Facial sexual dimorphism in largescaled terapon Terapon theraps Cuvier, 1829, with special reference to geometric morphometry
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Authors
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R. K. Renjith
ICAR-Central Institute of Fisheries Technology
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A. K. Jaiswar
ICAR-Central Institute of Fisheries Education, Mumbai-400061
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S. K. Chakraborty
ICAR-Central Institute of Fisheries Education, Mumbai-400061
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A. T. Landge
ICAR-Central Institute of Fisheries Education, Mumbai-400061
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G. B. Sreekanth
ICAR-Central Institute of Fisheries Education, Mumbai-400061
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K. K. Ramteke
ICAR-Central Coastal Agricultural Research Institute, Old Goa-403402
Abstract
Facial sexual dimorphism of Terapon theraps Cuvier, 1829 was studied through geometric morphometric method.
Twenty-four landmark based morphometric distances, acquired from lateral side of head, were subjected to canonical
discriminant analysis (CDA) to understand facial sexual dimorphism in the species. Scatter plot of canonical factors
differentiated male and female based on measurements associated with jaws, opercle and pectoral fin. Discriminant
function analysis (DFA) described sexes with 28.76% error. The study showed that geometric morphometry based sexual
differentiation in fishes with no external characters is a promising tool.
Keywords: Geometric morphometry, Sexual dimorphism, Terapon theraps
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