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Biological observations on the smallspotted catshark Scyliorhinus canicula (Chondrichthyes: Scyliorhinidae) off the Languedocian coast (southern France, northern Mediterranean)

Biological observations on the smallspotted catshark Scyliorhinus canicula (Chondrichthyes: Scyliorhinidae) off the Languedocian coast (southern Franc

Biological observations on the smallspotted catshark Scyliorhinus canicula (Chondrichthyes: Scyliorhinidae) off the Languedocian coast (southern France, northern Mediterranean)  
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The smallspotted catshark, Scyliorhinus canicula (Linnaeus, 1758) presents a wide Atlanto-Mediterranean distribution, being commonly captured off the Languedocian coast (southern France, northern Mediterranean). Production of egg capsules was observed throughout the year, except in September. Hepatosomatic index (HSI), gonosomatic index (GSI) and oviducosomatic index (OSI) significantly increased with size in both males and females. HSI reached the highest values in both sub-adult and adult specimens, reflecting the role of the liver in the gonadal production as well as in buoyancy, while GSI and OSI reached the highest values in adult females. HSI and GSI did not show significant monthly variations, suggesting that the reproductive activity occurred throughout the year in both males and females. This fact was enhanced in the females by the lack of significant monthly variations in OSI.
Published in 2008.
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