Oogenesis in cod, Gadus morhua L., studied by light and electron microscopy
The development of the oocytes in the cod, Gadus morhua L., is described by light and transmission electron microscopy. The oocyte volume increases about 700 times during the stages preceding hydration. The size of the nucleoli increases 35‐fold, the cortical alveoli increase 6‐fold and the yolk gra...
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Language: | English |
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Wiley
1989
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Online Access: | http://dx.doi.org/10.1111/j.1095-8649.1989.tb03353.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1989.tb03353.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1989.tb03353.x |
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crwiley:10.1111/j.1095-8649.1989.tb03353.x 2024-06-02T08:06:55+00:00 Oogenesis in cod, Gadus morhua L., studied by light and electron microscopy Kjesbu, O. S. Kryvi, H. 1989 http://dx.doi.org/10.1111/j.1095-8649.1989.tb03353.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1989.tb03353.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1989.tb03353.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Fish Biology volume 34, issue 5, page 735-746 ISSN 0022-1112 1095-8649 journal-article 1989 crwiley https://doi.org/10.1111/j.1095-8649.1989.tb03353.x 2024-05-03T11:28:42Z The development of the oocytes in the cod, Gadus morhua L., is described by light and transmission electron microscopy. The oocyte volume increases about 700 times during the stages preceding hydration. The size of the nucleoli increases 35‐fold, the cortical alveoli increase 6‐fold and the yolk granules increase 70‐fold as the oocyte grows. The maximal number of yolk granules is nearly 100000 per oocyte; this number is reduced to less than the half prior to hydration. A significant reduction occurs also in the number of nucleoli at that time. The number of cortical alveoli increases steadily towards hydration. Yolk is deposited in the oocyte as crystalline granules. The lattice is broken down at hydration, leaving the egg transparent. Follicle cells go through a primordial stage and later change to a squamous and to a cuboids shape. The presence of lipid droplets in their interior and the virtual lack of interfollicular spaces are characteristic. The chorion grows to a tripartite structure: an outer thin porous layer, an intermediate homogenous layer and an inner thick helicoidally layer. A mucous substance covers the porous layer. The occurrence of the so‐called lamellae in the helicoidal layer is considered a function of the orientation of its micro fibrils and the plane of sectioning, i.e., not caused by alternating chemical arrangements. Article in Journal/Newspaper Gadus morhua Wiley Online Library Journal of Fish Biology 34 5 735 746 |
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Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
description |
The development of the oocytes in the cod, Gadus morhua L., is described by light and transmission electron microscopy. The oocyte volume increases about 700 times during the stages preceding hydration. The size of the nucleoli increases 35‐fold, the cortical alveoli increase 6‐fold and the yolk granules increase 70‐fold as the oocyte grows. The maximal number of yolk granules is nearly 100000 per oocyte; this number is reduced to less than the half prior to hydration. A significant reduction occurs also in the number of nucleoli at that time. The number of cortical alveoli increases steadily towards hydration. Yolk is deposited in the oocyte as crystalline granules. The lattice is broken down at hydration, leaving the egg transparent. Follicle cells go through a primordial stage and later change to a squamous and to a cuboids shape. The presence of lipid droplets in their interior and the virtual lack of interfollicular spaces are characteristic. The chorion grows to a tripartite structure: an outer thin porous layer, an intermediate homogenous layer and an inner thick helicoidally layer. A mucous substance covers the porous layer. The occurrence of the so‐called lamellae in the helicoidal layer is considered a function of the orientation of its micro fibrils and the plane of sectioning, i.e., not caused by alternating chemical arrangements. |
format |
Article in Journal/Newspaper |
author |
Kjesbu, O. S. Kryvi, H. |
spellingShingle |
Kjesbu, O. S. Kryvi, H. Oogenesis in cod, Gadus morhua L., studied by light and electron microscopy |
author_facet |
Kjesbu, O. S. Kryvi, H. |
author_sort |
Kjesbu, O. S. |
title |
Oogenesis in cod, Gadus morhua L., studied by light and electron microscopy |
title_short |
Oogenesis in cod, Gadus morhua L., studied by light and electron microscopy |
title_full |
Oogenesis in cod, Gadus morhua L., studied by light and electron microscopy |
title_fullStr |
Oogenesis in cod, Gadus morhua L., studied by light and electron microscopy |
title_full_unstemmed |
Oogenesis in cod, Gadus morhua L., studied by light and electron microscopy |
title_sort |
oogenesis in cod, gadus morhua l., studied by light and electron microscopy |
publisher |
Wiley |
publishDate |
1989 |
url |
http://dx.doi.org/10.1111/j.1095-8649.1989.tb03353.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1989.tb03353.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1989.tb03353.x |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_source |
Journal of Fish Biology volume 34, issue 5, page 735-746 ISSN 0022-1112 1095-8649 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1095-8649.1989.tb03353.x |
container_title |
Journal of Fish Biology |
container_volume |
34 |
container_issue |
5 |
container_start_page |
735 |
op_container_end_page |
746 |
_version_ |
1800751914591191040 |