed triploid male, resulted in the all triploid females. The sperm of triploid male might be possess the ability to activate the egg of triploid female gynogenetically.