Assessment of dimorphic growth of the cuttlefish Sepia pharaonis (Cephalopoda: Sepiidae) using cuttlebone markings from the south-eastern Arabian Sea

Vargheese, Sneha and Kathirvelpandian, A and Sajikumar, K K and Basheer, V S and Lal, Kuldeep Kumar (2020) Assessment of dimorphic growth of the cuttlefish Sepia pharaonis (Cephalopoda: Sepiidae) using cuttlebone markings from the south-eastern Arabian Sea. In: Marine Ecosystem Challenges & Opportunities (MECOS 3). Convenor, MECOS3, Kochi, pp. 96-97. ISBN 978-93-82263-37-1

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Abstract

The pharaoh cuttlefish Sepia pharaonis Ehrenberg, 1831, is one of the most important species exploited along the Eastern Arabian Sea. A study on the relationships between dorsal mantle length (DML) and number of cuttlebone septa (or chambers) and between total body weight and number of cuttlebone septa were carried out in S. pharaonis collected from the south-eastern Arabian Sea. The cuttlefish samples were collected from Cochin Fisheries Harbour (133 males and 67 females). Dorsal mantle length-at-chamber count and weight-at-chamber count were statistically higher in males than in females. The available literature suggests that females of S. pharaonis are heavier than males while males are found to attain greater ultimate lengths throughout the lifecycle. Literature also suggests that the rate of cuttlebone septum formation is the same in both sexes of Sepia species, however in the present study, S. pharaonis males have slightly higher growth rates than females (Fig. 1 & 2). The study indicates that there is considerable scope to use cuttlebone chamber counts as a means of determining actual age of cuttlefishes

Item Type:	Book Section
Uncontrolled Keywords:	Cephalopoda
Subjects:	Fish and Fisheries > Fish biology > age and growth Molluscan Fisheries > Cephalopods Molluscan Fisheries
Divisions:	CMFRI-Kochi > Marine Capture > Molluscan Fisheries Division Subject Area > CMFRI > CMFRI-Kochi > Marine Capture > Molluscan Fisheries Division CMFRI-Kochi > Marine Capture > Molluscan Fisheries Division Subject Area > CMFRI-Kochi > Marine Capture > Molluscan Fisheries Division
Depositing User:	Arun Surendran
Date Deposited:	04 Oct 2023 04:57
Last Modified:	04 Oct 2023 04:58
URI:	http://eprints.cmfri.org.in/id/eprint/17517

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