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Size, sex and reproductive biology of seven pelagic sharks in the eastern Arabian Sea

Published online by Cambridge University Press:  09 March 2016

Sijo P. Varghese ,
N. Unnikrishnan ,
Deepak K. Gulati  and
A. E. Ayoob
Sijo P. Varghese*
Affiliation:
Cochin Base of Fishery Survey of India, Kochangadi, Kochi – 682005, India
N. Unnikrishnan
Affiliation:
Cochin Base of Fishery Survey of India, Kochangadi, Kochi – 682005, India
Deepak K. Gulati
Affiliation:
Cochin Base of Fishery Survey of India, Kochangadi, Kochi – 682005, India
A. E. Ayoob
Affiliation:
Cochin Base of Fishery Survey of India, Kochangadi, Kochi – 682005, India
*
Correspondence should be addressed to:S.P. Varghese, Cochin Base of Fishery Survey of India, Kochangadi, Kochi – 682005, India email: [email protected]
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Abstract

Studies on reproduction in sharks are important for their management, since the attainment of sexual maturity has a substantial impact on their distribution, behaviour and biology. However, reproductive biology of large oceanic sharks is poorly studied in the Indian seas. In this study, the size structure, sex and maturity of pelagic thresher (Alopias pelagicus), bigeye thresher (A. superciliosus), oceanic whitetip shark (Carcharhinus longimanus), tiger shark (Galeocerdo cuvier), shortfin mako (Isurus oxyrinchus), longfin mako (I. paucus) and blue shark (Prionace glauca) in the eastern Arabian Sea are described based on 1449 specimens collected from gillnet-cum-longline landings at the Cochin fisheries harbour during 2013–2014. Sex ratios of sampled specimens were biased to males in pelagic thresher, bigeye thresher, tiger shark and blue shark, while females dominated in the specimens of oceanic whitetip shark. Females matured at greater lengths than males in all species except oceanic whitetip shark. Lengths at maturity for males were in the range of 189.05–286.56 cm, whereas those of females were in the range of 187.74–310.69 cm. Litter sizes of both the thresher shark species were always two, while in oceanic whitetip shark, litter size was 3–9 and 22–51 in tiger shark. Seasonal reproduction was noticed in oceanic whitetip shark and tiger shark. Pregnant females were not found in the blue shark, shortfin and longfin makos sampled during the study period. Reproductive aspects of pelagic thresher, bigeye thresher, oceanic whitetip shark, tiger shark, shortfin mako, longfin mako and blue sharks in the eastern Arabian Sea are generally consistent with earlier reports from other regions of the world's oceans. These preliminary findings should be useful to identify suitable management measures for the above shark species.

Keywords

length at maturitypelagic thresher (Alopias pelagicus)bigeye thresher (Alopias superciliosus)oceanic whitetip shark (Carcharhinus longimanus)tiger shark (Galeocerdo cuvier)shortfin mako (Isurus oxyrinchus)longfin mako (Isurus paucus)blue shark (Prionace glauca)
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 97 , Issue 1 , February 2017 , pp. 181 - 196
Copyright
Copyright © Marine Biological Association of the United Kingdom 2016 

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