The reproductive biology of the porbeage shark (Lamna nasus) in the western North Atlantic Ocean
Reproductive organs from 393 male and 382 female porbeagles (Lamna nasus), caught in the western North Atlantic Ocean, were examined to determine size at maturity and reproductive cycle. Males ranged in size from 86 to 246 cm fork length (FL) and females ranged from 94 to 288 cm FL. Maturity in male...
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ftoceandocs:oai:aquadocs.org:1834/31098 2023-05-15T17:06:29+02:00 The reproductive biology of the porbeage shark (Lamna nasus) in the western North Atlantic Ocean Jensen, Christopher F. Natanson, Lisa J. Pratt Jr., Harold L. Kohler, Nancy Campana, Steven E. 2002 application/pdf 727-738 http://hdl.handle.net/1834/31098 en eng http://fishbull.noaa.gov/1004/08jensen.pdf 0090-0656 http://hdl.handle.net/1834/31098 http://aquaticcommons.org/id/eprint/15246 403 2014-05-30 21:17:13 15246 United States National Marine Fisheries Service Biology Fisheries Management article TRUE 2002 ftoceandocs 2023-04-06T17:04:19Z Reproductive organs from 393 male and 382 female porbeagles (Lamna nasus), caught in the western North Atlantic Ocean, were examined to determine size at maturity and reproductive cycle. Males ranged in size from 86 to 246 cm fork length (FL) and females ranged from 94 to 288 cm FL. Maturity in males was best described by an inflection in the relationship of clasper length to fork length when combined with clasper calcification. Males matured between 162 and 185 cm FL and 50% were mature at 174 cm FL. In females, all reproductive organ measurements related to body length showed a strong inflection around the size of maturity. Females matured between 210 and 230 cm FL and 50% were mature at 218 cm FL. After a protracted fall mating period (September–November), females give birth to an average of 4.0 young in spring (April−June). As in other lamnids, young are nourished through oophagy. Evidence from this study indicated a one-year reproductive cycle and gestation period lasting 8–9 months. Article in Journal/Newspaper Lamna nasus North Atlantic IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications |
institution |
Open Polar |
collection |
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications |
op_collection_id |
ftoceandocs |
language |
English |
topic |
Biology Fisheries Management |
spellingShingle |
Biology Fisheries Management Jensen, Christopher F. Natanson, Lisa J. Pratt Jr., Harold L. Kohler, Nancy Campana, Steven E. The reproductive biology of the porbeage shark (Lamna nasus) in the western North Atlantic Ocean |
topic_facet |
Biology Fisheries Management |
description |
Reproductive organs from 393 male and 382 female porbeagles (Lamna nasus), caught in the western North Atlantic Ocean, were examined to determine size at maturity and reproductive cycle. Males ranged in size from 86 to 246 cm fork length (FL) and females ranged from 94 to 288 cm FL. Maturity in males was best described by an inflection in the relationship of clasper length to fork length when combined with clasper calcification. Males matured between 162 and 185 cm FL and 50% were mature at 174 cm FL. In females, all reproductive organ measurements related to body length showed a strong inflection around the size of maturity. Females matured between 210 and 230 cm FL and 50% were mature at 218 cm FL. After a protracted fall mating period (September–November), females give birth to an average of 4.0 young in spring (April−June). As in other lamnids, young are nourished through oophagy. Evidence from this study indicated a one-year reproductive cycle and gestation period lasting 8–9 months. |
format |
Article in Journal/Newspaper |
author |
Jensen, Christopher F. Natanson, Lisa J. Pratt Jr., Harold L. Kohler, Nancy Campana, Steven E. |
author_facet |
Jensen, Christopher F. Natanson, Lisa J. Pratt Jr., Harold L. Kohler, Nancy Campana, Steven E. |
author_sort |
Jensen, Christopher F. |
title |
The reproductive biology of the porbeage shark (Lamna nasus) in the western North Atlantic Ocean |
title_short |
The reproductive biology of the porbeage shark (Lamna nasus) in the western North Atlantic Ocean |
title_full |
The reproductive biology of the porbeage shark (Lamna nasus) in the western North Atlantic Ocean |
title_fullStr |
The reproductive biology of the porbeage shark (Lamna nasus) in the western North Atlantic Ocean |
title_full_unstemmed |
The reproductive biology of the porbeage shark (Lamna nasus) in the western North Atlantic Ocean |
title_sort |
reproductive biology of the porbeage shark (lamna nasus) in the western north atlantic ocean |
publishDate |
2002 |
url |
http://hdl.handle.net/1834/31098 |
genre |
Lamna nasus North Atlantic |
genre_facet |
Lamna nasus North Atlantic |
op_source |
http://aquaticcommons.org/id/eprint/15246 403 2014-05-30 21:17:13 15246 United States National Marine Fisheries Service |
op_relation |
http://fishbull.noaa.gov/1004/08jensen.pdf 0090-0656 http://hdl.handle.net/1834/31098 |
_version_ |
1766061627022508032 |