Short CommunicationFirst documented southern transatlantic migration of a blue shark Prionace glauca tagged off South Africa
The first documented recapture of a South African-tagged juvenile blue shark Prionace glauca off Uruguay lends weight to the hypothesis of a single blue shark population in the South Atlantic. The presence of neonate blue sharks with umbilical scars and females with post-parturition scars, as well a...
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ftjafricanj:oai:ojs.ajol.info:article/62840 2023-05-15T17:33:20+02:00 Short CommunicationFirst documented southern transatlantic migration of a blue shark Prionace glauca tagged off South Africa da Silva, C Kerwath, SE Wilke, CG Meÿer, M Lamberth, SJ 2010-12-14 application/pdf http://www.ajol.info/index.php/ajms/article/view/62840 eng eng NISC http://www.ajol.info/index.php/ajms/article/view/62840/50748 http://www.ajol.info/index.php/ajms/article/view/62840 Copyright for articles published in this journal is retained by the publisher. African Journal of Marine Science; Vol 32, No 3 (2010) 1814-232X info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article 2010 ftjafricanj 2017-03-05T06:28:11Z The first documented recapture of a South African-tagged juvenile blue shark Prionace glauca off Uruguay lends weight to the hypothesis of a single blue shark population in the South Atlantic. The presence of neonate blue sharks with umbilical scars and females with post-parturition scars, as well as the high frequency of small juveniles in research longline catches, confirm the existence of a parturition and nursery area off South Africa. The final positions of three tagged sharks suggest that large-scale movement patterns in the South Atlantic are a mirror image of movements in the North Atlantic, with sharks using the north-westerly Benguela Drift to migrate into the tropics and ultimately across into South American waters. The confirmed existence of a parturition and nursery area off the south coast of South Africa and the movement of sharks into both adjacent ocean basins suggest that the southern African blue sharks are part of a single stock that straddles the South Atlantic and Indian oceans, and possibly the entire Southern Hemisphere.Keywords: blue shark, length frequency, migration, nursery area, Prionace glauca, South AtlanticAfrican Journal of Marine Science 2010, 32(3): 639–642 Article in Journal/Newspaper North Atlantic AJOL - African Journals Online Indian Uruguay |
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Open Polar |
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AJOL - African Journals Online |
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ftjafricanj |
language |
English |
description |
The first documented recapture of a South African-tagged juvenile blue shark Prionace glauca off Uruguay lends weight to the hypothesis of a single blue shark population in the South Atlantic. The presence of neonate blue sharks with umbilical scars and females with post-parturition scars, as well as the high frequency of small juveniles in research longline catches, confirm the existence of a parturition and nursery area off South Africa. The final positions of three tagged sharks suggest that large-scale movement patterns in the South Atlantic are a mirror image of movements in the North Atlantic, with sharks using the north-westerly Benguela Drift to migrate into the tropics and ultimately across into South American waters. The confirmed existence of a parturition and nursery area off the south coast of South Africa and the movement of sharks into both adjacent ocean basins suggest that the southern African blue sharks are part of a single stock that straddles the South Atlantic and Indian oceans, and possibly the entire Southern Hemisphere.Keywords: blue shark, length frequency, migration, nursery area, Prionace glauca, South AtlanticAfrican Journal of Marine Science 2010, 32(3): 639–642 |
format |
Article in Journal/Newspaper |
author |
da Silva, C Kerwath, SE Wilke, CG Meÿer, M Lamberth, SJ |
spellingShingle |
da Silva, C Kerwath, SE Wilke, CG Meÿer, M Lamberth, SJ Short CommunicationFirst documented southern transatlantic migration of a blue shark Prionace glauca tagged off South Africa |
author_facet |
da Silva, C Kerwath, SE Wilke, CG Meÿer, M Lamberth, SJ |
author_sort |
da Silva, C |
title |
Short CommunicationFirst documented southern transatlantic migration of a blue shark Prionace glauca tagged off South Africa |
title_short |
Short CommunicationFirst documented southern transatlantic migration of a blue shark Prionace glauca tagged off South Africa |
title_full |
Short CommunicationFirst documented southern transatlantic migration of a blue shark Prionace glauca tagged off South Africa |
title_fullStr |
Short CommunicationFirst documented southern transatlantic migration of a blue shark Prionace glauca tagged off South Africa |
title_full_unstemmed |
Short CommunicationFirst documented southern transatlantic migration of a blue shark Prionace glauca tagged off South Africa |
title_sort |
short communicationfirst documented southern transatlantic migration of a blue shark prionace glauca tagged off south africa |
publisher |
NISC |
publishDate |
2010 |
url |
http://www.ajol.info/index.php/ajms/article/view/62840 |
geographic |
Indian Uruguay |
geographic_facet |
Indian Uruguay |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
African Journal of Marine Science; Vol 32, No 3 (2010) 1814-232X |
op_relation |
http://www.ajol.info/index.php/ajms/article/view/62840/50748 http://www.ajol.info/index.php/ajms/article/view/62840 |
op_rights |
Copyright for articles published in this journal is retained by the publisher. |
_version_ |
1766131812473503744 |