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On the occurrence of the bluntnose sixgill shark, Hexanchus griseus (Chondrichthyes: Hexanchidae), in the Sea of Marmara

Published online by Cambridge University Press:  26 May 2009

Hakan Kabasakal
Hakan Kabasakal*
Affiliation:
Ichthyological Research Society, Atatürk mahallesi, Menteşoğlu caddesi, İdil apt., No: 30/4, Ümraniye, TR-34764 İstanbul, Turkey
*
Correspondence should be addressed to: H. Kabasakal, Ichthyological Research Society, Atatürk mahallesi, Menteşoğlu caddesi, İdil apt., No: 30/4, Ümraniye, TR-34764 İstanbul, Turkey email: hakankabasakal@superposta.com
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Abstract

Field surveys and literature review revealed the capture of 50 bluntnose sixgill sharks from the Sea of Marmara. Total lengths of the observed specimens ranged from 1.2–6 m, and weighed between 10 and 1000 kg. Nine specimens were males, 23 were females and 18 were of unknown sex. Regarding the bathymetric distribution of the captured bluntnose sixgill sharks, majority of the specimens (78%) were recorded in slope and shelf waters of the eastern and northern Sea of Marmara. Fishing presents the only known proximate threat to bluntnose sixgill shark populations in Marmaric waters. Inclusion of Hexanchus griseus in the endangered marine fish list of the Turkish Fisheries Act, would be the first step before subjecting H. griseus to 100% protection.

Keywords

bluntnose sixgill sharkHexanchus griseusSea of Marmaraoccurrenceconservationfishing pressure
Type
Research Article
Information
Marine Biodiversity Records , Volume 2 , January 2009 , e110
Copyright
Copyright © Marine Biological Association of the United Kingdom 2009

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