scholarly journals Gamma-Ray Irradiation on Primordial Germ Cells in Fish Oryzias latipes: Quantitative Assessment of Changes in Nuclear Size

1977 ◽  
Vol 18 (4) ◽  
pp. 293-301 ◽  
Author(s):  
KEN-ICHI IJIRI
Keyword(s):  
Germ Cells ◽  
Quantitative Assessment ◽  
Gamma Ray ◽  
Primordial Germ Cells ◽  
Oryzias Latipes ◽  
Nuclear Size ◽  
Gamma Ray Irradiation

Sex differentiation of germ cells in the teleost, Oryzias latipes, during normal embryonic development

Development ◽  
1972 ◽  
Vol 28 (2) ◽  
pp. 385-395
Author(s):  
Noriyuki Satoh ◽  
Nobuo Egami
Keyword(s):  
Germ Cells ◽  
Meiotic Prophase ◽  
Sex Differentiation ◽  
Primordial Germ Cells ◽  
Oryzias Latipes ◽  
The Other ◽  
Histological Structure ◽  
The Mean ◽  
Further Development ◽  
Normal Embryonic Development

Mitotic and meiotic activities of germ cells during early development in the medaka, Oryzias latipes, are dealt with in this report. Primordial germ cells were obviously distinguishable from somatic cells 3 days after fertilization and began to proliferate about 7 days after fertilization. The mean number of primordial germ cells increased during a period of 7–10 days after fertilization, reaching about 90 immediately before hatching. Newly hatched fry could be classified into two types according to the number and the nucleic activity of germ cells in the gonadal rudiment. One type consisted of fry containing about 100 germ cells and no cells in the meiotic prophase. In the other type of fry the number of germ cells increased by mitotic divisions and some of the cells began to enter into the meiotic prophase. During the course of further development the fry of the former type differentiated into males and the latter into females. Therefore it can be concluded that the morphological sex differentiation of germ cells occurs at the time of hatching. However, no sexual differences in the histological structure of somatic elements in the gonad are observable at that time.

scholarly journals Mutations affecting early distribution of primordial germ cells in Medaka (Oryzias latipes) embryo

2004 ◽  
Vol 121 (7-8) ◽  
pp. 817-828 ◽  
Author(s):  
Takao Sasado ◽  
Chikako Morinaga ◽  
Katsutoshi Niwa ◽  
Ai Shinomiya ◽  
Akihito Yasuoka ◽  
...  
Keyword(s):  
Germ Cells ◽  
Primordial Germ Cells ◽  
Oryzias Latipes
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