The hardening process of the egg chorion of the cod, Gadus morhua L., and lumpsucker, Cyclopterus lumpus L.
When transferred to sea water the chorion of cod and lumpsucker eggs harden, reaching a resistance of about 150 and 2000 g respectively. In sea water this hardening process is independent of fertilization. Studies of eggs kept in artificial sea water with various ionic compositions indicated, in the...
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Language: | English |
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1984
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crwiley:10.1111/j.1095-8649.1984.tb04821.x 2024-06-02T08:06:56+00:00 The hardening process of the egg chorion of the cod, Gadus morhua L., and lumpsucker, Cyclopterus lumpus L. Lönning, S. Kjörsvik, E. Davenport, J. 1984 http://dx.doi.org/10.1111/j.1095-8649.1984.tb04821.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1984.tb04821.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1984.tb04821.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Fish Biology volume 24, issue 5, page 505-522 ISSN 0022-1112 1095-8649 journal-article 1984 crwiley https://doi.org/10.1111/j.1095-8649.1984.tb04821.x 2024-05-03T10:43:22Z When transferred to sea water the chorion of cod and lumpsucker eggs harden, reaching a resistance of about 150 and 2000 g respectively. In sea water this hardening process is independent of fertilization. Studies of eggs kept in artificial sea water with various ionic compositions indicated, in the lumpsucker eggs, that a cortical reaction seems to be a prerequisite for the hardening process. Calcium is necessary for the reaction both in unfertilized and inseminated eggs, whereas hardening takes place in the absence of potassium, magnesium or sulphate. Addition of barium or strontium as a substitute for calcium only caused hardening in the presence of activating spermatozoa. Activating spermatozoa were also necessary for hardening of lumpsucker eggs kept in ovarian fluid, but such hardening only occurred if calcium and/or magnesium were added. The hardening of lumpsucker eggs was associated with profound changes in the thickness and surface appearance of the chorion. Article in Journal/Newspaper Gadus morhua Wiley Online Library Journal of Fish Biology 24 5 505 522 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
When transferred to sea water the chorion of cod and lumpsucker eggs harden, reaching a resistance of about 150 and 2000 g respectively. In sea water this hardening process is independent of fertilization. Studies of eggs kept in artificial sea water with various ionic compositions indicated, in the lumpsucker eggs, that a cortical reaction seems to be a prerequisite for the hardening process. Calcium is necessary for the reaction both in unfertilized and inseminated eggs, whereas hardening takes place in the absence of potassium, magnesium or sulphate. Addition of barium or strontium as a substitute for calcium only caused hardening in the presence of activating spermatozoa. Activating spermatozoa were also necessary for hardening of lumpsucker eggs kept in ovarian fluid, but such hardening only occurred if calcium and/or magnesium were added. The hardening of lumpsucker eggs was associated with profound changes in the thickness and surface appearance of the chorion. |
format |
Article in Journal/Newspaper |
author |
Lönning, S. Kjörsvik, E. Davenport, J. |
spellingShingle |
Lönning, S. Kjörsvik, E. Davenport, J. The hardening process of the egg chorion of the cod, Gadus morhua L., and lumpsucker, Cyclopterus lumpus L. |
author_facet |
Lönning, S. Kjörsvik, E. Davenport, J. |
author_sort |
Lönning, S. |
title |
The hardening process of the egg chorion of the cod, Gadus morhua L., and lumpsucker, Cyclopterus lumpus L. |
title_short |
The hardening process of the egg chorion of the cod, Gadus morhua L., and lumpsucker, Cyclopterus lumpus L. |
title_full |
The hardening process of the egg chorion of the cod, Gadus morhua L., and lumpsucker, Cyclopterus lumpus L. |
title_fullStr |
The hardening process of the egg chorion of the cod, Gadus morhua L., and lumpsucker, Cyclopterus lumpus L. |
title_full_unstemmed |
The hardening process of the egg chorion of the cod, Gadus morhua L., and lumpsucker, Cyclopterus lumpus L. |
title_sort |
hardening process of the egg chorion of the cod, gadus morhua l., and lumpsucker, cyclopterus lumpus l. |
publisher |
Wiley |
publishDate |
1984 |
url |
http://dx.doi.org/10.1111/j.1095-8649.1984.tb04821.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1984.tb04821.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1984.tb04821.x |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_source |
Journal of Fish Biology volume 24, issue 5, page 505-522 ISSN 0022-1112 1095-8649 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1095-8649.1984.tb04821.x |
container_title |
Journal of Fish Biology |
container_volume |
24 |
container_issue |
5 |
container_start_page |
505 |
op_container_end_page |
522 |
_version_ |
1800751941077172224 |