Fecundity and ovarian cycles of the Antarctic krill Euphausia superba (Crustacea, Euphausiacea)
The fecundity and ovarian cycles of Euphausia superba were studied using three approaches: (i) counting ovarian eggs at several stages of maturity; (ii) counting eggs spawned by individual animals in the laboratory; and (iii) observing the time sequence of ovarian changes by sequential sampling of a...
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Canadian Science Publishing
1982
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Online Access: | http://dx.doi.org/10.1139/z82-309 http://www.nrcresearchpress.com/doi/pdf/10.1139/z82-309 |
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crcansciencepubl:10.1139/z82-309 2023-12-17T10:21:21+01:00 Fecundity and ovarian cycles of the Antarctic krill Euphausia superba (Crustacea, Euphausiacea) Denys, C. J. McWhinnie, M. A. 1982 http://dx.doi.org/10.1139/z82-309 http://www.nrcresearchpress.com/doi/pdf/10.1139/z82-309 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 60, issue 10, page 2414-2423 ISSN 0008-4301 1480-3283 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 1982 crcansciencepubl https://doi.org/10.1139/z82-309 2023-11-19T13:38:35Z The fecundity and ovarian cycles of Euphausia superba were studied using three approaches: (i) counting ovarian eggs at several stages of maturity; (ii) counting eggs spawned by individual animals in the laboratory; and (iii) observing the time sequence of ovarian changes by sequential sampling of a laboratory-maintained population. Ovarian egg counts show that the number of eggs per female is directly proportional to body length and inversely proportional to the stage of maturity. Observations of laboratory-maintained animals indicate that spawning is biphasic, occurring in two closely spaced bursts. Maximum total yearly brood size for females 30–50 mm in length is estimated to be approximately 2200–8800 eggs and is directly proportional to body length. After spawning is complete, the ovary reorganizes and reverts to a juvenile appearance within 6 weeks. Reorganization is followed by a prolonged reproductive diapause. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Euphausia superba Canadian Science Publishing (via Crossref) Antarctic The Antarctic Canadian Journal of Zoology 60 10 2414 2423 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Denys, C. J. McWhinnie, M. A. Fecundity and ovarian cycles of the Antarctic krill Euphausia superba (Crustacea, Euphausiacea) |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
The fecundity and ovarian cycles of Euphausia superba were studied using three approaches: (i) counting ovarian eggs at several stages of maturity; (ii) counting eggs spawned by individual animals in the laboratory; and (iii) observing the time sequence of ovarian changes by sequential sampling of a laboratory-maintained population. Ovarian egg counts show that the number of eggs per female is directly proportional to body length and inversely proportional to the stage of maturity. Observations of laboratory-maintained animals indicate that spawning is biphasic, occurring in two closely spaced bursts. Maximum total yearly brood size for females 30–50 mm in length is estimated to be approximately 2200–8800 eggs and is directly proportional to body length. After spawning is complete, the ovary reorganizes and reverts to a juvenile appearance within 6 weeks. Reorganization is followed by a prolonged reproductive diapause. |
format |
Article in Journal/Newspaper |
author |
Denys, C. J. McWhinnie, M. A. |
author_facet |
Denys, C. J. McWhinnie, M. A. |
author_sort |
Denys, C. J. |
title |
Fecundity and ovarian cycles of the Antarctic krill Euphausia superba (Crustacea, Euphausiacea) |
title_short |
Fecundity and ovarian cycles of the Antarctic krill Euphausia superba (Crustacea, Euphausiacea) |
title_full |
Fecundity and ovarian cycles of the Antarctic krill Euphausia superba (Crustacea, Euphausiacea) |
title_fullStr |
Fecundity and ovarian cycles of the Antarctic krill Euphausia superba (Crustacea, Euphausiacea) |
title_full_unstemmed |
Fecundity and ovarian cycles of the Antarctic krill Euphausia superba (Crustacea, Euphausiacea) |
title_sort |
fecundity and ovarian cycles of the antarctic krill euphausia superba (crustacea, euphausiacea) |
publisher |
Canadian Science Publishing |
publishDate |
1982 |
url |
http://dx.doi.org/10.1139/z82-309 http://www.nrcresearchpress.com/doi/pdf/10.1139/z82-309 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctic Krill Euphausia superba |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba |
op_source |
Canadian Journal of Zoology volume 60, issue 10, page 2414-2423 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z82-309 |
container_title |
Canadian Journal of Zoology |
container_volume |
60 |
container_issue |
10 |
container_start_page |
2414 |
op_container_end_page |
2423 |
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1785533321217835008 |