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First approach to the biology of the deep-water shark Deania profundorum (Chondrichthyes: Centrophoridae)

Published online by Cambridge University Press:  05 March 2009

Ricardo Sousa ,
Sara Ferreira ,
Tomás Chada ,
João Delgado  and
Dalila Carvalho
Ricardo Sousa*
Affiliation:
Direcção de Serviços de Investigação das Pescas (DSIP), Estrada da Pontinha, 9004-562 Funchal, Madeira, Portugal
Sara Ferreira
Affiliation:
Direcção de Serviços de Investigação das Pescas (DSIP), Estrada da Pontinha, 9004-562 Funchal, Madeira, Portugal
Tomás Chada
Affiliation:
Direcção de Serviços de Investigação das Pescas (DSIP), Estrada da Pontinha, 9004-562 Funchal, Madeira, Portugal
João Delgado
Affiliation:
Direcção de Serviços de Investigação das Pescas (DSIP), Estrada da Pontinha, 9004-562 Funchal, Madeira, Portugal
Dalila Carvalho
Affiliation:
Direcção de Serviços de Investigação das Pescas (DSIP), Estrada da Pontinha, 9004-562 Funchal, Madeira, Portugal
*
Correspondence should be addressed to: Ricardo Sousa, Direcção de Serviços de Investigação das Pescas (DSIP), Estrada da Pontinha, 9004-562 Funchal, Madeira, Portugal email: [email protected]
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Abstract

This is the first work describing some biological aspects of the arrowhead dogfish, Deania profundorum. The specimens were captured in two surveys (2004–2005) between 151 and 1200 m off the Madeira archipelago (north-east Atlantic Ocean). A total of 351 females (36–110 cm) and 169 males (27–94 cm) were sampled. The smallest (27 cm) and the biggest (110 cm) specimens ever caught were recorded. Females were most abundant in the overall depths, apart from the middle range of 451–1050 m where the sex-ratio was 1:1. A vertical stratification by size occurred, since all the juveniles less than 40 cm length were caught deeper than 950 m. This species was sexually dimorphic with females growing to larger sizes than males and being larger at first maturity. All stages of maturity were found during the sampling period. Nineteen gravid females with six to 11 embryos (9–18 cm length) were found. The data obtained indicate that the Madeira slopes are a nursery and reproductive area for D. profundorum.

Keywords

Deania profundorumdeep-water sharkbiologyspawningfecundityMadeira
Type
Research Article
Information
Marine Biodiversity Records , Volume 2 , January 2009 , e44
Copyright
Copyright © Marine Biological Association of the United Kingdom 2009

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