Autoradiographic studies of yolk nucleus in fish oocytes

1961 ◽  
Vol 17 (3) ◽  
pp. 120-121 ◽  
Author(s):  
H. C. Chopra
Keyword(s):  
Yolk Nucleus ◽  
Fish Oocytes

The Yolk Nucleus of Fish Oocytes

1964 ◽  
Vol s3-105 (71) ◽  
pp. 353-358
Author(s):  
R. P. NAYYAR
Keyword(s):  
Cell Membrane ◽  
Comparative Study ◽  
Peripheral Region ◽  
Lipid Granules ◽  
Yolk Nucleus ◽  
Fish Oocytes

A comparative study of the yolk nucleus in the oocytes from 8 species of fishes has been carried out. The yolk nucleus appears as a mass of lipid granules and mitochondria situated beside the nucleus. It becomes spherical, detaches itself from the nucleus, and migrates to the peripheral region of the cytoplasm to lie just below the cell membrane. During the migration, the lipid granules of the yolk nucleus grow and move out of this organelle. When the oocyte is about 180 µ in diameter, the yolk nucleus breaks up and its components are dispersed in the cytoplasm. No differences have been found in the morphology of the yolk nucleus in the species under investigation.

Memoirs: On the Early Stages in the Development of Flustrella hispida (Fabricius), and on the Existence of a "Yolk Nucleus" in the Egg of this Form

1906 ◽  
Vol s2-50 (199) ◽  
pp. 435-478
Author(s):  
R. M. PACE
Keyword(s):  
Cell Lineage ◽  
Cell Stage ◽  
Single Row ◽  
Early Stages ◽  
Yolk Nucleus ◽  
Foregoing Paper

The main points in the foregoing paper maybe summarised as follows : (1) A "yolk nucleus" of the type described by Bambeke, as occurring in the egg of Pholcus, is present in the developing egg of Flustrella hispida. (2) Segmentation and cell-lineage have been followed out in detail up to the 32-cell stage. (3) The formation of the endoderm has been traced. (4) The oral and aboral ectoderm are differentiated as early as the 16-cell stage, and remain quite distinct from that time onwards. (5) The ciliated ring of the larva is formed by the coalescence of several originally distinct rows of cells, and not by the hypertrophy of a single row. (6) A stomach, comparable to that of Alcyonidium, is present also in Flustrella.

Memoirs: On the Relation of the Mitochondria and Golgi Apparatus to Yolk-Formation in the Egg-Cells of the Common Earthworm, Lumbricus Terrestris

1925 ◽  
Vol s2-69 (274) ◽  
pp. 291-316
Author(s):  
LESLIE A. HARVEY
Keyword(s):  
Golgi Apparatus ◽  
Nuclear Membrane ◽  
Lumbricus Terrestris ◽  
Yolk Formation ◽  
Central Mass ◽  
The Common ◽  
Yolk Nucleus ◽  
Earthworm Lumbricus

1. The yolk-nucleus is merely a mass of mitochondria. 2. The mitochondria arise as a cap of threads over the nucleus, and this cap grows in size and density, migrates away from the nuclear membrane and breaks up into its component mitochondrial threads. These threads become evenly spread throughout the cytoplasm of the cell. 3. The mitochondria are not clearly defined in the very young oogonia. 4. The Golgi apparatus consists of numbers of Golgi elements lying separate in the cytoplasm. There is never any attempt at concentration of these elements round one central mass. 5. The Golgi elements are probably little platelets or spheroids somewhat resembling blood corpuscles in shape. They are not rods. As fixed by Da Fano technique, each element is a little plate with a very lightly impregnating centre and a very heavily impregnating rim. 6. The Golgi elements may probably arise from the cytoplasm. 7. The nucleus contains two nucleoli; an early arising karyosome, homogeneous and solid in structure, and a plasmo some arising later This plasmosome is liquid in consistency and contains an argentophil core. The karyosome disappears before the oocyte is half grown, but the plasmosome remains in the nucleus while the egg remains in the ovary. 8. No visible nucleolar extrusions into the cytoplasm were observed. 9. Yolk probably arises from the cytoplasm; no direct metamorphosis of either mitochondria, Golgi apparatus, or nucleolus into yolk was observed.

scholarly journals Development of the Yolk Nucleus in the Oocytes of Some Fishes

Nature ◽  
1959 ◽  
Vol 184 (4700) ◽  
pp. 1746-1746 ◽  
Author(s):  
A. STOLK
Keyword(s):  
Yolk Nucleus

The reproductive cycle of the firetail gudgeon, Hypseleotris galii I. Seasonal histological changes in the ovary

1973 ◽  
Vol 21 (1) ◽  
pp. 53 ◽  
Author(s):  
NJ Mackay
Keyword(s):  
Breeding Season ◽  
Reproductive Cycle ◽  
Growth Phase ◽  
Steroid Biosynthesis ◽  
Histological Changes ◽  
Primary Growth ◽  
Fish Oocytes

Seasonal histological changes in the ovary of H. galii are described. Oogenesis occurs in January and February, at the end of the breeding season. Evidence suggests that oogenesis continues in senile (post-reproductive) fish. Oocytes in the primary growth phase grow throughout the winter months. Vitellogenesis commences in August, and fish mature by November. During the breeding season (November-January) females ovulate and spawn repeatedly. Mature oocytes remaining after the breeding season become atretic. The fate of follicular derivatives and their possible role in steroid biosynthesis is discussed.

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