Seasonal reproduction, multiple spawning, and fecundity in northern krill, Meganyctiphanes norvegica , and Antarctic krill, Euphausia superba
Both northern krill, Meganyctiphanes norvegica, and Antarctic krill, Euphausia superba, release eggs seasonally in multiple spawning events. Fecundity estimates were determined based on counts of mature oocytes in the ovary of females in preserved field samples. Principal components analysis and all...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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2000
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Online Access: | http://dx.doi.org/10.1139/f00-165 http://www.nrcresearchpress.com/doi/pdf/10.1139/f00-165 |
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crcansciencepubl:10.1139/f00-165 2023-12-17T10:21:19+01:00 Seasonal reproduction, multiple spawning, and fecundity in northern krill, Meganyctiphanes norvegica , and Antarctic krill, Euphausia superba Cuzin-Roudy, Janine 2000 http://dx.doi.org/10.1139/f00-165 http://www.nrcresearchpress.com/doi/pdf/10.1139/f00-165 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 57, issue S3, page 6-15 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2000 crcansciencepubl https://doi.org/10.1139/f00-165 2023-11-19T13:38:57Z Both northern krill, Meganyctiphanes norvegica, and Antarctic krill, Euphausia superba, release eggs seasonally in multiple spawning events. Fecundity estimates were determined based on counts of mature oocytes in the ovary of females in preserved field samples. Principal components analysis and allometry were used to analyze the covariation of egg-batch size with female characteristics. In both krill species, egg-batch size scaled isometrically with ovarian weight but showed a positive allometry with body size. Predicted egg-batch size ranged from 200 to 4000 eggs for M. norvegica of 25.5-35 mm body length and from 1500 to 6000 eggs for E. superba of 36-55 mm. Allometric relationships can be used to predict annual fecundity from size structure data of krill populations. In this study, the effect of temperature on the duration of molting and spawning cycles was used to infer a number of reproductive cycles per year, taking into account climate and seasonal variation. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Euphausia superba Meganyctiphanes norvegica Northern krill Canadian Science Publishing (via Crossref) Antarctic Canadian Journal of Fisheries and Aquatic Sciences 57 S3 6 15 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Cuzin-Roudy, Janine Seasonal reproduction, multiple spawning, and fecundity in northern krill, Meganyctiphanes norvegica , and Antarctic krill, Euphausia superba |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Both northern krill, Meganyctiphanes norvegica, and Antarctic krill, Euphausia superba, release eggs seasonally in multiple spawning events. Fecundity estimates were determined based on counts of mature oocytes in the ovary of females in preserved field samples. Principal components analysis and allometry were used to analyze the covariation of egg-batch size with female characteristics. In both krill species, egg-batch size scaled isometrically with ovarian weight but showed a positive allometry with body size. Predicted egg-batch size ranged from 200 to 4000 eggs for M. norvegica of 25.5-35 mm body length and from 1500 to 6000 eggs for E. superba of 36-55 mm. Allometric relationships can be used to predict annual fecundity from size structure data of krill populations. In this study, the effect of temperature on the duration of molting and spawning cycles was used to infer a number of reproductive cycles per year, taking into account climate and seasonal variation. |
format |
Article in Journal/Newspaper |
author |
Cuzin-Roudy, Janine |
author_facet |
Cuzin-Roudy, Janine |
author_sort |
Cuzin-Roudy, Janine |
title |
Seasonal reproduction, multiple spawning, and fecundity in northern krill, Meganyctiphanes norvegica , and Antarctic krill, Euphausia superba |
title_short |
Seasonal reproduction, multiple spawning, and fecundity in northern krill, Meganyctiphanes norvegica , and Antarctic krill, Euphausia superba |
title_full |
Seasonal reproduction, multiple spawning, and fecundity in northern krill, Meganyctiphanes norvegica , and Antarctic krill, Euphausia superba |
title_fullStr |
Seasonal reproduction, multiple spawning, and fecundity in northern krill, Meganyctiphanes norvegica , and Antarctic krill, Euphausia superba |
title_full_unstemmed |
Seasonal reproduction, multiple spawning, and fecundity in northern krill, Meganyctiphanes norvegica , and Antarctic krill, Euphausia superba |
title_sort |
seasonal reproduction, multiple spawning, and fecundity in northern krill, meganyctiphanes norvegica , and antarctic krill, euphausia superba |
publisher |
Canadian Science Publishing |
publishDate |
2000 |
url |
http://dx.doi.org/10.1139/f00-165 http://www.nrcresearchpress.com/doi/pdf/10.1139/f00-165 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctic Krill Euphausia superba Meganyctiphanes norvegica Northern krill |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba Meganyctiphanes norvegica Northern krill |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 57, issue S3, page 6-15 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f00-165 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
57 |
container_issue |
S3 |
container_start_page |
6 |
op_container_end_page |
15 |
_version_ |
1785532862554963968 |